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1.
Recently the term green infrastructure has come to shape professional and scientific debate, political strategies and practical approaches concerning green space development, particularly in urban areas. Actors from all fields of spatial development and planning are referencing this as an emergent approach, which is expected to have a considerable environmental and socio-economic impact. The wide and ubiquitous use of the term in planning debates fosters an impression of agreement in its definition and meaning. Yet several theoretical studies and manifold practical observations confirm a variety of definitions and meanings of this “new” approach in the scientific, political and practical arenas, ranging from simply a buzzword to a mature approach. Clearly, this confusion in meaning has a practical relevance for planning. It seems wise, therefore, to raise awareness and deepen our understanding of the different conceptions of the term green infrastructure. This paper aims to systematically analyse and clarify the contextual, geographical and temporal origins of green infrastructure, as well as its impact on rationales, semantic content and main purposes for spatial planning. To this end, a content analysis of relevant literature has been conducted to reveal the strands which influence the current debate as well as the application of green infrastructure in planning practice. These results are used to derive key statements as a foundation for further critical reflection and conscious application of the term green infrastructure within spatial planning. 相似文献
2.
While ecosystem services (ES) provided by green areas receive increased recognition, there is a shortage of knowledge on the role of blue spaces to contribute to the delivery of ES. The aim of this paper is to investigate ES provided by the urban floodplain of the Warta River in Poznań, Poland. To achieve this, we used a set of methods, including a field survey, spatial analysis, and analysis of source materials. The paper documents both the services of public interest, as well as ones that can be overlooked by the public due to their “hidden nature”. The results strengthen the idea that assessment of social and ecological benefits from urban floodplains should be conducted jointly to account for the different categories of ES. A complex exploration of the ES delivery may help to better weight the synergies and trade-offs between different management options and to tie the local needs with preservation the integrity and ecological stability of the whole river corridor. 相似文献
3.
Urban green infrastructure (UGI) planning, based on certain principles, has emerged as a way to conceptualise connected greenspace in urbanised environments. This is achieved through the application of processes and approaches linked to policy themes to which the concept can significantly contribute. Taken together the processes, approaches and policy themes constitute the principles of UGI, which when adopted can promote, maintain and enhance quality of life in resource-efficient, compact and climate-resilient cities. In this study we explore the extent to which strategic greenspace planning in Europe is UGI compliant, as we hypothesised that the above principles are presently under-represented in planning documents and policies. This was accomplished by conducting a comparative analysis of the adoption of UGI principles in current practices of greenspace planning across European city-regions based on a systematic review of previous data and reports. The study found that many UGI principles and related concepts are present to some degree in strategic greenspace planning in Europe. However, gaps exist with regard to their scope and level of consideration. Presently, conservation emerges as the predominant task in strategic urban greenspace planning. However, enhancing network connectivity is key to the development of UGI, hence a greater focus on the restoration and creation of greenspace is required in the future. Based on our analysis it can be concluded that the advancement towards UGI planning is well established and progressing, although some areas are markedly under-represented. Strategic greenspace planning in Europe, with a few exceptions, requires further development to be effectively considered as UGI compliant. 相似文献
4.
Urban green spaces and their role in the quality of life of residents have been studied across multiple disciplines, based on empirical measurements or qualitative studies – however, the relation, and its strength, between spatial indicators of urban green spaces and visitors’ perceptions of green spaces are less known. Addressing this knowledge deficit, the present research uses a Geographical Information System (GIS) to link subjective evaluations of the physical environment and objective spatial indicators, to examine the correlation between the perceived and objective characteristics of five urban parks in the city of Szeged, Hungary. A questionnaire survey was used to collect residents’ subjective perceptions of the parks, while objective – which is to say measurable and mappable – spatially explicit indicators of the respective green spaces were calculated using GIS. The subjective evaluations of the parks were matched to the objective indicators using a multiple regression analysis. The statistical analysis yielded two moderate and two minor correlations between the human perceptions of the investigated green spaces and the nine objective environmental indicators examined. These results showed that subjective evaluations and objective data reveal different aspects of the same reality. Therefore, the recommendations from this study are to collectively use human perceptions and objective environmental indicators, both of which are fundamental for adequately capturing the role of urban green spaces in quality of life. 相似文献
5.
The ecosystem services concept is increasingly considered as a policy tool to achieve the sustainable use of natural resources. However, it is still not sufficiently integrated into land use planning. We assessed five land use types (Tetraclinis articulata woodlands, Pinus halepensis plantations, Shrublands, Cereal-almond crops and Cactus groves) in a semiarid area of northern Morocco using empirical data on 17 ecosystem services whose weights were established by 67 stakeholders. The analysis included MCA and direct ranking of the five land uses. Three groups of stakeholders (scientists and managers, collaborators, and direct users of natural resources) were particularly concerned by water supply, protection against erosion and floods, soil fertility and food provision. Multi-criteria analysis showed that the three groups concurred in that Tetraclinis woodlands, crops and cactus fields were the most suitable land uses for the area, regarding ecosystem service provision. Direct ranking confirmed this tendency but showed some divergence between the three groups, as collaborators and users were more inclined towards crops and cactus. The integration of the ecosystem services concept in land use planning is needed to be more practical and easily perceived as a logical response to environmental exigencies and social aspirations. 相似文献
6.
The planting of riparian margins is a policy option for pastoral farmers in response to land use induced environmental issues such as declining water quality, stream bank erosion, and loss of aquatic and terrestrial habitat. We elicited the views and experiences as to pros and cons of planting riparian margins from two sets of dairy farmers from Taranaki, New Zealand: those who are or have planted riparian margins, and those who have not yet done so. Those farmers who have planted riparian margins identified 21 positive aspects of riparian margin plantings and 11 negative aspects of riparian margin plantings. Perceived benefits identified by this group include water quality, increased biodiversity, the provision of cultural ecosystem services, immediate direct benefits to farm management and the farm system, and in some instances increased productivity on-farm. In contrast, those farmers that had fenced but not planted their riparian margins did not consider that riparian margin plantings could add further benefits to that which could be achieved by excluding stock from waterways, and associated only negative perceptions with riparian margin plantings. Planting riparian margins is not cost neutral and will not deliver anticipated environmental benefits in every situation. However, we argue that riparian margin plantings are an important ecological infrastructure investment that needs to be captured within a wider policy framework, the benefits of which extend beyond the mitigation of a single negative externality generated by land use practices, such as nutrient loss, and contribute to a multifunctional landscape. 相似文献
7.
This paper assesses barriers to local biodiversity and ecosystem (BES) governance within cities, drawing on findings from an international expert survey encompassing 45 cities in 25 countries. BES is recognised as a key foundation for sustainable cities, yet current literature indicates that more clarity is needed on the factors which may undermine BES initiatives. Survey findings show broad agreement that officials in development sectors have inadequate BES knowledge, budgets for BES are insufficient, and planners in the locality lack knowledge about BES. Respondents not working for local governments were more likely to see policy change with administrations, budget limitations, and lack of expertise as barriers. Respondents for cities in less-developed countries agreed significantly more that there were harmful cultural activities, and were more concerned that inadequate consideration from governments at different scales and poor internal communication were barriers. Based on the findings, we suggest (a) a need to evaluate the effectiveness of collaboration both within government and between sectors; (b) the importance of building capacity within local government staff, both in techno-scientific knowledge and in engaging the policy landscape with this knowledge; and (c) the importance of further considering how BES conservation may relate to culturally meaningful practices. 相似文献
8.
China is facing huge environmental problems, with its current rapid rate of urbanization and industrialization causing biodiversity loss, ecosystem degradation, and land resources degradation on a major scale. To overcome management conflicts and secure ecosystem services, China has proposed a new ‘ecological redline policy’ (ERP) using ecosystem services as a way to meet its targets. By giving environmental policy redline status, China is demonstrating strong commitment in its efforts to tackle environmental degradation and secure ecosystem services for the future. This is already having impact, as the Chinese Ministry of Environmental Protection and the National Development and Reform Commission are prepared to work together to implement the new environmental policy. 相似文献
9.
Estimation of ecosystem service values is a hot area of research in ecological conservation and economics. However, the costs of these outputs are largely unknown. In this paper, we estimated the opportunity cost of water allocated to afforestation projects through mathematical modeling based on statistical data for all of China to provide support for restoration planning based on a fuller consideration of the true costs. To guide future ecological conservation and environmental policy development, we illustrate a neglected concept (ecosystem service costs) and use this concept to compare the ecological services provided by ecological restoration based on afforestation with those of restoration based on the conservation of natural vegetation using data obtained since 1949 in China. The results showed that afforestation and natural vegetation create annual costs related to use of the available water resources equal to 4800 and 3700 RMB ha−1, respectively, representing a water opportunity cost of 1100 RMB ha−1 for afforestation. This illustrates the rule that “there is no free lunch” for any service, including ecosystem services. Therefore, to support the development of more effective and sustainable environmental restoration policy, it will be necessary to evaluate the associated opportunity costs. 相似文献
10.
Community-based Forestry (CBF) is now a popular approach for landscape restoration, forest management, biodiversity conservation and support for rural livelihoods worldwide. The Himalayan country Nepal has been at the forefront of CBF for over four decades, with almost 40% of the total population directly involved in protecting and managing more than 32% of the country’s forested land. However, in the past, the focus of CBF in Nepal was the provision of goods for local subsistence, and there has been limited analysis of the role of CBF in providing ecosystem services (ES) from restored forest landscapes. Based on material drawn from a literature review and a stakeholders’ workshop, this paper analyses changes in Nepalese forest policies to provide a more holistic framework for CBF that provides a wider range of ES and to potentially underpin payments for ecosystem services in Nepal. The analysis indicates that Nepal’s forest policy and practices are still dominated by a narrowly conceived notion of forest management that does not accommodate the holistic concept of ES. The study illustrates that CBF provides many ES from local to global benefits as result of forest restoration. For example, timber, firewood, food, and water have local importance, while climate regulation, flood/erosion control, and habitat improvement have global importance. Many innovative cases are emerging in the long journey of CBF in Nepal that demonstrate more diverse management strategies, new forms of tenure rights and autonomy in institutional spaces. These can potentially provide a catalytic platform for the wider adoption of the ES framework in CBF regimes, in order to focus and reward forest management more directly for the provision of services such as water, biodiversity, climate regulation and recreation. Consequently, this study discusses the issues and challenges that are impeding the implementation of the ES concept in Nepal and suggests some ways forward. 相似文献
11.
Urban regions are important places of ecosystem service demands and, at the same time, are the primary source of global environmental impacts. Although there is broad agreement on the importance of incorporating the concept of ecosystem services into policy strategies and decision-making, the lack of a standardized approach to quantifying ecosystem services at the landscape scale has hindered progress in this direction. Moreover, tradeoffs between ecosystem services and the supply/demand ratio of ecosystem services in urban landscapes have rarely been investigated. In our paper, we present a method to quantify and map the supply and demand of three essential provisioning services - energy, food, and water - along the rural-urban gradient of the eastern German region Leipzig-Halle. This urban region has experienced significant socio-economic dynamics and land use changes since the German reunification in 1990. The results show that both the demand and the supply of ecosystem services changed considerably during the time span under consideration (1990-2007). We identified an increasing supply/demand ratio of food and water but a decreasing supply/demand ratio of energy. In addition, the pattern of ecosystem demands shows a levelling of rural-urban gradients, reflecting profound modifications of traditional rural-urban relationships. The changes of ecosystem service supply gradients are determined more by land use intensity, such as the intensification of agricultural production, than by land cover changes such as urban sprawl. The comparison of supply/demand ratios and rural-urban patterns of ecosystem services can help decision-makers in landscape management in striving for a sustainable balance between resource supply and demand. 相似文献
12.
This paper investigates the role played by different site characteristics in influencing people's choice of outdoor recreation destinations. Contrary to prior studies, our experiment accounts for a large diversity of eligible landscapes described using photomontages. We use a discrete choice experiment (DCE) proposing respondents to choose among hypothetical destinations described in terms of eight site characteristics. We study the trade-offs made by various profiles of respondents among those site characteristics, resulting in different destination choices. The DCE attributes are spatially explicit to represent recreational patterns in the form of site quality maps using Geographic Information Systems (GIS). We conclude by stressing implications of this research for tourism and land management policy-making in peri-urban environments. Interestingly, preferences for site characteristics vary significantly with the recreational activities that respondents engage in. Hikers and cyclists preferences should be particularly considered in future planning decisions. 相似文献
13.
Environmental quality preservation and nature conservation are complex land use planning problems, involving not only environmental aspects but also socio-economic and operational factors and represent ecosystem services of fundamental importance to human well-being, for health, livelihoods and survival. The present paper proposes a Multicriteria Spatial Decision Support System (MC-SDSS) development for the assessment of the environmental quality of the river basin of the Pellice river in the Province of Turin (Italy) with the objective of increasing awareness of environmental issues in the territorial planning phase. In order to fulfill this goal, the environmental quality issues were divided into two main aspects, “naturalness” and pressures”, which represent the strengths and the weaknesses of the territory. Different criteria were considered for each theme and were integrated into composite maps by a weighted linear combination of factors resulting from a focus group with several experts in different fields. The results of this approach generated a final suitability map of the study area. The map identifies some critical zones that need mitigation measures and highlights areas with high environmental quality which require future specific monitoring procedures and valorization actions. The application was performed by means of the IDRISI software. This paper is based on an integrated approach which facilitates the comprehension of complex phenomena and aims at exploring innovative MCDA models in the field of the environmental quality preservation assessment of territorial transformation. 相似文献
14.
In Brazil, the Forest Code requires landholders to maintain fixed-width buffers of native vegetation along watercourses – legally called Areas of Permanent Preservation (APPs). In 2012, agricultural activities started to be partially allowed in APPs, but only if best management practices on soil and water conservation are adopted and if a narrow buffer strip with native vegetation is restored adjacently to the watercourse. In this paper, we present a modeling framework to investigate the capacity of legal compliant APPs to supply watershed services (erosion control and stream bank stabilization) in a 2,200 ha watershed in São Paulo State, Brazil. Our results suggest that the narrower the riparian buffer the lower the control of soil erosion dynamic within APPs, and that riparian buffers smaller than 8 m can act as a source of sediments to streams. The adoption of best management practices can contribute to controlling soil erosion within APPs but the presence of native forests in the first 15 m is necessary to guarantee equivalent protection to streams when compared to APPs completely covered by forests. Moreover, we observed that forest restoration within APPs helped to reduce the average soil loss of the watershed by only 20 %, compared to a reduction of 55 % when best practices are implemented in all watershed agricultural areas. We conclude that (i) the reduced requirements for APP restoration may contribute to stream sedimentation, which will likely affect the supply of watershed services by stream ecosystems; (ii) the implementation of best management practices in APPs will not have the same effect as native forests to reduce stream sedimentation; and (iii) the adoption of best management practices in all agricultural production areas – and not only within APPs as required by law – is the best strategy to promote the supply of watershed services to society. 相似文献
15.
This research develops the novel concept of an economic ecosystem service sustainability index from the perspective of total income theory, and presents its empirical application at the spatial unit scale of the agroforestry farm. This paper compares the results accrued from applying the refined standard System of National Accounts (rSNA) and the authors’ Agroforestry Accounting System (AAS). The AAS extends the rSNA to capture economic activities without manufactured production costs and substitutes the production cost valuations for exchange values revealed/stated by consumer willingness to pay for consumption of final products without market prices, the aim being to provide more comprehensive figures for total and environmental incomes of the agroforestry farms. Both accounting frameworks are applied to a case study of sixteen large, non-industrial, privately-owned holm oak dehesas (agroforestry farms) in Andalusia-Spain. This dehesa application provides estimates for the economic ecosystem service, total income factorial allocation, total capital and economic ecosystem service sustainability index for the aggregate and individual economic activities of the dehesa, distributed between accounts for the farmer and government institutional sector economic activities. The AAS explicit measurements of the hidden rSNA ecosystem services and environmental incomes of the dehesa allow us to further our scientific understanding of the current and future contributions of environmental income from nature to the total income of society as well as to provide information to the policy makers so that action can be taken to mitigate the depletion and degradation of environmental assets. This dehesa application reveals that environmental income measured by the AAS accounts for 67 % of total income in 2010. The dehesa AAS and rSNA ecosystem services share 34 % and 26 % of total product consumptions, respectively. Coupled with the AAS economic ecosystem service sustainability index of 0.5 and the rSNA economic ecosystem service sustainability index of 0.2, these figures indicate total product over-consumption in 2010. The dehesa case study shows that the AAS ecosystem services and environmental incomes are 2.5 and 8.4 times higher than those of the rSNA, respectively. Once the theoretic robustness of non-market product consumption simulated transaction value is accepted, as in the AAS methodology, the expected official economic ecosystem accounting framework will mainly depend on its ongoing standardization by the United Nations Statistical Division and implementation by individual governments. Thus, the challenge of standardizing and implementing such a framework is more closely linked to governmental policy measures than to the current scientific weakness of non-market product consumption valuations. 相似文献
16.
Forest ecosystems deliver valuable services to humanity. However, many forests are being degraded and their services have been undervalued. The main problem lies in the inadequate institutional arrangements for forest governance. This paper aims to assess the effects of alternative forest governance arrangements on the provision and economic values of forest ecosystem services (FES) in Vietnam. The study presents a framework for mapping land use and land cover (LULC) change stemming from actual and hypothetical changes in forest governance regimes, quantifies the resulting changes in the provision of FES, and estimates the associated economic values. In the context of the study site in the North Western uplands of Vietnam, we test three alternative forest governance scenarios: business as usual, with a dominant government role; a community-based governance regime; and a private, individual-based forestry governance regime. Scenarios are based quite closely on the way these regimes are (or might be expected to be) implemented in Vietnam. For each forest governance scenario, we map LULC changes based on land suitability analysis and transition likelihood for the period 2010 − 2020. The resulting maps are used as inputs into the InVEST (Integrated Valuation of Environmental Services and Tradeoffs) model, which is used to estimate the quantity of three specific FES: carbon storage/sequestration, sediment yield, and water yield. We apply economic valuation methods to value these services: the social cost of carbon is used to estimate the economic values of carbon storage/sequestration; the cost of removing sediment deposited in reservoirs is applied for valuing the reduction of sediment yield, and the residual value of water supply for hydropower generation is used for valuing water yield. The results show that forest governance regimes have a significant effect not only on forest LULC, but also on the quantity and values of FES derived from forests. The FES are differentially affected by alternative forest governance regimes: some FES increase in quantity and value under some governance regimes and decrease under others. Of the three forest governance regimes examined, there is no one regime that will always be ‘better’ than the others in terms of provisioning all considered FES. For the specific context of Vietnam, we find that the private forest governance scenario is inferior to the community-based governance scenario, as an alternative to the current state-based governance. Because our results pertain to the scenarios as constructed, rather than generally to broad categories of governance regimes, there remains the possibility that regimes can be constructed that outperform all of those examined here. 相似文献
17.
Being fertile lands, wetlands have been managed for traditional agriculture over millennia. However, the integrity and ecosystem services of wetlands are being jeopardized by intensive land-use comprising of drainage and excessive disturbance. An adhoc and intensive use of wetlands, without preserving ecological integrity is causing ecosystem disservices and threatening conversion of a large soil organic carbon (SOC) sink into a net source. Wetlands in the tropical parts of the world are distributed unevenly and represent ∼3% of the total world land area. Due to stagnancy and even reduction in rice (Oryza sativa) yield of many agricultural regions, there is a need for additional and alternative land-uses which can raise the global rice production to ∼1 billion Mg (megagram = 106g = metric ton) by 2050 from ∼497 million Mg now. Wetlands can be a viable option to advance global food security because of high soil fertility and vast geographical distribution. A ‘3-tier rice production system’ is proposed herein based on specific hydrological niche to advance global food security without degrading the ecosystem services of wetlands. In addition to increasing agronomic yield, the proposed modus operandi can also improve the livelihood security of farmers through an additional income streams by: (i) trading of SOC credits generated through adoption of conservation agriculture in littoral zones, and (ii) promoting fish and duckery culture in conjunction with deepwater rice farming. Furthermore, the proposed strategies will also set in motion the process of restoration of wetlands while enhancing C sink capacity of the ecosystems. 相似文献
18.
The compact city is advocated as a key strategy to establish sustainable cities. Compact city policy implies urban densification, sometimes with elimination of green space. Citizen’s valuable arguments in urban densification developments in green space are easily ignored, as is explored in a case study in Amsterdam, the Netherlands. Place making decisions are more often legitimized with sustainability claims, and arguments from less convinced residents are denied or remain unexamined. About green space these also concern environmental qualities significant for long term sustainability of cities. This is illustrated by presenting empirical evidence about environmental education, an argument emerging from the explorative study. Environmental education should be seen as an important element in longterm sustainability, but the educational relevance of proximity of green space to schools had remained unknown. Empirical evidence of the negative effect of larger distances to green space on environmental education is presented in a geographical survey. The results suggest that close proximity to urban green space also reinforces fieldwork activities further away. As the validity of this argument was denied in the case study, this illustrates the need to establish frameworks that foster recognition and learning in open processes in urban densification. 相似文献
19.
Land-use change can significantly affect the provision of ecosystem services. On a local scale, zoning laws and other land-use regulations are commonly used to influence land-use change, but their effectiveness is often unclear. We evaluate the effectiveness of local land-use planning in concentrating development and minimizing impacts in riparian areas. We use spatially-explicit land cover data from the USGS Land Cover Trends project to measure development and disturbance rates before and after implementation of Oregon’s land-use planning system. We apply a difference-in-difference estimator to address the problem of non-random assignment of regulations on the landscape. We find that land-use laws in Oregon have concentrated development inside of UGBs and lowered development rates in riparian areas. However, disturbance in riparian areas has increased inside of UGBs. Overall, our findings suggest that local land-use planning can be an effective tool for promoting the provision of non-market ecosystem services. 相似文献
20.
本文以大庆市为研究区,依据2001年和2009年的土地利用数据,从生态系统服务功能角度,运用Costanza的方法,结合谢高地修正的我国生态服务价值当量因子表,定量研究了土地利用变化引起的生态系统服务价值变化量.结果表明:2001～2009年间,研究区林地和城乡居民点及工矿用地面积增加,其余土地利用类型面积均有减少,其中林地的面积变化量最大.土地利用变化引起了研究区生态环境的变化,对生态系统服务价值也产生了一定的影响,大庆市9年间生态系统服务价值增加了41170.55万元,各单项服务功能价值中,其生态系统所提供的水源涵养、废物处理和食物生产等3项生态服务功能下降,其余6项生态系统服务功能均有不同程度的升高;从不同土地利用类型的生态服务功能看,湿地和水域的生态服务功能较强,只有林地的生态系统服务价值是增加的. 相似文献