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1.
Although the adaptation strategies of smallholder farmers to climate change and its attendant hazards have attracted widespread attention, the quantitative detection and evaluation of their adaptive behaviors remains a difficult task that deserves further study. This article describes an empirical case study performed in southern China to examine the adaptation strategies of paddy farmers to agricultural drought. We collected first-hand data through household questionnaires, in-depth interviews with local managers, and farm-level land-use surveys. The effectiveness of the adaptation approaches of the farmers was assessed in terms of the ecological, economic, and social benefits. Our findings indicate that over the past three decades, when confronted with recurrent seasonal drought in a warming climate, farmers have gradually abandoned the double-cropping rice production and transformed their cropping patterns into a new diversified mode of “Rice-Cole, rice, cotton, seedling nursery, and coarse cereals”. Current farming practice reduces the vulnerability of local agriculture to drought, and allows farmers to diversify and improve their incomes, which contributes to enhanced resilience and adaptability to drought. However, the autonomous adaptation of farmers may primarily serve their interests of minimizing drought risk and maximizing economic profits but could also undermine the social benefits, such as regional grain security. A robust adaptation strategy should balance the ecological and economic benefits with social interests to maintain agricultural sustainability. 相似文献
2.
China's Sloping Land Conversion Program (SLCP) pays millions of farmers to convert cropland in upper watersheds to tree plantations. It is considered one of the world's largest payments for ecosystem services (PES) scheme for its reliance on financial incentives. This paper examines the outcomes of the SLCP by way of a case study from the Yangliu watershed in Yunnan province. It focuses on the notions of justice embedded in state policy and held by villagers and local state officials in order to understand the observed outcomes in terms of people's participation in the implementation of the SLCP, land use changes and livelihood effects. Villagers, local state officials, and state policy share a primary concern about distributive justice despite significant differences in their specific notions. The shared concern underlies the villagers’ positive reactions to the SLCP, which among other factors, have led to the intended expansion of tree plantations and a livelihood transition in Yangliu since 2003. The insights from Yangliu suggest the need to consider justice for a fuller understanding of the dynamics and outcomes of the SLCP and other PES schemes worldwide as the notions of justice applied by the involved actors may influence land use and livelihood dynamics in addition to the other factors considered in research this far. 相似文献
3.
The study regards the processing of data on urban land conversion along the Italian Adriatic coast in the last 50 years. The results obtained show different aspects of the phenomenon: values were obtained for the average annual speed of transformation of the coastal strip; clustering, dispersion and statistical concentration of the data obtained were studied, which has made it possible to show unparalleled threshold values in the present levels of urbanization; geostatistical surveys were conducted to determine the distribution changes of urban concentration over time; analyses were developed to point out what landscape and morphological elements have emerged, and are tendentially confirming greater sensitivity to land artificialization; a number of comparisons based on specific indicators were produced that show the typological and geographic variations of development taking place in the time period studied; important information has emerged on the different territorial policies implemented by the regions over the long-term. This research has made it possible to investigate one of the largest and most intense land transformation phenomena in Italy which has led to the construction of an urban organism extending along more than 1470 km of coast with very few breaks which, together with railroad and motorway infrastructural elements, forms the longest urban stretch in southern Europe and one of the most extensive in the entire continent. A further result of the work carried out concerned the extraction of data on the remaining coastal stretches, i.e. those not yet affected by urban transformation and thus of extreme importance for policies focused on the preservation of community habitats and the preservation of coastal landscape. In conclusion, it has been possible to draw a map of management responsibilities at the municipal and regional levels for the revision of future urban planning trends in terms of sustainable governance. 相似文献
4.
The paper analyses the period from 1782 to 2006 divided according to the existing political systems in three rural study sites of Slovakia. Two long, monarchy (I.LMP) and revolutionary (II.LRP), and one short new age (III.SNP) periods are compared. The magnitude of land-use and cover changes induced by related driving forces during the different historical periods are also analysed. Three different study sites were selected: cadastre of Kráľov Brod (KB), mountain cadastres: Očová and Dúbravy (OD), Liptovská Teplička (LT). Spatial data derived from historical maps were used in comparison to recent data obtained using Remote Sensing technology. The results showed that the landscape of all three sites has undergone significant changes in land-use and cover during the 224 years. From the long-term point of view there two main trends were observed. The first was significant permanent grassland conversion into arable land at KB where permanent grasslands decreased from 52.7% in 1782 to 0.7% in 2006. Gradual afforestation and permanent grassland conversion to forest land was observed at LT where forest land increased from 67.7% in 1782 to 83.7% in 2006. During the I.LMP period, demographic trends and settlement pattern supported by effective land-use policy were the dominant driving forces. Similarly these driving forces were identified as the most important also for the III.SNP period. But contrary to the I.LMP, driving forces of the III.SNP caused more negative effects (land abandonment) in mountain rural LT region where the current land-use policy seems to be insufficient. Land-use changes during the II.LRP were mostly due to technological development. 相似文献
5.
This paper investigates the feasibility of changes in cropland-use as an adaptation strategy to minimise the economy-wide costs of climate change on agriculture. Nepal makes an interesting case study as it is one of the most vulnerable agricultural economies within South Asia. We develop a comparative static multi-household computable general equilibrium (CGE) model for Nepal, with a nested set of constant elasticity of transformation (CET) functional forms, to model the allocation of land within different agricultural sectors. Land transformation elasticities in these CET functions are allowed to reflect the ease of switching from one crop to another based on their agronomic characteristics. The results suggest that, in the long run, farmers in Nepal tend to allocate land to crops that are comparatively less impacted by climate change, such as paddy, thereby minimising the economy-wide impacts of climate change. Furthermore, the results reveal that land-use change tends to reduce the income disparity between different household groups by significantly moderating the income losses of marginal farmers. Therefore, it is suggested that policy makers in Nepal should prioritise schemes such as providing climate-smart paddy varieties (i.e., those that are resistant to heat, drought and floods) to farmers, subsidising fertilizers, improving agronomic practices, and educating farmers to switch from crops that are highly impacted by climate change to those that are not, such as paddy. 相似文献
6.
Growing demand for agricultural produce, coupled with ambitious targets for greenhouse gas emissions reduction present the scientific, policy and agricultural sectors with a substantial mitigation challenge. Identification and implementation of suitable mitigation measures is driven by both the measures’ effectiveness and cost of implementation. Marginal abatement cost curves (MACCs) provide a simple graphical representation of the abatement potential and cost-effectiveness of mitigation measures to aid policy decision-making. Accounting for heterogeneity in farm conditions and subsequent abatement potentials in mitigation policy is problematic, and may be aided by the development of tailored MACCs. Robust MACC development is currently lacking for mitigation measures appropriate to sheep systems. This study constructed farm-specific MACCs for a lowland, upland and hill sheep farm in the UK. The stand-alone mitigation potential of six measures was modelled, against real farm baselines, according to assumed impacts on emissions and productivity. The MACCs revealed the potential for negative cost emissions’ abatement in the sheep industry. Improving ewe nutrition to increase lamb survival offered considerable abatement potential at a negative cost to the farmers across all farms while, lambing as yearlings offered negative cost abatement potential on lowland and upland farms. The results broadly advocate maximising lamb output from existing inputs on all farm categories, and highlight the importance of productivity and efficiency as influential drivers of emissions abatement in the sector. The abatement potentials and marginal costs of other measures (e.g. reducing mineral fertiliser use and selecting pasture plants bred to minimise dietary nitrogen losses) varied between farms, and this heterogeneity was more frequently attributable to differences in individual farm management than land classification. This has important implications for the high level policy sector as no two farms are likely to benefit from a generic one size fits all approach to mitigation. The construction of further case-study farm MACCs under varying farm conditions is required to define the biophysical and management conditions that each measure is most suited to, generating a more tailored set of sector-specific mitigation parameters. 相似文献
7.
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
8.
In recent years, the sustainable utilization of China’s arable land has been confronted with several challenges. The China government has been very strict in arable land protection, and a package of policies and measures have been promulgated. All these endeavors are of great significance for proposing an innovative policy system for sustainable land use in China. However, above stated policies are all designed from the perspective of space control with the purpose of reducing arable land loss or increasing arable land area, few policies have been designed from the perspective of utilization control, namely guide the actual arable land farming in sustainable ways and constraint unreasonable land use behavior such as overuse, rough use, land abandonment. In this paper, we analyze spatial distribution of average land-use intensity (ALUI) at the county-level in Mainland China, which can be used as a significant index for evaluating the rationality of arable land use and providing effective decision-making supporting information for design of regional arable land protection policy. Based on the experimental results, there is still considerable room for yield improvement as the ALUI of ∼73.1 % counties are lower than 0.7 while the 53.60 % counties are lower than 0.6. Furthermore, the ALUI dataset shows significant global spatial autocorrelation characteristic. Boundaries of regions that aggregated by counties with high ALUI are more consistent with that of provincial administrative districts, comparing with that of sub-standard farming system regions. On the other hand, counties with low ALUI are mostly cluster in mountains, hills, or plateaus, where grain yield is mainly limited by regional hydrothermal conditions. In addition, counties with different ALUI status have been divided into six classes, using k-means clustering algorithm. This will facilitate the understanding of appropriate arable land protection and utilization paths for different regions and the rethinking of current support policies on farmland protection. 相似文献
9.
Land-use models express the relationship between various driving forces of land-use changes and are increasingly employed in practical applications to predict possible future land uses. The relationship between the agricultural land market and land-use changes is often neglected in such models. The objective of this study is to assess the production values of agricultural land to be integrated in an operational land-use model with the aim to improve understanding of land-use changes in all 28 European Union countries. This economic evaluation of agricultural land is based on the Net Present Value (NPV) method, a method that aims at uncovering the operational production values of land rather than real estate market value. The scientific relevance of this work is the development of a comprehensive methodology for the economic evaluation of agricultural land uses in different EU countries, the integration of economic production values of land to the local suitability approach in the studied land-use model and the provision of a EU-wide database of the NPVs of agricultural land uses, including various energy crops. 相似文献
10.
Between 2003 and 2013, sugarcane area expanded six-fold, from 142,000 ha to 847,000 ha, in Goiás State and the Federal District, Brazil. And while there has been much research on land-use dynamics of sugarcane expansion in established sugarcane growing regions, little is known about the dynamics associated with its expansion in sugarcane frontiers like Goiás. Understanding these dynamics provides critical information for environmental, economic, and political decisions. Here, we investigate the agricultural land-use change dynamics associated with sugarcane production in Goiás and interrogate the relationship between biophysical, institutional, and logistical factors associated with sugarcane expansion. Our results demonstrate that pasture is seven times more likely to be converted to sugarcane than soy, and most new sugarcane area was not sourced in native Cerrado vegetation. Although there exist few biophysical limitations to sugarcane expansion, capital, infrastructure, and institutions constrain production. Lastly, we show that areas where soy is currently cultivated may be converted to sugarcane in the future given the expansion of transportation and sugarcane infrastructure. Thus, we suggest incentivizing the cultivation of sugarcane on degraded pastures and supporting increased pasture stocking rates to ensure continued protection of both natural vegetation and food production while supporting the expansion of sugarcane in the state. 相似文献
11.
The rapid expansion of hybrid maize in the uplands of northern Laos is viewed by the government as meeting policy aims related to green economic development. Yet, growing evidence of negative consequences of maize expansion are emerging. Based on farmers’ perceptions, we study: (1) farmers’ reasons for adopting and abandoning maize, and; (2) implications of commercial maize expansion on local livelihood security and inclusiveness (food supply, income, risk coping, and ability to join maize growing), and environmental sustainability (productivity, and soil and forest quality) over time (2013 and 2016). Results show that maize has advantages in terms of labour allocation, and it provides much-needed cash income. Yet, swidden is the main food provider and an essential safety net for unforeseen risks (including maize crop failures or price fluctuations). The way that maize was produced did not meet the criteria of green economic development due to its negative effects on the environment (soil and forest degradation) and socioeconomic sustainability (household differentiation, increased economic risks, debts, and food insecurity). By providing a local perspective, this study encourages a critical reflection of the underlying assumptions and conceptualization of the green economy approach in Laos, and argues for policies and measures that consider a more holistic perspective of human wellbeing and the environment. 相似文献
12.
Gregory S. Latta Justin S. Baker Robert H. Beach Steven K. Rose Bruce A. McCarl 《Journal of Forest Economics》2013,19(4):361-383
This study applies an intertemporal partial equilibrium model of the U.S. Forest and Agricultural sectors to assess the market, land use, and greenhouse gas (GHG) implications of biomass electricity expansion. Results show how intertemporal optimization procedures can yield different biomass feedstock portfolios and GHG performance metrics at different points in time. We examine the implications of restricting feedstock eligibility, land use change, and commodity substitution to put our results in the context of previous forest-only modeling efforts. Our results highlight the importance of dynamic considerations and forest and agricultural sector interactions on projecting the GHG effects of biomass electricity expansion in the U.S. 相似文献
13.
Recently, dramatic flood disasters have occurred incrementally in several regions of the world. Land-use change as one of the main affecting factors becomes a key component in flood risk management. This study strives to deal with quantifying how changes in land use to affect the dynamic evolution of flood vulnerability. The floodplains of Wuhan, which are located in the Yangtze River Basin, have been selected as an example. In this paper, we use GIS to gather different historical geometric data as sources of land-use information. By proposing the Simpsons-dominance index and location index to analyze the characteristics of land-use changes, and building a quantitative model to measure flood vulnerability, a series of flood vulnerability maps demonstrate differential flood vulnerability of floodplains of Wuhan in three inundation scenarios and four historical periods. Finally, the non-parametric correlation is used to reveal the interactive effect of land use and flood vulnerability. Based on this study, comprehensive flood disaster management strategies for land-use planning are proposed for government decision-makers to reduce the flood vulnerability of Wuhan in future. 相似文献
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15.
European Russia rapidly transitioned after the collapse of the Soviet Union from state socialism to a market economy. How did this political and economic transformation interact with ecological conditions to determine forest loss and gain? We explore this question with a study of European Russia in the two decades following the collapse of the Soviet Union. We identify three sets of potential determinants of forest-cover change—supply-side (environmental), demand-side (economic), and political/administrative factors. Using new satellite data for three distinct types of forest-cover change—logging, forest fires, and forest gain—we quantify the relative importance of these variables in province-level regression models during periods of a) state collapse (1990s), and b) state growth (2000s). The three sets of covariates jointly explain considerable variation in the outcomes we examine, with size of forest bureaucracy, autonomous status of the region, and prevalence of evergreen forests emerging as robust predictors of forest-cover change. Overall, economic and administrative variables are significantly associated with rates of logging and reforestation, while environmental variables have high explanatory power for patterns of forest fire loss. 相似文献
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17.
With the current implementation of the Common Agricultural Policy (CAP) for 2014–2020, the European Commission wants to move towards “greener” farming practices in the European Union. Therefore, the EU funds both obligatory measures, such as Ecological Focus Areas (EFAs) through the Green Direct Payment program, and voluntary agri-environment measures. However, empirically evaluating the effectiveness of these measures is challenging. We therefore demonstrate here that mechanistic simulation models are a valuable tool for performing these evaluations. As an example, we use the Animal, Landscape and Man Simulation System (ALMaSS), an established simulation system that has been used to simulate a wide range of farmland species relevant to biodiversity. We analysed the benefits of seven greening scenarios for the European brown hare (Lepus europaeus), which has been in widespread decline throughout Europe since the 1960s. We examined the effects of the following EFA types on hare population dynamics: the cultivation of legumes such as (1) peas and (2) beans, (3) permanent and (4) rotational set-asides, (5) permanent extensive grasslands, and (6) herbaceous and (7) woody field margins. The cover of each type was increased separately up to 5% of the area in three Danish landscapes, which are characterised by low hare densities. The effects on female and yearling abundance were observed over a period of 30 years. All greening scenarios had significant positive effects on hare populations. The relative change in female abundance ranged from a factor of 0.4 in the peas scenario to 3.6 in the permanent set-aside scenario. However, only one EFA type, permanent set-asides, led to densities of more than 10 females per km2 in all three landscapes, which we assumed to be the threshold for population viability. Herbaceous field margins were the second best EFA type, leading to population viability in two landscapes. Our results indicate that overall, 5% coverage with Ecological Focus Area is insufficient to improve the living conditions of the brown hare to a necessary degree. Permanent set-asides seem to be the most valuable type of EFA, but this needs to be confirmed for a wider range of species and landscapes. Using mechanistic simulation models for a suite of representative species, types of agricultural landscapes, and eco-regions could help in achieving the aim of the European Commission to promote biodiversity in the European community via greener farming practices. 相似文献
18.
The paper addresses the claim made recently in this journal [Wood, D., Lenné, J.M., 2005. ‘Received Wisdom’ in agricultural land use policy: 10 years on from Rio. Land Use Policy 22, 75–93] that in situ agrobiodiversity conservation is anti-development. In particular, I argue that Wood and Lenné appear to have misinterpreted the human ecology paradigm. My proposition is that opportunities are emerging that effectively support local diversity for multiple conservation and development outcomes within marginal agricultural systems. 相似文献
19.
Agricultural land-use change during economic reforms in Ghana 总被引:1,自引:0,他引:1
Land-use change is driven by many interrelated factors including national policies formulated in response to the forces of globalization. This study integrates remote sensing data with social surveys to identify the role of demographic, technology and market-related variables in cropland expansion during economic reforms in Ghana. Macroeconomic changes increased the commercial orientation of farming as the sources of food supply changed from import to domestic production. However interest rates liberalization increased the use of labor at the expense of fertilizer and other complementary inputs. Demographic variables were more important in explaining cropland change after structural adjustment. Public agricultural support services are required for sustainable market-induced agricultural change in Ghana. 相似文献
20.
As concern grows regarding urban sprawl and forest and agricultural land preservation, the effectiveness of land-use policies in shaping land-use change warrants further study. We evaluate the impact of county-level zoning laws, the most predominant land use policy in the USA, and land rents on the relative amounts of forest, agricultural, and developed land, while controlling for demographic information and taxation rates. Over the past decades, southern Indiana has experienced forest regrowth on private lands, but this regrowth has declined in recent years with increased conversion of open space for urban residential development. We develop a model of land-use shares in 40 southern Indiana counties based on the net benefits to agriculture, forestland, and urban uses using a maximum likelihood estimation of a Dirichlet distribution. We find agricultural land rent and indicators of land productivity are the most important predictors of the proportion of agriculture and urban uses. Forest use is better explained by shifting regional economic structure and hilly terrain. Counties with a greater proportion of their work force in the service sectors have a greater proportion of land forested. Finally, to some extent zoning may protect agricultural land in the region, although land rents, land characteristics, and population are strong predictors of the ratio of agriculture to urban use. 相似文献