共查询到20条相似文献,搜索用时 328 毫秒
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我国黄羽肉鸡是中国农业科学院畜牧研究所及其协作单位利用我国北京油鸡、新浦东鸡、石歧杂鸡等地方优良种鸡和外来鸡种进行三元杂交的我国第一代肉鸡。 我国黄羽鸡,一是鸡的羽毛、鸡喙和鸡脚的颜色都是黄色的;二是肉鸡的皮 相似文献
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山东省是畜禽遗传资源大省,地方畜禽品种40个,培育品种或配套系20个。通过强化体制机制、构建资源保护体系、注重资源挖掘利用、加快科技创新等措施,推进全省畜禽遗传资源保护利用水平不断提升。2017年山东省设立"山东省畜禽遗传资源基因库",开展全省畜禽遗传资源冷冻精液、胚胎、体细胞及其他组织材料的保存。 相似文献
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湿地立法在中国面临许多困难,主要是由于湿地概念没有引入国家环境资源法律;生态系统保护理念与法律目标仍在形成之中;现存管理体制与湿地保护的系统性相冲突等等。为了促进中国的湿地管理,需要借鉴国外较先进成熟的湿地立法,尤其是国外湿地立法的体例、宗旨与管理体制。参考这些方面,对解决中国的湿地保护立法中的问题大有帮助。 相似文献
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耕地资源价值探讨 总被引:47,自引:5,他引:47
研究目的 :构建自然资源的价值论 ,界定耕地资源的价值内涵 ,最终实现耕地资源价值重建和耕地保护的目的。研究方法 :文献资料法和比较分析法。研究结论 :耕地保护问题的关键在于把耕地资源总价值纳入耕地经营收益中 ;国内外对耕地资源价值的研究存在着价值范畴不清和耕地资源价值研究的理论基础尚未建立的问题 ;使用价值是哲学价值在经济学中的表现形式 ,效用是使用价值的抽象 ;修正的边际效用价值论是科学合理的自然资源价值论 ;耕地资源总价值不等于经济价值 ,耕地资源总价值包括可以用货币衡量的价值和不能用货币衡量的价值 ,其中可用货币衡量的价值不仅包括经济价值 ,还包括生态价值、社会价值、认识价值的生产价值、道德价值的生产价值和审美价值的生产价值。 相似文献
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Valuing animal genetic resources: a choice modeling application to indigenous cattle in Kenya 总被引:5,自引:0,他引:5
In an effort to improve productivity and profits, many farmers have replaced traditional livestock breeds with higher yielding alternatives. While such changes may bring about short‐term economic gains, the loss of traditional livestock breeds could result in the loss of an important genetic resource as a variety of important genetic traits adapted to local conditions gradually become less common in the population. This is a particular problem in Africa, where livestock make a substantial contribution to human livelihoods. Using the example of cattle in Kenya's pastoral livestock markets this study uses a choice experiment approach to investigate buyers' preferences for indigenous breeds such as the Maasai Zebu. The analysis employs a latent class approach to characterize heterogeneity in valuations both within and across respondents buying cattle for breeding, slaughter, or resale. The results show that there are at least three classes of buyers with distinct preferences for cattle traits and that most buyers favor exotic rather than indigenous breeds. Such preferences have implications for the conservation of indigenous cattle in Kenya and in other developing countries and suggest that some form of intervention may be required to ensure the preservation of this important animal genetic resource. 相似文献
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汉代是中国养马业大获发展的时期,由于同周边民族的战争,疆域的扩展以及对外关系的不断发展,大量外来的马种被引入,利用外来马种对本地马种进行改良也提上了日程,经过几百年的选育培养,使得内地马种得到根本性的改良,从考古资料看汉代马种比前代大大进步。 相似文献
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构建国有林区森林资源安全指标体系,基于2000—2016年黑龙江省国有林区森林资源的时间序列数据,采用熵权法测算森林资源安全综合指数,运用多元线性回归法分析森林资源管护承包对国有林区森林资源安全的影响。结果表明:2015—2016年黑龙江省国有林区的森林资源安全总体处于良好阶段;森林资源管护投资、个体承包管护面积占管护总面积的比例等对国有林区森林资源安全产生显著的正向影响;管护资本投入是对森林资源安全影响最大的人为干预因素,火灾发生次数是对森林资源安全影响最大的自然灾害因素。因此,为了保障国有林区森林资源安全,建议加大管护资金投入,增加管护人员数量,组建联合管护队伍,签订管护责任书,加强森林巡护,防范自然灾害的发生。 相似文献
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Livestock diversity provides genetic alternatives that facilitate sustainable agricultural development. Despite this, animal genetic resources (AnGR) are being depleted at alarming rates. Subsidises available to production systems based on imported breeds are of several orders of magnitude greater than the costs of local breed conservation. Economic arguments for the conservation and sustainable use of threatened AnGR can be an effective means of establishing support for the development of appropriate enabling environments. Despite the importance of the economics of AnGR conservation, the subject has received limited attention. Reasons include: methodological difficulties inherent in valuing genetic resources; limited knowledge about appropriate analytical techniques; and lack of data regarding local breeds. As recent advances in economic valuation have eased methodological/analytical constraints, the issue of data availability has become critical. Data related to livestock keepers' preferences for different genetic resource attributes and the value placed on these across species, breeds and production systems are needed. Based on a study of a local pig breed in Mexico, this paper shows how the use of rural appraisal methods, in conjunction with recently developed analytical techniques, are capable of providing the data required for understanding the type and costs of interventions necessary to promote the conservation and sustainable use of AnGR. 相似文献
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森林生态建设与产权制度改革 总被引:3,自引:0,他引:3
在分析我国森林资源产权的变革对林业生产性质和生态环境保护带来巨大影响的基础上,进一步分析森林资源产权制度与森林生态保护之间的关系,针对生态公益林和商品林产权结构的管理,提出了森林生态保护与资源产权结构的新模式。 相似文献
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在对林芝地区生态旅游资源进行实地调查的基础上,分析了目前生态旅游资源保护现状及存在的问题,提出了相应的对策措施,以实现该地区生态旅游资源的保护与可持续利用。 相似文献
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The Brazilian native vegetation supports essential ecosystem services and biodiversity for the global society, while land use competition may intensify around the increasing needs for food, fibre and bioenergy. The Brazilian Forest Act of 2012 amplified a market-based mechanism for offsetting native vegetation deficits in private farmlands. This mechanism enables a large-scale trading system allowing landholders to offset their own deficits of native vegetation by purchasing certificates associated with a surplus of native vegetation from other landholders. This mechanism is an alternative for the more expensive restoration of native vegetation on own land. The launching of the mechanism now depends on specific regulations at state level, which may include geographical restrictions for offsetting deficits. The aim of this study is to evaluate the effects in nature protection and socio-economic development of different offsetting implementation alternatives. Our findings suggest that in a business-as-usual scenario the offsetting mechanism may have little or no additional effects on protection of native vegetation, because most of the offsetting is likely to take place where native vegetation is already protected by prevailing legislations. We concluded that it is possible to maximise environmental and socio-economic returns from the offsetting mechanism without undermining productive land. This would be possible if regulations ensure additionality in nature protection while enabling a self-sustaining mechanism for income generation for small-scale family farmers in the poorest region of Brazil, protecting biodiversity and counteracting major trade-offs between ecosystem services. 相似文献