自然保护区计划

D. Jelinski, P. Kulakow
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引用次数: 65

摘要

恢复生态学。1985年《食品安全法》的保护储备计划(CRP)规定在10年内留出1600万公顷高度易侵蚀的农田。登记的土地上种植了多年生植被,以减少过剩商品的供应,提高农业收入,保护土壤,并为野生动物提供更好的栖息地。自该计划实施以来,据估计,CRP土地上的土壤侵蚀平均每公顷减少了17公吨(Clark et al., 1993)。此外,CRP土地每年每公顷平均增加1公吨碳(Gebhart等人,1994年)。事实上,据估计,参与CRP计划的土地可能能够吸收美国每年3500万吨大气碳排放中的45% (Gebhart eta!)。, 1994)。目前的CRP合同于1995年10月开始到期,其中40%以上的合同将于1996年10月到期。国会最近重新批准了CRP计划,在该法案的七年有效期内,将其限制在目前的1470万公顷的水平。虽然国会对改善环境的承诺值得称赞,但根据重新授权,选定的土地仍将退出该计划,因为一些租金将减少,并且由于提前退出所有或部分农民登记面积的规定。因此,在众多可用的选择中,农民可以将土地恢复作物生产,开发用于放牧或干草,或在新的保护储备计划中维护它。无论如何,该项目的延续对保护主义者来说都很重要,不仅因为它提供了明显的生态效益,还因为CRP土地为景观尺度上的恢复相关研究提供了几乎无与伦比的机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Conservation Reserve Program
restoration ecology. The Conservation Reserve Program (CRP) provisions of the 1985 Food Security Act set aside 16 million hectares of highly erodible cropland for a period of ten years. The enrolled land was planted with perennial vegetation to reduce the supply of surplus commodities, improve farm income, conserve soil, and provide improved habitat for wildlife. Since the program has been put into effect, it is estimated that soil erosion has been reduced, on average, by 17 metric tons per hectare on CRP lands (Clark et al., 1993). In addition, CRP lands have gained an average of 1 metric ton of carbon per hectare per year (Gebhart et al., 1994). Indeed, it is estimated that the land enrolled in CRP may be able to sequester about 45 percent of the 35 million metric tons of atmospheric carbon originating from U. S. agriculture annually (Gebhart eta!., 1994). Current CRP contracts began expiring in October, 1995, and more than 40 percent of these contracts will have ended by October, 1996. Congress recently reauthorized the CRP program, capping it at the current level of 14.7 million hectares for the seven-year life of the bill. While Congress’s commitment to enhancing the environment is to be applauded, under the reauthorization selected lands will still be withdrawn from the program because some rental payments will be reduced and because of an early-out provision for all or part of a farmer’s enrolled acreage. Thus among the many options available, farmers may return land to crop production, develop it for grazing or haying, or maintain it in the new Conservation Reserve Program. In any case, continuation of the program is important to conservationists, not only because it offers obvious ecological benefits, but also because CRP lands offer virtually unmatched opportunities for restoration-related research on a landscape scale.
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