• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >The role of agriculture in resource management: The case of bush-fallow agriculture in Sudan.
【24h】

The role of agriculture in resource management: The case of bush-fallow agriculture in Sudan.

机译：农业在资源管理中的作用：以苏丹的丛林休闲农业为例。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In Sudan, a large belt of land across Kordofan Province is currently vulnerable to desertification. This belt intersects large areas of customary agriculture, known as the bush-fallow system, that incorporates Acacia senegal tress into fallow periods as a way to manage soil productivity, reduce erosion, and obtain the other benefits from the tree, which include firewood, fodder, and gum arabic. Despite the possible environmental advantages of a bush-fallow system, it continues on a path where crop yields and the acacia stock are declining.;A dynamic household model is developed for bush-fallow agriculture to analyze long-run resource allocation. The model starts with the basic idea of the household as a unit of consumption and production and then formulates the fallow rotation structure of production. Soil productivity and acacia biomass are modeled as state variables whose time paths depend on variable input choices, such as labor, and the land allocation between tillage and fallow.;The model extends earlier work in several ways. First, the conditions for dynamic production efficiency are derived. Since the variable inputs affect the state variables through the state equations, the total cost of the inputs include not only a wage rate but also the value to the household of the change in the state variables. Second, the dynamic formulation, which allows the effects of current choices on future revenues and quantities of the state variables to be internalized in the decision-making process, shows that it may be optimal for the household to deplete the soil and deforest the land. And third, the optimal-rotation principle is extended to an agricultural household model where the objective is to maximize the present value of utility rather than profits.;An empirical approach using dynamic duality is developed that shows how the theoretical model can be used to specify an econometric model. The implications of the duality approach could not be tested with the data set available, however a simplified version of the econometric model is estimated using aggregate production and price data for Kordofan Province.
机译：在苏丹，科尔多凡省的一大片土地目前容易受到沙漠化的影响。这条带与大片的传统农业相交，被称为“灌木小叶系统”，该系统将塞内加尔相思树种纳入休耕期，以管理土壤生产力，减少侵蚀并从树上获得其他好处，其中包括柴火，饲料和阿拉伯树胶。尽管灌木小休系统可能具有环境优势，但它仍在作物单产和相思树种减少的道路上继续发展。；为灌木小休农业开发了动态家庭模型，以分析长期资源分配。该模型从家庭作为消费和生产单位的基本思想开始，然后制定生产的休假轮换结构。土壤生产力和金合欢生物量被建模为状态变量，其时间路径取决于变量输入的选择，例如劳动力，以及耕作和休耕之间的土地分配。;该模型以多种方式扩展了早期的工作。首先，得出动态生产效率的条件。由于变量输入通过状态方程影响状态变量，因此输入的总成本不仅包括工资率，还包括状态变量的变化对家庭的价值。其次，动态公式使当前选择对未来收入和状态变量数量的影响可以在决策过程中内在化，这表明家庭枯竭土壤和砍伐森林可能是最佳选择。第三，将最优轮换原则扩展到目标是使效用的现值最大化而不是利润最大化的农户模型。提出了一种使用动态对偶的经验方法，该方法显示了如何使用理论模型来指定计量经济模型。不能用可用的数据集来检验对偶方法的含义，但是，使用科尔多凡省的总生产和价格数据估算了计量经济模型的简化版本。

著录项

  • 作者

    Larson, Bruce Alan.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Agricultural economics.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 221 p.
  • 总页数 221
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号