關系行為機制模型研究課件-文庫吧資料
2025-02-11 04:37本頁面
【正文】 ion. ? While the number of constant offfarm labors continues to increase and exceeds over 25 persons, cultivation of millet in slope fields will tend to decrease. ? As the result, soil erosion will tend to decrease due to withdrawal of cultivation in slope fields along with an increase in offfarm job opportunities. Land conversion policy and soil erosion? Introducing land conversion policy will affect land use choice of slope fields as well as terrace fields, and conitant livestock choice, then have significant effects on reducing soil erosion.? Subsidy towards converted slope fields will encourage conversion of slope fields and have significant effects on land use choice, livestock choice as well as soil erosion.Subsidy and soil erosion? When introducing land conversion policy without subsidy, farm ine tends to decrease as a cost for bating soil erosion. While allowance of more than 160 Yuan per was paid for farmers, soil erosion will be relieved significantly with an increase in farm ine. ? The subsidy for converted slope fields in loess plateau includes 100kg grain with a price of per kg and 20Yuan of foodfor work aid per , which is equal to 160Yuan per . Conclusion and implication? An integrated bioeconomic household model may simulate the effects of change in socioeconomic factors on land degradation by involving farm economic behavior within an integrated framework.? Mathematical programming approach is useful to develop a bioeconomic household model because it can bine farm economic behavior and biophysical process.Conclusion and implicationcontinue? The soil conservation program to convert slope fields into forest or pasture is an effective way for bating soil erosion. ? A reasonable subsidy as pensation that is higher than profit of land use activity of converted slope fields may encourage farmers join the conservation program and adopt of conversion activity.Conclusion and implicationcontinue? Farmers might go back to cultivate slope fields that have been converted into pasture when the subsidy stopped. ? To consolidate the achievement of bating soil erosion, how to develop alternative sectors and to increase household ine after farmers converted slope fields into pasture became an inevitable issue. ? A considerable policy is to encourage and assist farmers to develop sedentary livestock by using crops produced from fields as fodder and forage grass from the converted slope fields. 關于退耕還林政策的進一步思考? 退耕還林政策的巨大作用– 短期內促進了坡地退耕，減少了水土流失? 退耕還林政策的局限性– 恢復林草植被 ? 退耕地有
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