關系行為機制模型研究(發(fā)展經濟學-中國科學院研究生-文庫吧在線文庫
【正文】 ock activity (livestock ine:70%).? Parttime households earn most ine from offfarm activity(73%). Offfarm job opportunity is limited.? Only members of the village can gain right of land management. There is few mobility of land management right.退耕還林還草政策對水土保持影響的比較靜態(tài)模擬 ? 模擬結果與現(xiàn)狀的擬合比較? 農產品價格變動對土地利用變化影響的比較靜態(tài)模擬結果? 退耕還林還草政策對土地利用變化和水土保持影響的比較靜態(tài)模擬結果? 退耕還林還草補貼對土地利用變化和水土保持影響的比較靜態(tài)模擬結果? 非農就業(yè)機會對土地利用變化和水土保持影響的比較靜態(tài)模擬結果Comparison between actual situation and base run results unit Actual situation in 2023 Base run Total family ine Yuan 139,141 194,403 Crop production Corn flat mu Corn terrace mu Corn slope mu Feed corn flat mu Feed corn terrace mu Feed corn slope mu Millet Terrace mu Millet Slope mu Potato terrace mu Potato slope mu Sunflower terrace mu Sunflower slope mu Rapeseed terrace mu Rapeseed slope mu Bean mu Livestock Goat family labor head Shed sheep head Hog head Grazing cattle head The base run? Households may realize a significant increase in ine without increase in soil erosion if they put a much great weight on sedentary livestock by using maize and straws as fodder instead of selling maize to earn cash ine, and change to grow much more cash crops such as sunflower and rapeseeds in stead of millet. ? One of probable reason of farmers selfsufficient choice is from constraint of investment. Another probable reason is from farmers risk aversion. Price change and land degradation? Changes in prices of livestock will affect livestock choice, but have no significant effects on land use choice as well as soil erosion.? Changes in price ratios of mercial crops affect land use choice, especially land use choice of slope fields, and then have significant impacts on soil erosion. ? The effects of price change on soil erosion depend on ratio of erosion modulus between concerning crops. Offfarm job opportunity and soil erosion? Increase in offfarm job opportunities for seasonal parttime labors have few effects on land use activities. ? Increase in offfarm job opportunities for constant offfarm labors will influence land use choice and then land degradation. ? 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? In
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