關(guān)系行為機制模型研究課件-wenkub.com
2025-02-05 04:37 本頁面
【正文】 rapeseed, sunflower in terrace and slope field for mercial use。labor allocation constraints (10): family labor (3), hiring labor (7)– Balance (25):Nutrition and human demand (10)。– Difficult to derive function form of the reducedform equation. ? Meta modeling (Decision rule) approach: – Estimate a statistical relationship between exogenous and relevant endogenous variables。 refer to a blackbox representation of relationship between exogenous and endogenous variables。Farming input (11)。 potato and beans for selfconsumption.? Field type is most important factor affecting yield.? Level of input and technological choice of various crops correspond to field types.? Soil erosion modulus differ between field types and various crops.Farm economy ? Smallholders: farm households(12) and parttime households(9).? Farm households earn ine from croplivestock 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(jié)果與現(xiàn)狀的擬合比較? 農(nóng)產(chǎn)品價格變動對土地利用變化影響的比較靜態(tài)模擬結(jié)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(jié)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(jié)果? 非農(nóng)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(jié)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 la
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