關(guān)系行為機(jī)制模型研究(發(fā)展經(jīng)濟(jì)學(xué)-中國(guó)科學(xué)院研究生-免費(fèi)閱讀
【正文】 Livestock input (4)– Rotation (2)– Soil erosion (1)Land use in Gezhenyan Village, Zhunger, Inner MongoliaThe policy measure of converting slope field into forest and pasture started Since 2023, with subsidy of 100kg grain and 20Yuan foodfor work per Cropping system and land use Total Flat field Terrace field Slope fieldSown area YieldSown area YieldSown area YieldSown area Yield ha kg/ha ha kg/ha ha kg/ha ha kg/haCorn 6,660 9,250 5,100 3,750Millet 1,819 1,850 1,808Rapeseed 580 660 500Sunflower 885 1,000 836Potato 7,500 7,125 7,725Beans 1,400 1,500 1,300Total Agriculture and farm economy farm type unit Total Farm householdParttime householdhousehold person 21 12 9population person 81 49 32labor person 56 34 22offfarm labor person 14 4 10seasonal offfarm labor person 9 3 6constant offfarm labor person 5 1 4population per household person per household cultivated land ha per household family ine Yuan per household 8,904 9,645 7,998farm ine Yuan per household 5,945 9,018 2,188offfarm ine Yuan per household 2,960 627 5,810ratio of offfarm ine % 33% 7% 73%ratio of livestock ine within farm ine% 66% 69% 51%Prices of agricultural productsmodity farm gate pricesfarm purchase prices modityfarm purchase pricesCorn Wheat Millet Rice Potato Beef Sunflower Fish Rapeseed Vegetable Mutton Compound fertilizer Pork Carbamide Wool 200 Carbon ammonia Goat 240 Corn seed Sheep 140 Hog 800 Soil erosion: EPIC result Soil erosion values derived from EPIC ModelField typeFlat fieldTerraceSlope fieldSlope 0% 5% 10%Maize Millet Sunflower Rapeseed Potato Beans Note: 1)unit is ton results are means of ten years. 2)simulation results are means of ten years.Agriculture and land use system? Croplivestock system: corngoatsheephog.? Corn mainly in flat field for feed and mercial use。區(qū)域可持續(xù)發(fā)展與人地關(guān)系行為機(jī)制模型研究石 敏俊筑波大學(xué)區(qū)域可持續(xù)發(fā)展與人地關(guān)系行為機(jī)制模型研究 ? 區(qū)域可持續(xù)發(fā)展與農(nóng)業(yè)環(huán)境政策? 人地關(guān)系行為機(jī)制模型框架的建立：外部社會(huì)經(jīng)濟(jì)因素影響人地關(guān)系變化的機(jī)制? 鄂爾多斯高原： 人地關(guān)系 行為機(jī)制模型 與退耕還林對(duì)水土保持影響的比較靜態(tài)模擬? 自然科學(xué)與社會(huì)科學(xué)相融合的必要性區(qū)域可持續(xù)發(fā)展與農(nóng)業(yè)環(huán)境政策 ? 歐美國(guó)家的農(nóng)業(yè)環(huán)境政策–石油農(nóng)業(yè)的化肥農(nóng)藥高投入導(dǎo)致水質(zhì)污染等環(huán)境問(wèn)題–價(jià)格支持政策導(dǎo)致農(nóng)產(chǎn)品過(guò)剩–農(nóng)業(yè)環(huán)境政策的核心是推行農(nóng)業(yè)粗放化經(jīng)營(yíng)，減少化肥農(nóng)藥投入，減少農(nóng)產(chǎn)品產(chǎn)量–對(duì)于實(shí)行粗放經(jīng)營(yíng)的農(nóng)戶(hù)給予政策補(bǔ)貼發(fā)展中國(guó)家的農(nóng)業(yè)環(huán)境問(wèn)題? 土地退化引起的農(nóng)業(yè)環(huán)境問(wèn)題– 沙漠化，水土流失，鹽堿化? 環(huán)境負(fù)荷引起的農(nóng)業(yè)環(huán)境問(wèn)題– 水質(zhì)污染，土壤污染? 土地退化的人為因素– 人口壓力，農(nóng)業(yè)技術(shù)水平? 依賴(lài)資源投入的靜態(tài)增長(zhǎng)導(dǎo)致農(nóng)業(yè)粗放再生產(chǎn)和土地利用的平面擴(kuò)張，土地利用超過(guò)環(huán)境容量時(shí)帶來(lái)土地退化發(fā)展中國(guó)家的農(nóng)業(yè)可持續(xù)發(fā)展? 解決土地退化問(wèn)題的出路在于發(fā)展可持續(xù)集約農(nóng)業(yè)–可持續(xù)集約農(nóng)業(yè)：通過(guò)集約化達(dá)到可持續(xù)? 集約化：對(duì)少量土地實(shí)行集約經(jīng)營(yíng)
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