【摘要】 以黄土高原典型沟壑区长武县为研究区域,进行区域农田有机物质投入量估算方法的研究。将农田有机物质投入分为秸秆还田、秸秆根茬残留、作物地下生物量和有机肥4个部分分别进行估算。基于LANDSAT 5卫星遥感资料,利用CASA模型估算植物第一净生产力,获得作物整株重,结合作物根冠比估算作物地上生物量和地下生物量,以地上生物量和实地秸秆调查来估算秸秆根茬量和秸秆还田量。估算结果显示,长武县农田年总有机物质投入量为42700 t。更多还原

【Abstract】 A method for estimating the total inputs of organic matter to farmland was proposed in the paper. A typical gully area of loess plateau region, Changwu County was selected as the study area. The organic matter input to farmland can be divided into four parts: the crop straw returned, the crop straw residues, the underground biomass from crop’s root, and the organic fertilizer applied. Based on the LANDSAT 5 satellite remote sensing data, the net primary productivity(NPP) based on CASA model was estimated, and then the total biomass of crop was acquired. Combined with the crop root/shoot ratio, the weights of crop biomass above ground and underground biomass were estimated. The weight of straw residues and straw returned were estimated by biomass above ground and the date obtained through field survey. The results showed that the total organic matter input to farmland was 42 700 t per year in the study area.更多还原