EFFECT OF FERTILIZATION AND AGRICULTURAL MANAGEMENT ON SOIL CARBON SEQUESTRATION AND NUTRIENT LOSSES

摘要

To mitigate the impacts of climate change on agricultural ecosystems, soil carbon sequestrationis to be enhanced and water degradation is to be prevented. In this study, the effects offertilizer types (chemical fertilizer and manure compost), cropping systems, and crop residuemanagement on SOC (Soil Organic Carbon) sequestration and nutrient losses in runoff wereinvestigated. Summer corn and winter barley were cultivated on experimental plots undernatural rainfall condition for two years. Four fertilizer treatments were laid out: control withoutfertilizer (CTL), chemical fertilizer (CF), manure compost at standard rate (OF1), and manurecompost at double standard rate (OF2). Soil and runoff samples were collected and analyzedfor SOC for soil and water quality constituents for water samples. The observed average SOCconcentrations were 2.79, 2.57, 4.90, 7.22 g C kg- -1 for CTL, CF, OF1, and OF2 treatments,respectively. The observed average T-N concentrations in soil were 0.41, 0.42, 0.50, 0.78g N kg -1, for CTL, CF, OF1, and OF2 treatments, respectively. The observed average T-Pconcentrations in soil were 0.67, 0.74, 0.78, 0.97 g P kg - -1 for CTL, CF, OF1, and OF2treatments, respectively.