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以江西鄱阳湖区双季稻田施肥效应和土壤肥力变化长期定位试验为对象,研究了长期施肥条件下鄱阳湖区双季稻田土壤有机碳(SOC)的变化规律。结果表明,不施肥或缺施N、P处理均造成SOC含量显著降低,而有机无机肥配施均促进SOC含量显著提高,且SOC含量随有机肥配施比例提高而增加;土壤有机碳储量随着外源有机碳投入的增加而增加,且随着试验年限延长,土壤有机碳储量逐渐升高;土壤有机碳储量年均变化量与外源碳年均投入量呈显著正相关关系。说明外源碳的投入有利于促进土壤有机碳含量和储量的提升。
Taking the long-term fertilization effect and long-term fertilization effect of double cropping paddy field in Poyanghuji of Jiangxi as an example, the variation law of soil organic carbon (SOC) in double cropping paddy field in Poyang Lake area under long-term fertilization was studied. The results showed that without or without N and P treatment, the content of SOC decreased significantly, while the combination of organic and inorganic fertilizers promoted the content of SOC significantly increased, and the content of SOC increased with the proportion of organic manure; With the increase of input of exogenous organic carbon, soil organic carbon storage increased gradually with the prolongation of test period. The annual average change of soil organic carbon storage was positively correlated with the annual input of exogenous carbon. It shows that the input of exogenous carbon is conducive to promoting the increase of soil organic carbon content and reserves.