长期施肥对土壤活性有机碳指标的影响

Long-term Fertilization on Indicators of Soil Active Organic Carbon

以棕壤长期肥料定位试验地土壤为试材,研究和对比了不同施肥处理耕层土壤各项活性有机碳指标对长期施肥的响应。研究结果表明,长期施用化肥、有机肥以及有机肥配施化肥均显著改变了土壤总有机碳(TOC)含量。与此同时,土壤的轻组有机碳(LFOC)、易氧化有机碳(ROC)和微生物量碳(MBC)含量亦对长期施肥产生与TOC基本一致的响应。相关分析结果表明,土壤的LFOC、ROC和MBC可以作为长期施肥对土壤TOC影响的评价指标,且三者的指示灵敏度依次为MBC>LFOC>ROC。

The study on responses of soil active organic carbon indicators to long-term fertilizations was conducted in a long-term fertilizer located field experiment in a brown earth in northeast China. The results showed that long-term applications of chemical fertilizer, organic fertilizer or combined them significantly changed soil total organic carbon （TOC）. Meanwhile, soil light fraction organic carbon （LFOC）, readily oxidizable carbon （ROC） and microbial biomass carbon （MBC） had the same response to the long-term fertilizations with TOC. Correlation analysis indicated that, soil LFOC, ROC and MBC can be indicators for assessing effect of long-term fertilization on soil TOC, with more sensitive responses to long-term fertilizations than TOC, and the sensitivity of them followed as MBC 〉 LFOC 〉 ROC.