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为探讨长期不同施肥条件下土壤颗粒有机碳和土壤酶活性的变化及其关系,对棕壤肥料长期定位试验地第27年耕层土壤的颗粒有机碳和主要酶活性进行了测定与分析。结果表明:长期施用有机肥显著提高土壤中的总有机碳(TOC)、游离态颗粒有机碳(FPOM-C)和闭蓄态颗粒有机碳(OPOM-C)含量及土壤颗粒有机碳POM-C/TOC和FPOM-C/OPOM-C。单施化肥使土壤的TOC含量有所增加,但显著降低了FPOM-C和OPOM-C含量及POM-C/TOC和FPOM-C/OPOM-C;长期施用有机肥显著提高土壤的过氧化氢酶、转化酶、脲酶和中性磷酸酶活性,且均随有机肥用量的增加而增加。单施化肥对土壤酶活性影响差异较大。相关分析结果显示:土壤的TOC、POM-C、FPOM-C和OPOM-C含量两两之间均呈现显著或极显著相关关系;土壤的TOC、POM-C、FPOM-C和OPOM-C含量与过氧化氢酶、转化酶、脲酶和中性磷酸酶活性之间存在密切关系。
In order to investigate the changes of soil organic carbon and soil enzyme activities under long-term different fertilization conditions and their relationships, the activities of soil particulate organic carbon and main enzymes in long-term fertilization for 27 years were measured and analyzed. The results showed that long-term application of organic manure significantly increased soil total organic carbon (TOC), free organic carbon (FPOM-C) and closed organic carbon (OPOM-C) content and POM- TOC and FPOM-C / OPOM-C. The single application of chemical fertilizers increased soil TOC content, but significantly reduced FPOM-C and OPOM-C contents as well as POM-C / TOC and FPOM-C / OPOM- Enzyme, Invertase, Urease and Neutral Phosphatase activities increased with the increase of organic manure. Fertilizers on soil enzyme activity vary greatly. Correlation analysis showed that soil TOC, POM-C, FPOM-C and OPOM-C contents all showed significant or extremely significant correlations; soil TOC, POM-C, FPOM-C and OPOM-C There is a close relationship between catalase, invertase, urease and neutral phosphatase activities.