土壤活性有机碳·养分有效性与作物产量的关系

以吉林省德惠市的典型黑土为主要研究对象,分析了2001～2003年不同耕作施肥措施下,土壤活性有机碳、速效养分和作物产量的变化规律及其相互关系,探讨了土壤活性有机碳在土壤肥力中的地位及与其他养分间的关系。结果表明:从2001年起土壤活性有机碳、土壤有效养分和作物产量均呈增加的趋势;土壤活性有机碳的不同类型对土壤养分的有效性贡献不同,易氧化有机碳与碱解氮之间呈极显著的正相关(r0.01=0.403**),而微生物量碳与速效磷间也呈正相关(r0.05=0.312);易氧化有机碳与土壤速效钾间呈显著的负相关(r0.05=-0.537**);而微生物量碳与土壤速效钾间呈正相关(r0.05=0.428);作物产量与土壤易氧化有机碳呈显著的正相关,与土壤碱解氮、速效磷、速效钾的相关性不显著。

Relationship between Active Soil Organic Carbon, Nutrient Bioavailability and Crop Yield

Average crop yield,active soil organic carbon,soil available nutrient content and their relationship were studied.The study result indicated that both active soil organic carbon and soil available nutrient content took on an increasing tendency in crop yield-increasing.The contribution of different types of active soil organic carbon to soil available nutrients was different.There was an obvious positive relationship between LOC and SAN(r0.01=0.403**),a positive relationship between MBOC and SAP(r0.05=0.312)and an significant negative relationship between LOC and SAK(r0.05=-0.537**).There existed an significant positive relationship between MBOC and SAK(r0.05=0.428)and an obvious positive relationship between crop yield and LOC.There was no relationship between crop yield and SAN,SAP and SAK,respectively.