草原及开垦后土壤有机质性质研究

Properties of organic matter in natural and reclaimed steppe soil

从土壤有机无机复合状况、腐殖质结合形态和腐殖质组成等方面 ,研究了供试土壤 (草原淡黑钙土、草原风沙土和已开垦的风沙土 )有机质的性质 .结果表明 ,不同土壤类型及利用方式对土壤有机质性质的影响有很大的差异 .与风沙土相比 ,淡黑钙土的全土碳、生物量碳、重组碳、可提取腐殖物质 (HE)、松结态腐殖质的含量和全土腐殖化度较高 .风沙土种向日葵后其全土碳、生物量碳、重组碳和HE含量及各种结合形态腐殖质含量均下降 ,但腐殖化程度相差不大 .

The properties of organic matter in steppe chernozem,steppe wind-blown soil and cultivated wind-blown soil were studied by analyzing the status of organo-mineral complex and the combined status and composition of humus.The results showed that different types and utilization patterns of soil had very different effects on the properties of soil organic matter.The amounts of total organic carbon,biomass C,heavy fraction C,extractable humus (HE) and loosely-combined humus and the humification degree were higher in steppe chernozem than in wind-blown soil.Steppe soil had higher amounts of total organic carbon,biomass C,heavy fraction C,HE and different combined humus than sunflower wind-blown soil,but humification degree had no obvious difference.