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以湖南省3个国家级稻田肥力变化长期定位监测点的土壤作为研究材料,测定了不施肥、单施化肥、化肥配施有机肥等施肥处理的土壤总有机碳、水溶性有机碳、易氧化有机碳及微生物量碳的含量及其相互关系。结果显示,3个监测点化肥配施有机肥处理土壤总有机碳、易氧化有机碳、微生物量碳和水溶性有机碳的含量均显著高于不施肥的对照处理,增幅分别为12.59%～82.84%、15.33%～103.95%、35.33%～97.54%、15.89%～73.73%;易氧化有机碳、微生物量碳和水溶性有机碳占总有机碳比中的变化范围分别为49.02%～58.31%、1.93%～3.46%和0.10%～0.15%,处理间差异性不太显著,其中桃江点的微生物量碳和水溶性有机碳占总有机碳的比率显著低于其它两监测点;总有机碳、易氧化有机碳、微生物量碳及水溶性有机碳之间相关性均达到极显著水平。
Soil samples from three national long-term paddy field fertility monitoring sites in Hunan Province were used as experimental materials to determine the contents of soil total organic carbon, water-soluble organic carbon, and organic fertilizer with no fertilization, chemical fertilizer alone and chemical fertilizer combined with organic fertilizer. Organic Carbon and Microbial Biomass Carbon Content and Their Relationship. The results showed that the contents of total organic carbon, organic carbon, microbial biomass carbon and water-soluble organic carbon in soil treated with three kinds of chemical fertilizers with organic fertilizers were significantly higher than those without fertilizers at the three monitoring sites, with the increasing rates of 12.59% -82.84 %, 15.33% ~ 103.95%, 35.33% ~ 97.54% and 15.89% ~ 73.73%, respectively. The ranges of the contents of organic carbon, microbial biomass carbon and water-soluble organic carbon were 49.02% -58.31% 1.93% ~ 3.46% and 0.10% ~ 0.15% respectively. The difference between treatments was insignificant. The ratio of microbial biomass carbon and water-soluble organic carbon to total organic carbon in Taojiang Point was significantly lower than that of other two monitoring sites. Total organic carbon, The correlations between EOX, C biomass and water-soluble organic carbon all reached the extremely significant level.