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选取江西省安福县15年撂荒地和3种林地(毛竹林人工林、木荷次生林、杉木人工林),研究土地利用方式改变对土壤有机碳库以及活性有机碳的影响.结果表明:不同样地的土壤总有机碳、微生物生物量碳、热水浸提有机碳和易氧化态碳均表现为毛竹人工林>杉木人工林>木荷次生林>撂荒地;与对照(撂荒地)相比,3种林地的土壤有机碳含量、碳储量及活性有机碳含量均随土壤深度增加而递减,表层富集现象明显;不同土壤活性有机碳的分配比例明显不同,其中,土壤易氧化态碳占总有机碳的比例最大,微生物生物量碳所占比例最小,土壤总有机碳、微生物生物量碳、热水浸提有机碳和易氧化态碳间的相关性均达到极显著水平.后三者表征了土壤中活性较高部分碳的含量,对土地利用方式的响应较敏感,可以作为评价赣中地区土壤质量和肥力的指标之一.
The 15 years fallow land and 3 kinds of forest land in Anfu County, Jiangxi Province were selected to study the effects of land use change on soil organic C and active organic carbon. Soil total organic carbon, microbial biomass carbon, organic carbon extracted by hot water, and readily oxidizable carbon all showed bamboo plantation> Chinese fir plantation> Schima superba forest> abandoned land. Compared with the control (abandoned land) The contents of soil organic carbon, carbon storage and active organic carbon in three kinds of forestland all decreased with the increase of soil depth, and the surface enrichment was obvious. The distribution proportion of active organic carbon in different soil was obviously different, among which, The proportion of organic carbon was the largest, the proportion of microbial biomass carbon was the smallest, and the correlation between soil total organic carbon, microbial biomass carbon, organic carbon extracted by hot water and readily oxidizable carbon reached extremely significant level. The content of carbon in the higher activity part of soil is more sensitive to the response of land use, which can be used as an index to evaluate soil quality and fertility in the middle Jiangxi Province.