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以我国川中丘陵区紫色土为背景,研究了5种不同土地利用方式对土壤活性有机碳(可溶性有机碳和微生物量碳)含量的影响,分析了可溶性有机碳(DOC)、微生物量碳(MBC)、总有机碳(TOC)的关系。结果表明,土地利用方式对土壤活性有机碳有显著影响。DOC含量呈现菜地>果园>水田>林地>旱地的趋势;MBC含量为水田>果园>菜地>林地>旱地。有机物质的输入量、种植制度和土壤管理措施是差异存在的重要原因。菜地、旱地、林地、果园和水田的DOC/TOC均值分别为0.58%、0.28%、0.19%、0.57%和0.28%,其相应的MBC/TOC均值分别为3.57%、3.09%、2.38%、2.67%和3.42%。经相关性分析,5种土地利用方式DOC、MBC含量与TOC之间的差异性达到了显著或极显著水平。
Based on the purple soil in the hilly area of central Sichuan, the effects of five different land use types on the contents of soil active organic carbon (dissolved organic carbon and microbial biomass carbon) were studied. The effects of dissolved organic carbon (DOC), microbial biomass carbon ), Total organic carbon (TOC). The results showed that the land use patterns had a significant effect on soil active organic carbon. DOC content showed the trend of vegetable land> orchard> paddy field> woodland> dry land; MBC content was paddy field> orchard> vegetable field> woodland> dry land. The input of organic matter, planting system and soil management measures are the important reasons for the difference. The DOC / TOC mean values of vegetable land, dry land, woodland, orchard and paddy field were 0.58%, 0.28%, 0.19%, 0.57% and 0.28%, respectively. The corresponding MBC / TOC mean values were 3.57%, 3.09% and 2.38% 2.67% and 3.42% respectively. Through the correlation analysis, the differences of DOC, MBC content and TOC of five kinds of land use patterns reached significant or extremely significant level.