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通过长期田间定位试验,研究了各级土壤团聚体中不同形态有机碳的分布模式,以及耕作方式的影响.实验结果是:两种耕作方式下,土壤总有机碳(TOC)、DOC和POC在>2.0 mm粒级到<0.053 mm粒级团聚体中,均呈倒V字形分布,具有相同的分布模式,且主要富集在2.0~0.25 mm团聚体中.结果表明:土壤团聚体中各种形态的有机碳在不同大小团聚体中的分布模式主要由土壤团聚体本身的性质决定,耕作方式的影响不显著;常规耕作降低了土壤中有机碳的含量,垄作免耕则能有效地保护土壤中的有机碳.
Through long-term field experiment, the distribution patterns of different forms of organic carbon in soil aggregates and the effects of farming methods were studied.The results are as follows: TOC, DOC and POC under the two tillage patterns > 2.0 mm grain size to <0.053 mm aggregates with inverted V-shaped distribution and the same distribution pattern, and mainly concentrated in 2.0 ~ 0.25 mm aggregates.The results showed that all kinds of aggregates The distribution patterns of organic carbon in aggregates of different sizes were mainly determined by the nature of soil aggregates and the effect of farming methods was not significant. Conventional tillage decreased the content of organic carbon in soil, while ridge tillage was effective in protecting soil In the organic carbon.