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溶解性有机碳含量在土壤有机质中所占的比例很小,但却是土壤有机质中最为重要和活跃的部分。分别选取安徽省芜湖市区附近4种土地利用方式下(农田、菜地、林地、荒地)的土壤为研究对象,研究了不同利用方式下土壤溶解性有机碳含量及其剖面分布规律,为了解溶解性有机碳在土壤生态系统碳循环中的作用,探讨土壤溶解性有机碳与土壤肥力及培肥措施的关系提供理论依据。结果表明:土壤溶解性有机碳含量在土壤表层最高,随着土层深度增加有明显减小的趋势。土地利用方式对土壤溶解性有机碳含量有明显影响,4种土地利用方式下土壤的溶解性有机碳含量有很大差异,大小顺序为农田>林地>菜地>荒地。这说明土壤溶解性有机碳含量与土壤肥力有关,可以作为评价土壤肥力的生物学指标。
Dissolved organic carbon is a small proportion of soil organic matter, but it is the most important and active part of soil organic matter. Four soil types (farmland, vegetable field, woodland and wasteland) near the urban area of Wuhu, Anhui Province were selected as the research object. The contents of soil dissolved organic carbon and its distribution under different utilization patterns were studied. The role of dissolved organic carbon in soil ecosystem carbon cycle and the relationship between soil dissolved organic carbon and soil fertility and soil fertility are discussed. The results showed that the content of soil dissolved organic carbon was the highest in the surface layer of soil, and decreased with the depth of soil layer. Land use types had significant effects on soil dissolved organic carbon content. There were significant differences in soil dissolved organic carbon under four land use types, with the order of farmland> forest land> vegetable field> wasteland. This indicates that the soil dissolved organic carbon content is related to soil fertility and can be used as a biological indicator to evaluate soil fertility.