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以黑河中游7种典型土地利用方式(水田、旱地、中覆盖度草地、盐碱地、裸土地、戈壁和沙地)为对象,分析土壤有机碳含量及其组分的关系.结果表明:在0～100cm土壤中,随土层深度增加,土壤总有机碳(TOC)、活性有机碳(AOC)和非活性有机碳(NOC)含量逐渐降低.中覆盖度草地、盐碱地、裸土地、戈壁、沙地、水田和旱地中的TOC、AOC、NOC含量不同,土地利用方式的改变将引起土壤有机碳的增减,水田耕作是提高绿洲土壤有机碳的有效途径.当土地利用方式变化后,NOC对TOC含量的贡献大于AOC.同一种土地利用类型中,随TOC含量的增加,AOC、NOC含量也呈增加趋势,且NOC的增幅高于AOC.AOC、NOC变化趋势线的交叉点对应的TOC含量可作为土壤中TOC易积累或易损失的分界点,AOC、NOC的饱和容量可通过其变化趋势线来确定.
The relationship between soil organic carbon content and its components was analyzed with seven typical land use patterns (paddy field, dry land, middle coverage grassland, saline soil, bare land, Gobi desert and sandy land) in the middle reaches of the Heihe River.The results showed that in 0-100cm The content of TOC, AOC and NOC decreased with the increase of soil depth in the soil, while the content of soil organic carbon (TOC), soil active carbon (NOC) The contents of TOC, AOC and NOC in paddy field and dry land are different, and the change of land use pattern will lead to the increase and decrease of soil organic carbon, and paddy field farming is an effective way to increase soil organic carbon in oasis.When the land use pattern changes, The contribution of AOC and NOC increased with the increase of TOC content, and the increase of NOC was higher than that of AOC. The TOC content corresponding to the intersection of AOC and NOC trend line can be used as Soil TOC accumulation or easy loss of the demarcation point, AOC, NOC saturation capacity can be determined by the trend line.