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2014年5~9月,以尕海湿地沼泽化草甸中不同积水区(无积水区、季节性积水区和常年积水区)的土壤为研究对象,测定土壤中的活性有机碳含量,分析沼泽化草甸不同积水区土壤活性有机碳组分差异。研究结果表明,积水状况对土壤活性有机碳组分影响显著。0~40 cm深度土壤活性有机碳含量最大值出现在常年积水区,季节性积水区的土壤活性有机碳含量次之,最小值出现在无积水区。在不同土壤深度,20~40 cm深度土壤有机碳和微生物量碳含量在季节性积水区最大,在无积水区最小,其它深度土壤有机碳、微生物量碳和易氧化有机碳含量都在常年积水区最大,在无积水区最小,说明常年积水区活性有机碳及组分具有更加明显的表聚性。在不同采样日,各积水区的土壤有机碳、微生物量碳、微生物熵和易氧化有机碳含量都有显著变化(p<0.05)。各活性有机碳组分与土壤有机碳含量显著正相关(p<0.01),各活性有机碳含量都随着土壤有机碳含量增加而增加。
From May to September 2014, the soil samples collected from different areas (no water area, seasonal water area and perennial water area) in the marsh meadow of Gahai wetland were used to determine the content of active organic carbon Content, analyze the difference of soil active organic carbon in different water storage areas of swamp meadow. The results show that the effect of water accumulation on soil active organic carbon components is significant. The maximum values of soil active organic carbon in the depth of 0 ~ 40 cm appeared in the perennial stagnant water area, followed by the soil active organic carbon in the seasonal water catchment area, and the minimum appeared in the no-water area. At different soil depths, the contents of soil organic carbon and microbial biomass carbon in the depth of 20 ~ 40 cm were the largest in the seasonal water catchment area and the smallest in the no-water catchment area. The contents of soil organic carbon, microbial biomass carbon and organic carbon in the soil were The largest annual catchment area and the smallest catchment area, indicating that the active organic carbon and components in the perennial catchment area have more apparent surface aggregation. The soil organic carbon, microbial biomass carbon, microbial biomass entropy and soil organic carbon content in each catchment area all changed significantly on different sampling days (p <0.05). There was a significant positive correlation between each organic carbon fraction and soil organic carbon (p <0.01), and the content of each active organic carbon increased with the increase of soil organic carbon content.