巴音布鲁克主要草地类型表层土壤有机碳特征及其影响因素的研究

Organic Carbon Content in Major Grassland Types in Bayinbulak

以新疆天山中段巴音布鲁克主要草地类型为研究对象,分析了不同草地类型土壤有机碳(SOC)的分布特征及其与气候因子、植被特征和土壤特性的关系。结果表明:分布在盆地海拔最低处的高山沼泽化草甸的土壤有机碳含量最高,而分布在盆地中间海拔的高山草原最低,分布在较高海拔的高寒草甸和高山草原化草甸处于高山沼泽化草甸和高山草原之间。0-30cm土壤有机碳含量与空气相对湿度、草地生产力、植被盖度、土壤含水量呈显著正相关(P<0.05),与土壤容重、土壤紧实度、土壤pH呈显著负相关(P<0.05),土壤有机碳与温度存在一定负相关,但未达到显著水平。偏相关分析显示,影响表层土壤有机碳含量最主要的因素是土壤含水量、土壤紧实度、草地生产力、空气相对湿度。

This study analyzed soil organic carbon content （SOC） and factors affecting carbon distribution such as cli- mate, vegetation and soil properties in major types of grassland along the middle range of Tianshan mountain in Bayinbulak. Results indicated that soil organic carbon content was the greatest at the lowest site and greater at the highest site and the lowest at the middle site. According to the following order：alpine swamp meadow 〉 al- pine meadow 〉 alpine steppe meadow 〉 alpine steppe. Soil organic carbon in the 0 - 30cm of soil was positively correlated with relative humidity, plant productivity, plant cover, soil water content （ P 〈 0.05 ）, and negatively correlated with soil bulk density, soil compaction and soil pH （ P 〈 0.05 ）. In addition, soil organic carbon was poorer negatively correlated with the temperature. The most important factors affecting SOC in the 0 -30cm soil layer were soil water content, soil compaction, plant productivity and relative humidity.