高寒草地土壤碳储量垂直分布特征——以昌都市为例

Vertical Distribution Characteristics of Soil Carbon Storage in Alpine Grassland——Take Changdu City as an Example

通过比较[0,5]cm、(5,15]cm、(15,30]cm、(30,60]cm、(60,100]cm、(100,200]cm不同土层厚度的土壤碳储量分布比例规律,分析草地类、海拔、坡向、坡度对土壤碳储量垂直结构的影响,开展草地土壤碳储量垂直结构分析和水平差异分析,最终为高寒地区开展草地土壤碳储量样地调查的土壤深度设置提供理论依据。研究结果表明:随土层深度的增加,昌都市草地土壤碳储量逐渐减少;草地土壤碳储量主要分布在0~60 cm土层中,占总量的86.12%;草地土壤碳储量垂直结构在空间水平上无明显差异,且草地类、坡向、坡度等因子对土壤碳储量垂直分布的影响较小,但海拔对土壤碳储量垂直分布有一定的影响。

By comparing the distribution ratio of soil carbon storage with different soil thicknesses[O,5]cm,(5,15]cm,(15,30]cm,(30,60]cm,,(60,100]cm,(100,200]cm,the effects of grassland type,altitude,aspect,and slope on the vertical structure of soil carbon storage were analyzed.The vertical structure analysis and horizontal difference analysis of grassland soil carbon storage were carried out,and a theoretical basis for the soil depth setting of grassland soil carbon storage sample plot survey in the alpine region was provided.The results showed that the soil carbon storage in the grassland of Changdu gradually decreased with the increase of soil depth,and the soil carbon storage in the grassland was mainly distributed in the soil layer with a depth of 0~60 cm,accounting for 86.12%of total soil carbon storage.There was no significant difference in the vertical structure of soil carbon storage in grassland at the spatial level,and the factors of grassland type,aspect,and slope had litle impact on the vertical structure of soil carbon storage.Still,altitude had a certain effect on the vertical structure of soil carbon storage.