为了了解黄河中游不同气候类型区灌草丛碳密度的差异,以山西省黄河中游三个不同的气候(亚)区为研究对象,在详细调查的基础上,设置临时标准地,对灌木、草本、细根和土壤的碳密度进行测定分析,结果表明:灌草丛植被碳密度在黄河中游有明显的变化趋势,由北向南随着温度和降水的增加,植被的碳密度显著增加,同时草本的碳密度高于灌木的碳密度;灌木层的地上部分和地下部分所占的比例差异较大,草本的地上部分和地下部分的碳密度差异较小,草本层地上与地下部分的分配格局与灌木的分配格局基本一致;土壤有机碳主要分布于0~20cm深度范围内,北部、中部和南部土壤碳密度均随着土壤深度增加而下降,南部土壤碳密度显著高于北部。

In order to understand the differences of carbon density of shrub and grass in the middle reaches of the Yellow River in different climate types,three different climate(sub) areas in Shanxi province were chosen as the research objects on the basis of detailed investigation.In the typical area of each of three different climate(sub) areas the carbon density of shrubs,grass,their fine roots and surrounding soils was determined.The results showed that the trend of variation of carbon density of shrub and grass vegetation was evident from north to south in the middle reaches of the Yellow River with an increase in temperature and precipitation.The vegetation carbon density increased significantly and the carbon density of grass was higher than that of shrub;the carbon density difference in shrub between the ground and underground parts was bigger,whereas the carbon density difference in grass between the ground and underground parts was smaller.Moreover,the distribution pattern of shrub and grass between the ground and underground parts were similar.The soil organic carbon was mainly distributed in the 0~20 cm range of depth.In the northern,central and southern parts soil carbon density decreased with the increase of soil depth and soil carbon density in southern part was significantly higher than that in the northern part.