赤峰地区杨树人工林土壤碳储量分布特征研究

Distribution Characteristics of Soil Carbon Storage in Poplar Plantation in Chifeng

为科学掌握内蒙古赤峰地区杨树人工林不同土壤类型、不同龄组林分土壤碳储量的分配特征及变化规律,以赤峰市敖汉旗新惠林场的杨树人工林土壤为研究对象,对土壤有机碳含量及土壤容重进行测定,结果表明:(1)土壤有机碳含量随深度的变化,呈指数变化,拟合方程为y=1 050.4e0.2425x,R2=0.9463;(2)土壤有机碳含量随着土壤深度的逐渐增加而呈现逐渐减小的趋势,且表层土壤有机碳含量最高;(3)土壤碳密度随着土壤深度的逐渐增加呈现凹字型的趋势;(4)随造林年限的增加,1 m内土层碳密度、土壤碳储量总体呈现增加趋势,过熟林后呈下降趋势。

In order to grasp the distribution characteristics and change rules of soil carbon storage in poplar plantations in different soil types and different ages,taking the soil of poplar plantations in Xinhui Forest Farm in Aohan Banner,Chifeng as the study object,the organic carbon content and soil bulk density have been measured. The results show,（ 1） Soil organic carbon content shows index change with the change of depth,and the fitting equation is y = 1 050. 4e^0. 2425 x,R^2= 0. 9463.（ 2） Soil carbon content decreases with the increases of soil layer,and the soil organic carbon content in the surface catch up to the maximum.（ 3） Soil carbon density shows concave-shaped trend with the increase of soil depth.（ 4） With the increase of forestation age,soil carbon density and soil carbon storage within 1 m show an overall increase in trends,but it declines after overmature forest.