不同林龄平茬沙柳固碳量及其与生长因子的关系研究

文章以库布齐沙漠人工沙柳林为研究对象,研究不同立地条件下5a、10a、15a沙柳固碳量,固碳量与沙柳丛高、冠幅、基径、基部枝条粗度、基部分枝数、单枝最大分枝数、单枝最大枝芽数这7项生长因子的关系。主要结论如下:①从固碳量来看,平茬3次的15 a沙柳沙柳固碳量(9.45 kg·株^-1)>平茬2次的10 a沙柳沙柳固碳量(4.74 kg·株^-1)>平茬1次的5 a沙柳沙柳固碳量(1.79 kg·株^-1),三者差异显著(P<0.05)。②从沙柳不同生长因子与固碳量能力的墓函数分析来看,基部分枝数(用=0.6154)、枝条基部粗度(R^2=0.6032)、基径(R^2=0.6022)、冠幅(R^2=0.5648)、丛高(R^2=0.4693)与固碳量的关系较高。③不同立地条件下,丘间低地沙埋下沙柳固碳量及各生长因子的生长状况优于迎风坡风蚀和丘间低地未沙埋条件下。

Relationship Between Carbon Sequestration and Growth Factorsof Salix Psammophila at Different Forest Ages and Stumping Time

Taking artificial Salix psammophila forest in Kubuqi Desert as the research object,this paper studied the carbon sequestration of Salix psammophila under different site conditions for 5 a,10 a and 15 a,and the relationship between carbon sequestration and seven growth factors,namely,height of Salix psammophila bush,crown width,basal diameter,basal branch diameter,basal branchnumber,maximum branch number per branch and maximum bud number per branch.The main conclusions are as follows:①In terms of carbon sequestration,the carbon sequestration of Salix psammophila(9.45 kg per plant^-1)in 15 years after three times of flat stubble>that of Salix psammophila(4.74 kg per plant^-1)in 10 years after two times of flat stubble>that of Salix psammophila(1.79kg per plant^-1)in 5 years after one time of flat stubble,the difference is significant(P<0.05).②According to the power function analysis of different growth factors and carbon sequestration capacity of Salix psammophila,the number of base branches(R^2=0.6154),branch base coarseness(R^2=0.6032),basal diameter(R^2=0.6022),crown width(R2=0.5648),cluster height(R^2=0.4693)have a higher relationship with carbon sequestration.(3)Under different site conditions,the carbon sequestration and growth of growth factors of Salix psammophila under sand burial in inter-dune lowland were better than those under wind erosion on windward slope and nonsand burial in inter-dune lowland.