Effects of Larix principis -rupprechtii plantation density control on soil organic carbon and nutrients characteristics
The Larix principis- rupprechtii plantations of different stand densities （740, 1480, 2000 and 2170 tree · hm^2, respectively） in rocky mountain area of northern China were selected to study SOC content anddensity, nutrient characteristics and their correlations. The results were showed as the followings： 1 ） With the increase of soil depth, SOC content and density decreased significantly; 2） When the stand density increased to 2170 trees· hm^2 the SOC content and density reached the maximum of 25.45g · kg^-1 and 15.68kg· hm^2respectively, and there existed significant differences between 2170 trees· hm^2 and 740 trees· hm^2; 3 ） The variations of nutrients were not consistent when the stand density increased from 740 trees · hm^2 to 2170 trees· hm^2. At the stand density of 2170 trees· hm^2, total N, total P and rapidly available K contents were in rela- tively higher levels in the soil depth of 0 - 60cm, but higher contents of total K and available P were only found in the depth of 0 -20cm; 4） In the whole soil profile, the SOC content and density had very significant or signif-icant positive correlations with total N, total P and rapidly available K contents ; 5 ） The stand density of Larix principis - rupprechtii plantation was suggested to be about 2170 trees · hm^2 for the soil carbon sequestration.
NETL
NSTL
万方数据
维普
