Response of Carbon,Nitrogen and Phosphorus to Nitrogen Deposition in Fine Roots of Hippophae rhamnoides in Western Sichuan Plateau

In this paper,analysis was made of the biomass allocation,carbon,nitrogen and phosphorus content in fine roots of Hippophae rhamnoides under nitrogen deposition in Western Sichuan Plateau.The results showed that:(1) nitrogen deposition had a significant promotion effect on the total biomass of fine roots,mainly displaying that of the coarser roots; (2) there was no significant change in the total nitrogen content of fine roots under nitrogen deposition,and the total phosphorus content decreased significantly,which made the total C/P and N/P significantly increase; (3) the results of chemical measurement showed that the nitrogen content was relatively lower,whereas the phosphorus content was relatively higher,thus the growth of fine roots might be limited by nitrogen.