Ecological Stoichiometry Between Leaves,Litter And Soil Of Dominant Species In The Forest Community Of Rock Stream Periglacial Landforms In Mt.laotudingzi

Based on the 13 dominant tree species,litter and soil of rock stream periglacial landforms forest in the Liaodong Mountain,the contents of C,N and P were analyzed by X-ray fluorescence spectrometry.The ecological stoichiometry was analyzed by statistical analysis.The following conclusions:(1)The content of C in the leaves of dominant tree species ranged from 14.273% to 24.951%.The content of N ranged from 0.521% to 1.396%.P is between 0.058% and 0.148%.Element measurement C:N is between 12.442 and 47.670;C:P is between 122.494~427.565;N:P is between 7.462 and 19.262.(2)The content range of semi-decomposed layer and full-decomposed layer C of litter under dominant trees was between 16.007%~26.628% and 24.195%~26.576%,respectively.N was between 0.566%~1.413% and 0.487%~1.168%,respectively.P is between 0.054%~0.157% and 0.057%~0.116%.With the decomposition of litter,the ratio of C:N and C:P increased,but there was no significant change in N:P.(3)The content of C in the 0-20 cm layer and the 20-40 cm layer of the soil under the dominant tree species ranged from 4.017% to 10.129% and 3.511% to 6.937%,respectively.N is between 0.527%~1.278% and 0.647%~1.023%.P is between 0.084%~0.163% and 0.075%~0.135%.C:N and C:P decreased with the increase of soil depth,and there was no significant change in N:P.(4)There was a significant negative correlation between the leaf P of dominant tree species and the semi-decomposed layer C of litter under the tree.Advantage tree leaf N,P and tree litter decomposition layer P and C: P,were significantly positive correlation and significant negative correlation.Leaf N of dominant tree species was significantly negatively correlated with soil layer(20-40cm)C:N.Advantage tree leaf N,P,respectively,and 20 ~ 40 cm soil layer P,C: N was significantly positively related to and significant negative correlation.In the semi-decomposed layer of litter under the tree,N and P were negatively correlated with C and N in the 0-20 cm layer of soil respectively,and positively correlated.There was a significant positive correlation between N:P in the whole decomposition layer of litter under trees and N:P in the 0-20 cm layer of soil and P in the 20-40 cm layer of soil,respectively.(5)Element P is the limiting nutrient element for the growth of plants in rock stream,and element C:P is the main factor that causes significant differences in the levels of soil nutrients and patterns among different tree species and litter under trees.The N and P contents and the C:P,N:P ratio of the leaves,litter under the trees,soil of the dominant tree species in the study area were relatively low,but the cycling transformation of nutrient elements between the plant body,litter and soil was rapid and stable.