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Leaf nitrogen and phosphorous stoichiometry of trees in Pinus tabulaeformis Carr stands,North China

2012; Science Press; Linguagem: Inglês

1672-352X

Jihua Hou,

Forest ecology and management

Nitrogen(N) and phosphorous(P) stoichiometry in plant leaves have been studied intensively with recent focus on large-scale patterns and driving mechanisms.An experiment was conducted in Hei Lihe of Inner Mongolia Autonomous Region,Song Mountain of Beijing and Taiyue Mountain of Shanxi Province to understand the N and P stoichiometry between Pinus tabulaeformis and broad-leaf trees in nature Pinus tabulaeformis Carr.Leaf stoichiometry showed large variations with N ranged from 0.9344% to 4.8987%,P from 0.0790% to 0.6555%,and N/P from 3.6328 to 35.4302.N and P were significantly and positively correlated(r=0.589,P0.01),and P was significantly and negatively correlated to N/P(r=﹣0.618,P0.01).N and P contents of Pinus tabulaeformis were lower than that those observed for broad-leaf trees in three sites.This implies that broad-leaf trees have higher N and P storage capacity than Pinus tabulaeformis.N/P in Pinus tabulaeformis and in broad-leaf trees differed significantly(P0.01) in Hei Lihe.The mean concentrations of N and P for Pinus tabulaeformis ranked in the order of Taiyue Mountain Hei Lihe Song Mountain,while ranked as Hei Lihe Song Mountain Taiyue Mountain for broad-leaf trees.The result reveals that Pinus tabulaeformis has the high N and P storage capacity in Taiyue Mountain and that broad-leaf trees has high N and P storage capacity in Hei Lihe.