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作 者 ：高三平,李俊祥,徐明策,陈熙,戴洁

期 刊 ：生态学报 2007年 27卷 3期 页码：947~952

关键词：常绿阔叶林；演替阶段；叶片N∶P化学计量学；限制性营养元素；

Keywords:evergreen broad-leaved forest, successional stage, leaf N and P stoichiometry, limitative nutrient,

摘 要 ：对天童常绿阔叶林5个演替阶段的13个种类24个植物个体叶片的N、P化学计量学的研究表明：（1）各演替阶段植物叶片的N、P含量变异较大，N含量的值在6.49～14.69 mg g^-1之间，P含量的值在0.66～1.13 mg g^-1之间，叶片的N∶P值在7.45～16.38之间；总体平均值N为9.43mg g^-1，P为0.86 mg g^-1，N∶P为11.17;（2）演替后期的叶片N含量和N∶P比高于演替前期，叶片N含量的变化趋势与N∶P比的变化趋势协同性较好，N∶P的变化趋势能较好地反映不同演替阶段的群落变化特征;（3）叶片N∶P可以作为植物和演替阶段的限制性营养元素的指标，不同演替阶段的群落生长基本上均是受N而不是受P的限制；演替各阶段绝大多数物种新生叶的N∶P都小于成熟的营养叶的N∶P，两者均受N元素的限制，且氮素对新叶的限制性更强，表明新叶容易缺乏氮素而发育不良。

Abstract:The leaf N and P stoichiometry of 24 individuals of 13 plant taxa in five various successional stages of the evergreen broad-leaved forest in Tiantong National Forest Park, Zhejiang Province was studied. The results showed that (1) leaf N, P and N∶P mass ratio exhibited large variations, ranging from 6.49 to 14.69 mg g^-1 for N, from 0.66 to 1.13 mg g^-1 for P, and from 7.45 to 16.38 for N∶P ratio. The arithmetic means for all species were 9.43 for leaf N and 0.86 mg g^-1 for leaf P, and 11.17 for N∶P, respectively; (2) Leaf N content and N∶P ratio in earlier successional stages were higher than those in later successional stages, the temporal change in leaf N corresponded well with that of leaf N∶P ratio, and the change in leaf N∶P ratio could be explained in terms of the characteristics of the communities in different successional stages; (3) Leaf N∶P stoichiometry can be used as an ecological indicator for nutrient limitation both at the plant individual and community levels. The N∶P ratio in new leaves was lower than that in mature leaves for most plant species, indicative of N-limitation but not P-limitation. New leaves more frequently suffered from N-limitation than mature leaves, and thus were subject to leaf hypogenesis in the shortage of N nutrient supply.

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