天童常绿阔叶林不同演替阶段常见种叶片N、P化学计量学特征  

Leaf N and P Stoichiometry of common species in successional stages of the evergreen broad-leaved forest in Tiantong National Forest Park, Zhejiang Province,China

作　　者：高三平[1] 李俊祥[1] 徐明策[1] 陈熙[1] 戴洁[1] 

机构地区：[1]华东师范大学环境科学系

出　　处：《生态学报》2007年第3期947-952,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30400050);国家自然科学基金重点资助项目(30130060);华东师范大学"211"生态学重点学科资助项目~~

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6.49~14.69mgg^-1之间,P含量的值在0.66~1.13mgg^-1之间,叶片的N∶P值在7.45~16.38之间;总体平均值N为9.43mgg^-1,P为0.86mgg^-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。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 ^-1forP, and from 7. 45 to16. 38 for N：P ratio. The arithmetic means for all species we＇re 9. 43 for leaf N and 0. 86 mg g 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 thechange 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.

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 

分 类 号：Q948[生物学—植物学] Q946