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
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Q948.1

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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
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    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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高三平,李俊祥,徐明策,陈熙,戴洁.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.生态学报,2007,27(3):947~952

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