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首页> 外文期刊>Ecological research >Whole-canopy nitrogen-use efficiency of pioneer species in early secondary forest succession in Vietnam
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Whole-canopy nitrogen-use efficiency of pioneer species in early secondary forest succession in Vietnam

机译：越南次生森林演替过程中先驱物种全冠层氮利用效率

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摘要

The size hierarchy among plants during forest succession can be influenced by differences in nitrogen-use efficiency (NUE). During succession, soil nitrogen availability decreases, which increases the importance for species to use nitrogen efficiently. We compare whole-canopy-NUE and its underlying traits among pioneer species in a tropical forest over the first years of succession. At the leaf level, potential photosynthetic NUE (PPNUE: light-saturated photosynthetic rate/leaf N content) was partly positively correlated with species growth rate but not to species height. Canopy-NUE differed two-fold among species. The species with the highest PPNUE and growth rate but with a small stature had a high canopy-NUE and the tallest species had a low canopy-NUE. Differences in canopy-NUE appeared to be largely determined by leaf life span (LLS) and nitrogen resorption. A high LLS or a high resorption resulted in a high mean residence time of nitrogen and thus a high canopy-NUE. Canopy-NUE of a species was different between successional stands that differed in age and thus in height, leaf-area index, and resource availability. Thus, an increase in competitive pressure with succession did cause some changes in the use of nitrogen, except for one species. Species that are generally considered part of the same functional group (pioneer trees) can differ considerably in NUE and its underlying traits.
机译：森林演替期间植物之间的大小等级可能会受到氮利用效率（NUE）差异的影响。在演替过程中，土壤氮素利用率下降，这增加了物种有效利用氮素的重要性。在继承的最初几年中，我们比较了热带森林中先驱物种之间的全冠NUE及其基本特征。在叶片水平上，潜在的光合NUE（PPNUE：光饱和光合速率/叶N含量）与物种生长速率呈正相关，但与物种高度无关。冠层-NUE在物种之间有两倍的差异。 PPNUE和生长速率最高但身材矮小的物种具有较高的冠层NUE，最高的物种具有较低的冠层NUE。冠层NUE的差异似乎主要取决于叶片寿命（LLS）和氮吸收。较高的LLS或较高的吸收率会导致较高的氮平均停留时间，从而导致较高的冠层NUE。在年龄，高度，叶面积指数和资源利用率上不同的演替林之间，物种的冠层NUE也有所不同。因此，除了一个物种外，竞争压力的连续增加确实导致氮的使用发生一些变化。通常被认为是同一功能组（先锋树）一部分的物种在NUE及其基本特征方面可能有很大差异。

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