Generality of leaf traits relationships of dominant species along the secondary succession in the Loess Plateau of China

Generality of leaf traits relationships of dominant species along the secondary succession in the Loess Plateau of China
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中国黄土高原次生演替优势种叶片性状关系的一般性

DOI:
10.5897/ajb11.1272
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发表时间:
2012-01
影响因子:
--
通讯作者:
上官周平Zhouping Shangguan
上官周平Zhouping Shangguan
中科院分区:
--
文献类型:
--
作者:
安慧 Hui An;上官周平Zhouping Shangguan

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研究了黄土高原4个次生演替组18种优势植物的比叶面积(SLA)、叶片光合速率(Pn)、叶片氮含量(Nm和Na)和氮素利用效率(PNUE)。不同次生演替组间叶片比叶面积、净光合速率、净光合速率和光合利用效率差异显著(P<0.0 5),而叶片氮素a和叶绿素含量差异不显著。在次生演替过程中,比叶面积呈现高→低→高的变化规律,在早期群落中比叶面积最低。Nm和Chl在次生演替过程中呈双峰曲线,在灌木群落中达到峰值。在所有物种中,光合氮利用效率与SLA呈正相关,与Na呈负相关。所有树种的比叶面积与净光合速率(Na)呈负相关,与净光合速率(Nm)呈弱正相关。这些与资源捕获、利用和生长相关的特征可能阐明了黄土高原次生演替的机制。
The study investigated the specific leaf area (SLA), leaf photosynthetic rates (Pn), leaf nitrogen contents (on mass and area bases, Nm and Na, respectively) and nitrogen use efficiencies (PNUE) of 18 dominant species of four secondary succession groups in the Loess Plateau. The leaf SLA, N m, P n and PNUE significantly differed among the different secondary succession groups ( P<0.05), but the leaf N a and leaf chlorophyll content (Chl) did not differ. SLA varied in a high → low → high pattern with the secondary succession, reaching the lowest point in the early forest community. The N m and Chl showed a double peak curve with the secondary succession and peaked in the shrub community. Of all the species, the photosynthetic nitrogen use efficiencies were positively correlated with the SLA, but negatively correlated with the N a. The SLA of all the species negatively correlated with the N a, but weak positively correlated with the Nm. The above resource capture-, use- and growth-related traits probably clarified the mechanism of the secondary succession in the Loess Plateau.
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