Plant biodiversity in a larch plantation from the view point of photosynthetic nitrogen use efficiency in northeast China
Plant biodiversity in a larch plantation from the view point of photosynthetic nitrogen use efficiency in northeast China
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DOI：
10.1007/s11355-009-0066-7
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发表时间：
2009-06
影响因子：
2
通讯作者：
Wenjie Wang;Huimei Wang;Y. Zu
中科院分区：
文献类型：
--
作者：
Wenjie Wang;Huimei Wang;Y. Zu
落叶松林下林冠结构相对稀疏，常为林下多种植物提供生长生境。丰富的林下植物群对落叶松林分的肥力具有重要作用。通过对东北落叶松种植园72种多年生落叶植物的光合作用研究，发现高位芽植物（Ph）与地上芽植物（Ch）、地面芽植物（He）和隐芽植物（Cr）3种生活型之间存在显著的光合作用差异，Ch、He和Cr之间的差异较小。Ph种的PNUE和氮素对叶绿素（Chl./与其他3种生活型相比，Ph中的氮素分配（Vcmax/N）和羧化过程中的氮素分配（Vcmax/N）均显著增加。Ph处理的单位投影面积氮素（Narea）和比叶面积氮素（SLA，cm ~ 2g ~（-1））显著低于对照。在低SLA时，Ph物种的PNUE随SLA的变化较小，但在高SLA时，Ch、He和Cr物种的PNUE随SLA的变化很大。研究结果表明，叶片形态变化对于阐明不同生活型植物光合作用的差异具有重要意义。
Forest floor of larch species often provides growth habitat for many kinds of understory species because of relatively sparse structure in a larch canopy. A rich flora of forest understory species may play an essential role in maintaining fertility of a larch stand. An attempt was made to evaluate photosynthetic nitrogen use efficiency (PNUE) of many understory and overstory species according to their Raunkiaer lifeform. By studying 72 perennial deciduous species in a larch plantation in northeast China, marked photosynthetic differences between phanerophytes (Ph) and other three lifeforms of chamaephytes (Ch), hemicryptophytes (He), and cryptophytes (Cr) were found, with marginal differences found among Ch, He, and Cr. Ph species had much lower PNUE, and much lower values of rate of nitrogen allocation to chlorophyll (Chl./N) and nitrogen allocation to carboxylation processes (Vcmax/N) were concurrently observed in Ph compared with the other three lifeforms. Ph had much lower leaf nitrogen per unit of projection area (Narea) and specific leaf area (SLA, cm2g–1). At lower SLA, for Ph species the change of PNUE with SLA was small, but these changes became very large at higher SLA for Ch, He, and Cr species. Our findings indicate that leaf morphological change is important for clarifying photosynthesis differences among species with different lifeform.