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首页> 外文期刊>Plant and Soil >Positive effects of ectomycorrhizal colonization on growth of seedlings of a tropical tree across a range of forest floor light conditions.
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Positive effects of ectomycorrhizal colonization on growth of seedlings of a tropical tree across a range of forest floor light conditions.

机译：外生菌根定植对一系列森林地面光照条件下热带树木幼苗生长的积极影响。

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摘要

In a shadehouse experiment we tested the effects of light, nutrients and ectomycorrhizal fungi (EMF) on the growth of Vatica albiramis van Slooten (Dipterocarpaceae) seedlings. We hypothesised that it is more advantageous for plants to form connections with EMF and to trade carbon for nutrients with EMF under high light than low light. The relationship between seedling growth and the proportion of ectomycorrhizal root tips was expected as positive in high light and as negative in low light. Light conditions simulated the forest understory (low; 3% full sunlight), a small gap (medium; 11%) and a large gap (high; 33%) and a fully factorial combination of nutrients (F-/+) and ectomycorrhizal colonization (EMF-/+) treatments were applied within light conditions. The application of EMF and nutrients did significantly alter seedling growth across the range of forest floor light conditions, however the key hypothesis was rejected as seedling growth under low light was not affected by increased EMF colonization of root tips (light:EMF colonization chi 2=2.97, p=0.23). In addition, the lack of difference in morphotype abundance across light conditions indicated that light changes may not favour the association to specific EMF in seedlings of this particular dipterocarp species. Our results suggest that antagonistic (non-beneficial to the plant) effects due to ectomycorrhizal colonization under a light constrained environment may not affect seedling growth of Vatica albiramis
机译：在遮荫棚实验中，我们测试了光，养分和外生菌根真菌（EMF）对梵蒂冈（Dipterocarpaceae）幼苗生长的影响。我们假设植物在强光下比在弱光下与EMF形成连接并用EMF交换碳以获取营养物质更为有利。预计在高光下幼苗生长与外生菌根根尖比例之间的关系为正，在低光下为负。光照条件模拟了林下林（低; 3％的日光），小间隙（中等; 11％）和大间隙（高; 33％）以及养分的完全因子组合（F-/ +）和菌根菌落定植（EMF-/ +）处理在光照条件下进行。 EMF和养分的施用确实在整个森林地面光照条件下都显着改变了幼苗的生长，但是关键假说被拒绝了，因为弱光下的幼苗生长不受根尖EMF移生的影响（光照：EMF移生chi 2 = 2.97， p = 0.23）。另外，在光照条件下形态型丰度缺乏差异，这表明光照变化可能不利于该特定种果皮树种幼苗中与特定EMF的结合。我们的结果表明，在光照受限的环境下，由于外生菌根定植而产生的拮抗作用（对植物无益）可能不会影响 Vatica albiramis 的幼苗生长

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