Soil biota reduce allelopathic effects of the invasive Eupatorium adenophorum.
Soil biota reduce allelopathic effects of the invasive Eupatorium adenophorum.
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DOI：
10.1371/journal.pone.0025393
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Ma K
中科院分区：
文献类型：
--
作者：
Zhu X;Zhang J;Ma K
化感作用被认为在外来植物入侵中发挥作用，对这一过程的研究可以提高我们对植物相互作用如何直接和间接影响植物群落组织和生态系统功能的理解。然而，化感作用可以是高度条件性的。例如，在体内证明的化感作用可能难以在田间土壤中证明。本文研究了紫茎泽兰（Eupatorium adenophorum，croftonweed）对我国乡土植物芜菁（Brassica rapa）的植物毒性。我们的研究结果表明，从不同的入侵生境的天然土壤减轻或消除相对于沙文化的潜在化感物质的功效。当土壤被消毒后，化感作用又恢复了;这表明土壤生物区系是天然土壤中植物毒性降低的原因。E.紫茎泽兰可以在被入侵者侵染的天然土壤中发现，当这些化合物作为沥滤液加入土壤中时，它们在天然土壤中24小时后显示出大量降解，但在沙子中没有。我们的研究结果强调，土壤生物群可以减少入侵者对其他植物的化感作用，因此可以减少群落的入侵性。这些结果也表明，土壤生物区系可能有更强或更弱的影响，取决于如何传递化感物质的相互作用。
Allelopathy has been hypothesized to play a role in exotic plant invasions, and study of this process can improve our understanding of how direct and indirect plant interactions influence plant community organization and ecosystem functioning. However, allelopathic effects can be highly conditional. For example allelopathic effects demonstrated in vivo can be difficult to demonstrate in field soils. Here we tested phytotoxicity of Eupatorium adenophorum (croftonweed), one of the most destructive exotic species in China, to a native plant species Brassica rapa both in sand and in native soil. Our results suggested that natural soils from different invaded habitats alleviated or eliminated the efficacy of potential allelochemicals relative to sand cultures. When that soil is sterilized, the allelopathic effects returned; suggesting that soil biota were responsible for the reduced phytotoxicity in natural soils. Neither of the two allelopathic compounds (9-Oxo-10,11-dehydroageraphorone and 9b-Hydroxyageraphorone) of E. adenophorum could be found in natural soils infested by the invader, and when those compounds were added to the soils as leachates, they showed substantial degradation after 24 hours in natural soils but not in sand. Our findings emphasize that soil biota can reduce the allelopathic effects of invaders on other plants, and therefore can reduce community invasibility. These results also suggest that soil biota may have stronger or weaker effects on allelopathic interactions depending on how allelochemicals are delivered.
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