Responses of soil biota and nitrogen availability to an invasive plant under aboveground herbivory
Responses of soil biota and nitrogen availability to an invasive plant under aboveground herbivory
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土壤生物群和氮素有效性对地上食草植物入侵植物的响应
DOI：
10.1007/s11104-017-3179-z
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发表时间：
2017-01
期刊：
影响因子：
4.9
通讯作者：
Wu JH
中科院分区：
文献类型：
--
作者：
Zhou JH;Ju RT;Li B;Wu JH
目的近年来，地上草本植物对土壤生态系统的植物介导效应受到了广泛关注。然而，关于入侵植物草食诱导对土壤生态系统影响的研究仍然缺乏。本研究旨在研究一种入侵植物在地上草食胁迫下的土壤生物区系和养分有效性，并将其与本土植物的土壤响应进行比较。方法对入侵植物互花米草（米草）和本土植物芦苇（芦苇）进行土蛾幼虫的取食，测定土壤微生物、线虫、无机氮(N)、植物生物量和N含量。结果入侵植物对土壤微生物量、线虫丰度、铵态氮浓度和氮矿化率均有显著影响。互。此外，s的菌真菌比刺激、菌性线虫丰度和铵态氮有效性显著高于s。alterniflorathan forP。南极光。结论一般情况下，地上昆虫的植食性较强。互花提高了土壤生物多样性，提高了土壤氮素有效性。与s有关的土壤反应更大。互花植物比原生植物具有更强的土壤正反馈。这可能有助于入侵植物在生物胁迫下成功入侵其新范围。
AimsRecently, much attention has been paid to the plant-mediated effects of aboveground herbivory on soil ecosystems. However, studies about the herbivore-induced effects of invasive plants on soil ecosystem are still lacking. In this study, we aimed to examine the soil biota and nutrient availability to an invasive plant under aboveground herbivory stress, and compare the soil responses with a native plant.MethodsWe subjected an invasive plant (Spartina alterniflora) and a native plant (Phragmites australis) to herbivory by caterpillars of native mothLaelia coenosa, and measured soil microbes, nematodes, inorganic nitrogen (N), plant biomass and N content.ResultsSoil microbial biomass, nematode abundance, ammonium N concentrations and N mineralization rates were significantly stimulated by herbivory of the invasiveS. alterniflora. Besides, the stimulation of bacteria: fungi ratio, abundance of bacterivorous nematodes, and ammonium N availability were significantly higher forS. alterniflorathan forP. australis.ConclusionsIn general, aboveground insect herbivory of the invasiveS. alternifloraenhanced the abundance of soil biota, and the soil N availability. The greater soil responses associated withS. alterniflorasuggest stronger positive soil feedback than those with the nativeP. australis, which might facilitate the invasive plant to successfully invade its new range under biotic stress.
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