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首页> 美国卫生研究院文献>PLoS Clinical Trials >Effects of single and repeated drought on soil microarthropods in a semi-arid ecosystem depend more on timing and duration than drought severity
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Effects of single and repeated drought on soil microarthropods in a semi-arid ecosystem depend more on timing and duration than drought severity

机译：一次和多次干旱对半干旱生态系统中土壤微节肢动物的影响更多地取决于时间和持续时间，而不是干旱严重程度

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Soil moisture is one of the most important factors affecting soil biota. In arid and semi-arid ecosystems, soil mesofauna is adapted to temporary drought events, but, until now, we have had a limited understanding of the impacts of the different magnitudes and frequencies of drought predicted to occur according to future climate change scenarios. The present study focuses on how springtails and mites respond to simulated repeated drought events of different magnitudes in a field experiment in a Hungarian semi-arid sand steppe. Changes in soil arthropod activities were monitored with soil trapping over two years in a sandy soil. In the first year (2014), we applied an extreme drought pretreatment, and in the consecutive year, we applied less devastating treatments (severe drought, moderate drought, water addition) to these sites. In the first year, the extreme drought pretreatment tended to have a negative effect (either significantly or not significantly) on the capture of all Collembola groups, whereas all mite groups increased in activity density. However, in the consecutive year, between the extreme drought and control treatments, we only detected differences in soil microbial biomass. In the cases of severe drought, moderate drought and water addition, we did not find considerable changes across the microarthropods, except in the case of epedaphic Collembola. In the cases of the water addition and drought treatments, the duration and timing of the manipulation seemed to be more important for soil mesofauna than their severity (i.e., the level of soil moisture decrease). We suggest that in these extreme habitats, soil mesofauna are able to survive extreme conditions, and their populations recover rapidly, but they may not be able to cope with very long drought periods.
机译：土壤水分是影响土壤生物的最重要因素之一。在干旱和半干旱的生态系统中，土壤中动物适合于暂时的干旱事件，但是直到现在，我们对根据未来气候变化情景预测的干旱的不同程度和频率所造成的影响的了解仍然有限。本研究的重点是在匈牙利半干旱沙质草原的田间试验中，松尾虫和螨虫如何响应不同强度的模拟重复干旱事件。土壤节肢动物活动的变化通过在沙质土壤中诱捕两年来进行监测。在第一年（2014年），我们对这些地点进行了极端干旱预处理，随后的一年，我们对这些地点进行了破坏性较小的处理（严重干旱，中度干旱，加水）。在第一年，极端干旱预处理倾向于对所有Collembola组的捕获产生负面影响（显着或不显着），而所有螨虫组的活动密度均增加。但是，在连续的极端干旱和控制处理之间，我们仅发现了土壤微生物量的差异。在严重干旱，中度干旱和加水的情况下，我们没有发现跨节肢动物的显着变化，除非是食虫性Collembola。在加水和干旱处理的情况下，操纵的持续时间和时机似乎对土壤中生动物比其严重性（即土壤水分水平降低）更为重要。我们建议在这些极端栖息地中，土壤中动物能够生存在极端条件下，其种群迅速恢复，但它们可能无法应对很长的干旱时期。

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