Increased precipitation, rather than warming, exerts a strong influence on arbuscular mycorrhizal fungal community in a semiarid steppe ecosystem
Increased precipitation, rather than warming, exerts a strong influence on arbuscular mycorrhizal fungal community in a semiarid steppe ecosystem
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降水增加而不是变暖对半干旱草原生态系统中的丛枝菌根真菌群落产生强烈影响
DOI：
10.1139/cjb-2015-0210
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发表时间：
2016-06-01
期刊：
影响因子：
1.1
通讯作者：
Guo, Liang-Dong
中科院分区：
文献类型：
--
作者：
Gao, Cheng;Kim, Yong-Chan;Guo, Liang-Dong
了解丛枝菌根（AM）真菌对变暖和降水增加的反应对于了解生物多样性如何维持以及自然生态系统在全球气候变化情景下如何发挥功能至关重要。本研究在中国北方半干旱草原进行了为期6年的气候变暖和降水量增加的试验，对AM真菌群落进行了研究。与对照处理相比，仅降水量增加，无论升温与否，AM真菌胞外菌丝密度均显著增加。AM真菌孢子密度显着增加变暖和降水量增加的组合，增加降水量只处理，但不是单独变暖。通过18 SrDNA的454焦磷酸测序，共获得36个AM真菌操作分类单位（OTU）。与对照处理相比，仅增加降水量，无论变暖与否，AM真菌OTU丰富度和Shannon多样性指数均显著降低，但AM真菌Bray-Curtis相异指数显著升高。AM真菌群落组成的显着影响降水量增加，通过水的可用性，但不是由变暖。我们的研究结果表明，AM真菌群落响应更强烈的水的可用性比半干旱草原生态系统变暖。
Knowing the responses of arbuscular mycorrhizal (AM) fungi to warming and increased precipitation are critical for understanding how biodiversity is maintained and how the ecosystem functions under global climate-change scenarios in natural ecosystems. In this study, AM fungal communities were examined in a 6 year experiment with warming and increased precipitation, in a semiarid steppe in northern China. Only the increased precipitation, regardless of warming, significantly increased AM fungal extra-radical hyphal density, compared with the control treatment. AM fungal spore density was significantly increased by the combination of warming and increased precipitation, and increased precipitation-only treatments, but not by warming alone. A total of 36 operational taxonomic units (OTUs) of AM fungi were recovered by 454 pyrosequencing of 18S rDNA. Only increased precipitation, regardless of warming, significantly decreased AM fungal OTU richness and Shannon diversity index, and yet significantly increased AM fungal Bray-Curtis dissimilarity index, compared with the control treatment. AM fungal community composition was significantly affected by increased precipitation via water availability, but not by warming. Our findings demonstrated that the AM fungal community responded more strongly to water availability than to warming in the semiarid steppe ecosystem.