Semiarid ecosystems are susceptible to changes in precipitation regimes. However, how soil micro-eukaryote communities in semi-arid ecosystems respond to variations in the seasonal distribution of precipitation remains elusive. A 5-year field experiment was performed to investigate the effect of changed precipitation distributions throughout the growing season on soil micro-eukaryotic communities in the temperate steppe. Early-season precipitation did not significantly affect the biomass of arbuscular mycorrhizal fungi (AMF) nor the composition and structure of AMF and protist communities. Late-season precipitation significantly increased the biomass of AMF while significantly altering the relative abundance of dominant genera in AMF and protist communities. There was a clear difference in the community structure of AMF and protists between the late-season precipitation and natural precipitation. In addition, late-season precipitation decreased the amount of consumer protists but enhanced the abundance of parasitic protists. These results indicate that the impact of precipitation limitations in the middle growing season can be weakened by increased precipitation in the early growing seasons, while an increase in precipitation later in the growing season does not improve the impact of a decrease in precipitation in the middle growing season. Our findings highlight the potential impact of intra-annual changes in precipitation in soil micro-eukaryotic communities in arid and semiarid regions.

中文翻译：

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半干旱草原土壤微真核生物群落对早季和晚季降水的不同响应模式

半干旱生态系统容易受到降水状况变化的影响。然而，半干旱生态系统中的土壤微真核生物群落如何响应降水季节分布的变化仍然难以捉摸。进行了为期 5 年的田间试验，研究整个生长季节降水分布的变化对温带草原土壤微真核生物群落的影响。早季降水没有显着影响丛枝菌根真菌（AMF）的生物量，也没有显着影响AMF和原生生物群落的组成和结构。季末降水显着增加了 AMF 的生物量，同时显着改变了 AMF 和原生生物群落中优势属的相对丰度。晚季降水与自然降水的AMF和原生生物群落结构存在明显差异。此外，季末降水减少了消费原生生物的数量，但增加了寄生原生生物的丰度。这些结果表明，生长季中期降水限制的影响可以通过生长季早期降水的增加而减弱，而生长季后期降水的增加并不能改善生长季中期降水减少的影响。季节。我们的研究结果强调了干旱和半干旱地区土壤微真核生物群落降水量的年内变化的潜在影响。