Xu Hengkang, Liu Nan, Zhang Yingjun
College of Grassland Science and Technology, China Agricultural University, 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, China.
Key Laboratory of Grassland Management and Rational Utilization, Ministry of Agriculture and Rural Affairs, Beijing 100193, China.
J Fungi (Basel). 2022 Feb 26;8(3):234. doi: 10.3390/jof8030234.
Global climate change is altering the amounts of ice and snow in winter, and this could be a major driver of soil microbial processes. However, it is not known how bacterial and fungal communities will respond to changes in the snow cover. We conducted a snow manipulation experiment to study the effects of snow removal on the diversity and composition of soil bacterial and fungal communities. A snow manipulation experiment was carried out on the meadow steppe in Hulunbuir, Inner Mongolia, China, during the winter period October 2019-March 2020. Soil samples were collected from the topsoil (0-10 cm) in mid-March 2020 (spring snowmelt period). Snow removal significantly reduced soil moisture and soil ammonium concentration. Lower snow cover also significantly changed the fungal community structure and beta diversity. Snow removal did not affect the bacterial community, indicating that fungal communities are more sensitive to snow exclusion than bacterial communities. The relative importance analysis (using the Lindeman-Merenda-Gold method) showed that available nitrogen (AN), soil water content (SWC), total organic carbon (TOC), microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN) together explained 94.59% of the variation in soil fungal beta diversity, where AN was identified as the most important predictor. These finding provide insights into potential impacts of climate warming and associated reduced snow cover on soil microbial communities and processes.
全球气候变化正在改变冬季冰雪的数量，这可能是土壤微生物过程的一个主要驱动因素。然而，尚不清楚细菌和真菌群落将如何应对积雪的变化。我们进行了一项积雪操纵实验，以研究除雪对土壤细菌和真菌群落多样性及组成的影响。2019年10月至2020年3月冬季期间，在中国内蒙古呼伦贝尔的草甸草原上进行了一项积雪操纵实验。2020年3月中旬（春季融雪期）从表层土壤（0 - 10厘米）采集土壤样本。除雪显著降低了土壤湿度和土壤铵浓度。较低的积雪覆盖也显著改变了真菌群落结构和β多样性。除雪对细菌群落没有影响，这表明真菌群落比细菌群落对除雪更敏感。相对重要性分析（使用Lindeman-Merenda-Gold方法）表明，有效氮（AN）、土壤含水量（SWC）、总有机碳（TOC）、微生物生物量碳（MBC）和微生物生物量氮（MBN）共同解释了土壤真菌β多样性变化的94.59%，其中AN被确定为最重要的预测因子。这些发现为气候变暖及相关积雪减少对土壤微生物群落和过程的潜在影响提供了见解。
