Effects of vegetation coverage and seasonal change on soil microbial biomass and community structure in the dry-hot valley region Effects of vegetation coverage and seasonal change on soil microbial biomass and community structure in the dry-hot valley region

最小化 最大化

Vol15 No.7: 1546-1558

Title】Effects of vegetation coverage and seasonal change on soil microbial biomass and community structure in the dry-hot valley region

Author】WU Han1,2; XIONG Dong-hong1*; XIAO Liang1,2; ZHANG Su1,2; YUAN Yong1,2; SU Zheng-an1; ZHANG Bao-jun1,2; YANG Dan1,2

Addresses】1 Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author】XIONG Dong-hong

Citation】Wu H, Xiong DH, Xiao L, et al. (2018) Effects of vegetation coverage and seasonal change on soil microbial biomass and community structure in the dry-hot valley region. Journal of Mountain Science 15(7). https://doi.org/10.1007/s11629-017-4650-2

DOI】https://doi.org/10.1007/s11629-017-4650-2

Abstract】Soil microorganisms are sensitive indicator of soil health and quality. Understanding the effects of vegetation biomass and seasonal change on soil microorganisms is vital to evaluate the soil quality and implement vegetation restoration. This study analyzed the soil phospholipid fatty acids (PLFAs) in fresh and withered Kudzu (Pueraria montana var.lobata) vegetation conditions in different seasons. The results showed that vegetation biomass and seasonal change significantly affected microbial biomass and its community structure. Both fresh and withered Kudzu cover significantly increased soil microbial biomass, and the growth effect of microbes in the soil with fresh Kudzu cover was more obvious than that with withered Kudzu cover. Compared with the dry season, the rainy season significantly increased the microbial biomass and the B/F (the ratio of bacterial to fungal PLFAs) ratio but dramatically reduced the G+/G- (the ratio of gram-positive to gram-negative bacteria PLFAs). Kudzu cover and seasonal change had a significant effect on microbial structure in soil covered by higher vegetation biomass. Furthermore, soil temperature and moisture had different correlations with specific microbial biomass in the two seasons. Our findings highlight the effect of Kudzu vine cover on the soil microenvironment and soil microhabitat, enhancing the soil quality in the Dry-hot Valley of Jinsha River, Southwest China.

Keywords】Phospholipid fatty acid; Vegetation; Soil microbes; Soil temperature; Soil moisture; Dry-hot valley