Analysis of spatiotemporal variations in the characteristics of soil microbial communities in Castanopsis fargesii fores
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ORIGINAL PAPER
Analysis of spatiotemporal variations in the characteristics of soil microbial communities in Castanopsis fargesii forests Hongyong Qiao1 • Yaning Luan1 • Bing Wang2 • Wei Dai1 • Mengsai Zhao1
Received: 25 June 2018 / Accepted: 1 October 2018 The Author(s) 2019
Abstract Castanopsis fargesii is a good afforestation plants and various microorganisms play important roles in mediating the growth and ecological functions of this species. In this study, we evaluated changes in microbial communities in soil samples from C. fargesii forests. The phospholipid fatty acid (PLFA) biomarker method was used to obtain bacteria, fungi, actinomycetes, gram-positive bacteria (G?), gram-negative bacteria (G-), aerobic bacteria, and anaerobic bacteria to investigate spatiotemporal changes in microbial communities during the growing season. The results show that soil microorganisms were mainly concentrated in the upper 20-cm layer, demonstrating an obvious surface aggregation (P \ 0.05). Large amounts of litter and heavy rainfall during the early growing season resulted in the highest PLFA contents for various microorganisms, whereas relatively low and stable levels were observed during other times. The dominant species during each period were bacteria. G? or aerobic bacteria were the main bacterial populations, Project funding: This study was supported by the Science and Technology Basic Work Special (No 2014FY120700). The online version is available at http://www.springerlink.com Corresponding editor: Chai Ruihai. & Wei Dai [email protected] 1
College of Forestry, Beijing Forestry University, Qinghua East Road No. 35, Haidian District, Beijing 100083, People’s Republic of China
2
Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing Summer Palace and the red flag, Haidian District, Beijing 100091, People’s Republic of China
providing insights into the overall trends of soil bacterial PLFA contents. Due to the relative accumulation of refractory substances during the later stages of litter decomposition, the effects of fungi increased significantly. Overall, our findings demonstrate that the main factors influencing microbial communities were litter, rainfall, and soil field capacity. Keywords Castanopsis fargesii Phospholipid fatty acids Soil microbial community Spatiotemporal variations
Introduction Soil microorganisms are important components and active participants in material circulation, energy flow, and information transmission in forest ecosystems (Zhang et al. 2017). Because of the sensitivity of these organisms to the living microenvironment, microbial community structure can be used as a sensitive index to evaluate changes in soil ecosystems. Studying the community structure and diversity of soil microbes can provide important insights into the stability of soil ecosystems, the buffering capacity of the soil against ecological deterioration, and soil quality (McGuire et al. 2010; Bardgett and van der Putten 2014; Huang et al. 2015). Additional
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