Depth matters: effects of precipitation regime on soil microbial activity upon rewetting of a plant-soil system

生物地球化学循环 中观 微生物种群生物学 降水 生物 稳定同位素探测 土层 土壤水分 微生物 大块土 环境科学 农学 生态学 土壤微生物学 生态系统 植物 细菌 土壤有机质 气象学 物理 遗传学
作者
Ilonka Engelhardt,Amy Welty,Steven J. Blazewicz,David Bru,Nadine Rouard,Marie-Christine Breuil,Arthur Geßler,Lucía Galiano,José Carlos Miranda,Aymé Spor,Romain L. Barnard
出处
期刊:The ISME Journal [Springer Nature]
卷期号:12 (4): 1061-1071 被引量:107
标识
DOI:10.1038/s41396-018-0079-z
摘要

Abstract Changes in frequency and amplitude of rain events, that is, precipitation patterns, result in different water conditions with soil depth, and likely affect plant growth and shape plant and soil microbial activity. Here, we used 18O stable isotope probing (SIP) to investigate bacterial and fungal communities that actively grew or not upon rewetting, at three different depths in soil mesocosms previously subjected to frequent or infrequent watering for 12 weeks (equal total water input). Phylogenetic marker genes for bacteria and fungi were sequenced after rewetting, and plant-soil microbial coupling documented by plant 13C-CO2 labeling. Soil depth, rather than precipitation pattern, was most influential in shaping microbial response to rewetting, and had differential effects on active and inactive bacterial and fungal communities. After rewetting, active bacterial communities were less rich, more even and phylogenetically related than the inactive, and reactivated throughout the soil profile. Active fungal communities after rewetting were less abundant and rich than the inactive. The coupling between plants and soil microbes decreased under infrequent watering in the top soil layer. We suggest that differences in fungal and bacterial abundance and relative activity could result in large effects on subsequent soil biogeochemical cycling.
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