Growth explains microbial carbon use efficiency across soils differing in land use and geology

土壤水分 水分 生物量(生态学) 含水量 化学 孵化 呼吸 环境科学 土壤碳 农学 环境化学 总有机碳 土壤呼吸 耕地 土壤科学 生态学 植物 生物 地质学 农业 有机化学 生物化学 岩土工程
作者
Qing Zheng,Yuntao Hu,Shasha Zhang,Lisa Noll,Theresa Böckle,Andreas Richter,Wolfgang Wanek
出处
期刊:Soil Biology & Biochemistry [Elsevier]
卷期号:128: 45-55 被引量:158
标识
DOI:10.1016/j.soilbio.2018.10.006
摘要

The ratio of carbon (C) that is invested into microbial growth to organic C taken up is known as microbial carbon use efficiency (CUE), which is influenced by environmental factors such as soil temperature and soil moisture. How microbes will physiologically react to short-term environmental changes is not well understood, primarily due to methodological restrictions. Here we report on two independent laboratory experiments to explore short-term temperature and soil moisture effects on soil microbial physiology (i.e. respiration, growth, CUE, and microbial biomass turnover): (i) a temperature experiment with 1-day pre-incubation at 5, 15 and 25 °C at 60% water holding capacity (WHC), and (ii) a soil moisture/oxygen (O2) experiment with 7-day pre-incubation at 20 °C at 30%, 60% WHC (both at 21% O2) and 90% WHC at 1% O2. Experiments were conducted with soils from arable, pasture and forest sites derived from both silicate and limestone bedrocks. We found that microbial CUE responded heterogeneously though overall positively to short-term temperature changes, and decreased significantly under high moisture level (90% WHC)/suboxic conditions due to strong decreases in microbial growth. Microbial biomass turnover time decreased dramatically with increasing temperature, and increased significantly at high moisture level (90% WHC)/suboxic conditions. Our findings reveal that the responses of microbial CUE and microbial biomass turnover to short-term temperature and moisture/O2 changes depended mainly on microbial growth responses and less on respiration responses to the environmental cues, which were consistent across soils differing in land use and geology.
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