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

被引：170

作者：

Zheng, Qing ^{[1
]}

Hu, Yuntao ^{[1
]}

Zhang, Shasha ^{[1
]}

Noll, Lisa ^{[1
]}

Boeckle, Theresa ^{[1
]}

Richter, Andreas ^{[1
]}

Wanek, Wolfgang ^{[1
]}

机构：

[1] Univ Vienna, Dept Microbiol & Ecosyst Sci, Res Network Chem Meets Microbiol, Atthanstr 14, A-1090 Vienna, Austria

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2019年 / 128卷

基金：

奥地利科学基金会;

关键词：

Carbon use efficiency; Microbial biomass turnover time; Temperature; Moisture; Short-term environmental effects; BACTERIAL-GROWTH; TEMPERATURE SENSITIVITY; METABOLIC QUOTIENT; ORGANIC-MATTER; BIOMASS CARBON; IN-SITU; RESPIRATION; COMMUNITIES; MINERALIZATION; ADAPTATION;

D O I：

10.1016/j.soilbio.2018.10.006

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

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 degrees C at 60% water holding capacity (WHC), and (ii) a soil moisture/oxygen (O-2) experiment with 7-day pre-incubation at 20 degrees C at 30%, 60% WHC (both at 21% O-2) and 90% WHC at 1% O-2. 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/O-2 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.

引用

页码：45 / 55

页数：11

共 77 条

[11]

Boyd C.E., 1995, BOTTOM SOILS SEDIMEN, P194, DOI [10.1007/978-1-4615-1785-6_6, DOI 10.1007/978-1-4615-1785-6_6]

[12] Thermal adaptation of soil microbial respiration to elevated temperature [J].