Short-term effects of labile organic C addition on soil microbial response to temperature in a temperate steppe

被引：18

作者：

Li, Chao ^{[1
]}

Xiao, Chunwang ^{[1
]}

Guenet, Bertrand ^{[2
]}

Li, Mingxu ^{[3
]}

Xu, Li ^{[3
]}

He, Nianpeng ^{[3
,4
]}

机构：

[1] Minzu Univ China, Coll Life & Environm Sci, Beijing, Peoples R China

[2] PSL Univ, Ecole Normale Super, LG ENS Lab Geol, IPSL,CNRS UMR 8538, F-75005 Paris, France

[3] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China

[4] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2022年 / 167卷

关键词：

Temperature; LOC addition; Microbial respiration; Temperature sensitivity; CARBON; DECOMPOSITION; SENSITIVITY; EFFICIENCY; STOICHIOMETRY; BIOMASS;

D O I：

10.1016/j.soilbio.2022.108589

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

It remains unclear how soil microbes respond to labile organic carbon (LOC) inputs and how temperature sensitivity (Q(10)) of soil organic matter (SOM) decomposition is affected by LOC inputs in a short-term. In this study, C-13-labeled glucose was added to a pristine grassland soil at four temperatures (10, 15, 20, and 25 ?), and the immediate utilization of LOC and native SOM by microbes was measured minutely in a short-term. We found that the LOC addition stimulated the native SOM decomposition, and elevated temperature enhanced the in-tensity of microbial response to LOC addition. The ratio between microbial respiration derived from LOC and native SOM increased with higher temperature, and more LOC for respiration. Additionally, LOC addition increased the Q(10) of SOM decomposition, and the Q(10) of LOC decomposition is higher than that of native SOM. Overall, these findings emphasize the important role of temperature and LOC inputs in soil C cycles.

引用

页数：4