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Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth

文献类型：期刊论文

作者Zhu, Erxiong5; Cao, Zhenjiao5; Jia, Juan; Liu, Chengzhu5; Zhang, Zhenhua1; Wang, Hao; Dai, Guohua; He, Jin-Sheng; Feng, Xiaojuan5
刊名GLOBAL CHANGE BIOLOGY
出版日期2021
卷号27期号:10页码:2241-2253
关键词carbon utilization efficiency climate change deep soil microbial necromass mineralization potential nitrogen limitation soil organic carbon
ISSN号1354-1013
DOI10.1111/gcb.15541
文献子类Article
英文摘要Subsoils contain >50% of soil organic carbon (SOC) globally yet remain under-investigated in terms of their response to climate changes. Recent evidence suggests that warmer, drier conditions in alpine grasslands induce divergent responses in SOC decomposition and carbon accrual in top- versus subsoils. However, longer term effects on microbial activity (i.e., catabolic respiration vs. anabolic growth) and belowground carbon cycling are not well understood. Here we utilized a field manipulation experiment on the Qinghai-Tibetan Plateau and conducted a 110-day soil incubation with and without C-13-labeled grass litter to assess microbes' role as both SOC decomposers and contributors in the top- (0-10 cm) versus subsoils (30-40 cm) after 5 years of warming and drought treatments. Microbial mineralization of both SOC and added litter was examined in tandem with potential extracellular enzyme activities, while microbial biomass synthesis and necromass accumulation were analyzed using phospholipid fatty acids and amino sugars coupled with C-13 analysis, respectively. We found that warming and, to a lesser extent, drought decreased the ratio of inorganic nitrogen (N) to water-extractable organic carbon in the subsoil, intensifying N limitation at depth. Both SOC and litter mineralization were reduced in the subsoil, which may also be related to N limitation, as evidenced by lower hydrolase activity (especially leucine aminopeptidase) and reduced microbial efficiency (lower biomass synthesis and necromass accumulation relative to respiration). However, none of these effects were observed in the topsoil, suggesting that soil microbes became inactive and inefficient in subsoil but not topsoil environments. Given increasing belowground productivity in this alpine grassland under warming, both elevated root deposits and diminished microbial activity may contribute to new carbon accrual in the subsoil. However, the sustainability of plant growth and persistence of subsoil SOC pools deserve further investigation in the long term, given the aggravated N limitation at depth.
学科主题Biodiversity Conservation ; Ecology ; Environmental Sciences
出版地HOBOKEN
电子版国际标准刊号1365-2486
WOS关键词SOIL ORGANIC-MATTER ; EXTRACELLULAR ENZYME-ACTIVITIES ; COMMUNITY STRUCTURE ; USE EFFICIENCY ; CLIMATE-CHANGE ; MURAMIC ACID ; AMINO-SUGARS ; PLANT INPUTS ; TEMPERATURE ; NITROGEN
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
语种英语
WOS记录号WOS:000617059000001
出版者WILEY
资助机构National Key R&D Program of China [2019YFA0607303] ; National Natural Science Foundation of China [31988102, 42025303, 31971502] ; Chinese Academy of Sciences K.C.Wong Education Foundation [GJTD-2019-10]
源URL[http://ir.ibcas.ac.cn/handle/2S10CLM1/26398]  
专题植被与环境变化国家重点实验室
作者单位1.Univ Chinese Acad Sci, Beijing, Peoples R China
2.Peking Univ, Coll Urban & Environm Sci, Inst Ecol, Beijing, Peoples R China
3.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China
4.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Peoples R China
5.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式
GB/T 7714		 Zhu, Erxiong,Cao, Zhenjiao,Jia, Juan,et al. Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth[J]. GLOBAL CHANGE BIOLOGY,2021,27(10):2241-2253.
APA Zhu, Erxiong.,Cao, Zhenjiao.,Jia, Juan.,Liu, Chengzhu.,Zhang, Zhenhua.,...&Feng, Xiaojuan.(2021).Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth.GLOBAL CHANGE BIOLOGY,27(10),2241-2253.
MLA Zhu, Erxiong,et al."Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth".GLOBAL CHANGE BIOLOGY 27.10(2021):2241-2253.

入库方式： OAI收割

来源：植物研究所

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