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

doi:10.1111/gcb.15541

	Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth
	Zhu, Erxiong 1; Cao, Zhenjiao 1; Jia, Juan ; Liu, Chengzhu 1; Zhang, Zhenhua 2; Wang, Hao ; Dai, Guohua ; He, Jin-Sheng ; Feng, Xiaojuan1
	2021
发表期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
卷号	27 期号:10 页码:2241-2253
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.
关键词	carbon utilization efficiency climate change deep soil microbial necromass mineralization potential nitrogen limitation soil organic carbon
学科领域	Biodiversity Conservation ; Ecology ; Environmental Sciences
DOI	10.1111/gcb.15541
收录类别	SCI
语种	英语
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)
WOS记录号	WOS:000617059000001
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2486
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]
作者邮箱	xfeng@ibcas.ac.cn
引用统计	被引频次：45[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	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.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Peoples R China 4.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China 5.Peking Univ, Coll Urban & Environm Sci, Inst Ecol, Beijing, 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.

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