Past aridity's effect on carbon mineralization potentials in grassland soils

doi:10.5194/bg-16-3605-2019

	Past aridity's effect on carbon mineralization potentials in grassland soils
	Cao, Zhenjiao 1; Jia, Yufu ; Cai, Yue 1; Wang, Xin 1; Hu, Huifeng ; Zhang, Jinbo 2; Jia, Juan ; Feng, Xiaojuan1
	2019
发表期刊	BIOGEOSCIENCES
ISSN	1726-4170
卷号	16 期号:18 页码:3605-3619
摘要	Mineralization potential is a key property for assessing carbon substrate's degradability and mineralization in biogeochemical models and studies. While mineralization potential is widely examined under controlled conditions, whether and how it is influenced by the past aridity of sample's origins remain poorly constrained, which is important for an accurate assessment and prediction of future CO2 emissions. Here we collect topsoils and subsoils from different aridity regimes along a 2100 km grassland transect of northern China and conduct a 91 d decomposition experiment with and without the addition of C-13-labeled leaf litter under controlled temperature and moisture. CO2 release from both soil organic carbon (SOC) and fresh litter is measured, along with microbial biomass, extracellular enzyme activities, and soil and mineral properties. We find that neither microbial carbon use efficiency nor biomass-normalized metabolic quotient (qCO(2)) is related to the aridity of sampling sites. However, both fresh litter and SOC display the highest mineralization potentials in soils originating from the driest site. Using pathway analysis, we demonstrate that past aridity's effect is mediated by differential mechanisms for substrates of varied complexity. While microbial biomass plays a more important role in the decomposition of fresh litter, enzyme-catalyzed extracellular reactions predominantly govern the mineralization of SOC. Our findings provide novel evidence on the mechanisms underlying past aridity's effect on the mineralization potentials of organic matter with different qualities, which has significant implications for assessing and modeling decomposition in different aridity regimes.
学科领域	Ecology ; Geosciences, Multidisciplinary
DOI	10.5194/bg-16-3605-2019
收录类别	SCI
语种	英语
WOS关键词	MICROBIAL COMMUNITY STRUCTURE ; DISSOLVED ORGANIC-MATTER ; ROOT DECOMPOSITION ; OXIDATIVE-ENZYMES ; STABILIZATION ; MECHANISMS ; CLIMATE ; TEMPERATURE ; DYNAMICS ; QUALITY
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS记录号	WOS:000487996500002
出版者	COPERNICUS GESELLSCHAFT MBH
文献子类	Article
出版地	GOTTINGEN
EISSN	1726-4189
资助机构	Chinese National Key Development Program for Basic Research [2017YFC0503902, 2015CB954201] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41422304, 41773067, 41807329] ; International Partnership Program of Chinese Academy of Sciences [151111KYSB20160014]
作者邮箱	xfeng@ibcas.ac.cn
作品OA属性	gold, Green Submitted
引用统计	被引频次：7[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/2S10CLM1/19570
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, Coll Resources & Environm, Beijing 100049, Peoples R China 3.Nanjing Normal Univ, Sch Geog, Nanjing 210023, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Cao, Zhenjiao,Jia, Yufu,Cai, Yue,et al. Past aridity's effect on carbon mineralization potentials in grassland soils[J]. BIOGEOSCIENCES,2019,16(18):3605-3619.
APA	Cao, Zhenjiao.,Jia, Yufu.,Cai, Yue.,Wang, Xin.,Hu, Huifeng.,...&Feng, Xiaojuan.(2019).Past aridity's effect on carbon mineralization potentials in grassland soils.BIOGEOSCIENCES,16(18),3605-3619.
MLA	Cao, Zhenjiao,et al."Past aridity's effect on carbon mineralization potentials in grassland soils".BIOGEOSCIENCES 16.18(2019):3605-3619.

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