Past aridity's effect on carbon mineralization potentials in grassland soils | |
Cao, Zhenjiao2; Jia, Yufu; Cai, Yue2; Wang, Xin2; Hu, Huifeng; Zhang, Jinbo3; Jia, Juan; Feng, Xiaojuan2 | |
刊名 | BIOGEOSCIENCES |
2019 | |
卷号 | 16期号:18页码:3605-3619 |
ISSN号 | 1726-4170 |
DOI | 10.5194/bg-16-3605-2019 |
文献子类 | Article |
英文摘要 | 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. |
学科主题 | Ecology ; Geosciences, Multidisciplinary |
电子版国际标准刊号 | 1726-4189 |
出版地 | GOTTINGEN |
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 |
语种 | 英语 |
出版者 | COPERNICUS GESELLSCHAFT MBH |
WOS记录号 | WOS:000487996500002 |
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] |
内容类型 | 期刊论文 |
源URL | [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.Nanjing Normal Univ, Sch Geog, Nanjing 210023, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, 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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