globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2020.103501
论文题名:
Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems
作者: Deng L.; Peng C.; Kim D.-G.; Li J.; Liu Y.; Hai X.; Liu Q.; Huang C.; Shangguan Z.; Kuzyakov Y.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 214
语种: 英语
中文关键词: mineral N ; N mineralization ; nitrification ; plant C input ; precipitation reduction ; soil CO2 emission ; soil microorganisms ; soil organic C
英文关键词: climate effect ; drought ; global change ; mineralization ; nitrification ; plant community ; precipitation (chemistry) ; soil carbon ; soil nitrogen
英文摘要: Extreme droughts have serious impacts on the pools, fluxes and processes of terrestrial carbon (C) and nitrogen (N) cycles. A deep understanding is necessary to explore the impacts of this extreme climate change events. To investigate how soil C and N pools and fluxes respond to drought and explore their mechanisms we conducted a meta-analysis synthesizing the responses of soil C and N cycles to droughts (precipitation reduction experiments) in three main natural ecosystems: forests, shrubs and grasslands. Data were collected from 148 recent publications (1815 sampling data at 134 sites) with the drought experiments from 1 to 13 years across the globe. Drought reduced soil organic C content (-3.3%) mainly because of decreased plant litter input (-8.7%) and reduced litter decomposition (-13.0%) across all the three ecosystem types in the world. Drought increased mineral N content (+31%) but reduced N mineralization rate (-5.7%) and nitrification rate (-13.8%), and thus left total N unchanged. Compared with the local precipitation, drought increased the accumulation of dissolved organic C and N contents by +59% and +33%, respectively, due to retarded mineralization and higher stability of dissolved organic matter. Among the three ecosystem types, forest soils strongly increased litter C (+64%, n=8) and N content (+33%, n=6) as well as microbial CO2 (+16%, n=55), whereas total CO2 emission remains unaffected. Drought decreased soil CO2 emission (-15%, n=53) in shrubs due to reduction of microbial respiration and decreased root biomass. The 98% (n=39) increase of NH4+ concentration in forest soils corresponds to 11% (n=37) decrease of NO3- and so, it reflected the increase of N mineralization rate, but the decrease of nitrification. For shrubs and grasslands, however, stabilized or decreased N mineralization and nitrification mean less N uptake by plants under drought. Overall, the effects of drought on soil C and N cycles were regulated by the ecosystem type, drought duration and intensity. The drought intensity and duration intensify all effects, especially on the decreasing total CO2 emission. However, the most studies mainly focused on the short-term droughts, and there is a lack of comprehensive understanding of how drought effects in a long-term consequences. So, future studies should strengthen drought frequency impacts on ecosystem C and N dynamics in the long-term sequence (> 10 years) in order to face the impacts of global change. © 2020 Elsevier B.V.
Citation statistics:
被引频次[WOS]:147   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166376
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; Center of CEF/ESCER, Department of Biological Science, University of Quebec at Montreal, Montreal, H3C 3P8, Canada; Wondo Genet College of Forestry and Natural Resources, Hawassa University, PO Box 128, Shashemene, Ethiopia; School of Geography and Information Engineering, China University of Geosciences, Wuhan, China; Department of Agricultural Soil Science, Department of Soil Science of Temperate Ecosystems, Georg-August-University, Göttingen, Germany; Institute of Environmental Sciences, Kazan Federal University, Kazan, Agro-Technological Institute, RUDN University, Moscow, 117198, Russian Federation

Recommended Citation:
Deng L.,Peng C.,Kim D.-G.,et al. Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems[J]. Earth Science Reviews,2021-01-01,214
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Deng L.]'s Articles
[Peng C.]'s Articles
[Kim D.-G.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Deng L.]'s Articles
[Peng C.]'s Articles
[Kim D.-G.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Deng L.]‘s Articles
[Peng C.]‘s Articles
[Kim D.-G.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.