Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems

doi:10.1016/j.earscirev.2020.103501

	Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems
	Deng, Lei 2,3; Peng, Changhui 4; Kim, Dong-Gill 5; Li, Jiwei 3; Liu, Yulin 3; Hai, Xuying 2; Liu, Qiuyu 4; Huang, Chunbo 6; Shangguan, Zhouping 2,3; Kuzyakov, Yakov 1,7,8
刊名	EARTH-SCIENCE REVIEWS
	2021-03-01
卷号	214 页码:15
关键词	mineral N N mineralization nitrification precipitation reduction plant C input soil microorganisms soil organic C soil CO2 emission
ISSN号	0012-8252
DOI	10.1016/j.earscirev.2020.103501
通讯作者	Shangguan, Zhouping(shangguan@ms.iswc.ac.cn)
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.
资助项目	National Natural Science Foundation of China[41730638] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0603] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23070201] ; National Key Research and Development Program of China[2016YFC0501605] ; Funding of Special Support Plan of Young Talents Project of Shaanxi Province ; National Forestry and Grassland Administration in China[20201326015] ; Government Program of Competitive Growth of Kazan Federal University ; RUDN University program 5-100
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000631724300001
资助机构	National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China ; Funding of Special Support Plan of Young Talents Project of Shaanxi Province ; National Forestry and Grassland Administration in China ; Government Program of Competitive Growth of Kazan Federal University ; RUDN University program 5-100
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/160455]
专题	中国科学院地理科学与资源研究所
通讯作者	Shangguan, Zhouping
作者单位	1.Georg August Univ, Dept Agr Soil Sci, Dept Soil Sci Temperate Ecosyst, Gottingen, Germany 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.Univ Quebec Montreal, Dept Biol Sci, Ctr CEF ESCER, Montreal, PQ H3C 3P8, Canada 5.Hawassa Univ, Wondo Genet Coll Forestry & Nat Resources, POB 128, Shashemene, Ethiopia 6.China Univ Geosci, Sch Geog & Informat Engn, Wuhan, Peoples R China 7.Kazan Fed Univ, Inst Environm Sci, Kazan, Russia 8.RUDN Univ, Agrotechnol Inst, Moscow 117198, Russia
推荐引用方式 GB/T 7714	Deng, Lei,Peng, Changhui,Kim, Dong-Gill,et al. Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems[J]. EARTH-SCIENCE REVIEWS,2021,214:15.
APA	Deng, Lei.,Peng, Changhui.,Kim, Dong-Gill.,Li, Jiwei.,Liu, Yulin.,...&Kuzyakov, Yakov.(2021).Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems.EARTH-SCIENCE REVIEWS,214,15.
MLA	Deng, Lei,et al."Drought effects on soil carbon and nitrogen dynamics in global natural ecosystems".EARTH-SCIENCE REVIEWS 214(2021):15.