气候变化领域集成服务门户(CCPortal): Do alternative irrigation strategies for rice cultivation decrease water footprints at the cost of long-term soil health?

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DOI	10.1088/1748-9326/ab2108
	Do alternative irrigation strategies for rice cultivation decrease water footprints at the cost of long-term soil health?
	Livsey J.; Kätterer T.; Vico G.; Lyon S.W.; Lindborg R.; Scaini A.; Da C.T.; Manzoni S.
发表日期	2019
ISSN	17489318
卷号	14 期号:7
英文摘要	The availability of water is a growing concern for flooded rice production. As such, several water-saving irrigation practices have been developed to reduce water requirements. Alternate wetting and drying and mid-season drainage have been shown to potentially reduce water requirements while maintaining rice yields when compared to continuous flooding. With the removal of permanently anaerobic conditions during the growing season, water-saving irrigation can also reduce CO2 equivalent (CO2eq) emissions, helping reduce the impact of greenhouse gas (GHG) emissions. However, the long-term impact of water-saving irrigation on soil organic carbon (SOC) - used here as an indicator of soil health and fertility - has not been explored. We therefore conducted a meta-analysis to assess the effects of common water-saving irrigation practices (alternate wetting and drying and mid-season drainage) on (i) SOC, and (ii) GHG emissions. Despite an extensive literature search, only 12 studies were found containing data to constrain the soil C balance in both continuous flooding and water-saving irrigation plots, highlighting the still limited understanding of long-term impacts of water-saving irrigation on soil health and GHG emissions. Water-saving irrigation was found to reduce emissions of CH4 by 52.3% and increased those of CO2 by 44.8%. CO2eq emissions were thereby reduced by 18.6% but the soil-to-atmosphere carbon (C) flux increased by 25% when compared to continuous flooding. Water-saving irrigation was also found to have a negative effect on both SOC - reducing concentrations by 5.2% - and soil organic nitrogen - potentially depleting stocks by more than 100 kg N/ha per year. While negative effects of water-saving irrigation on rice yield may not be visible in short-term experiments, care should be taken when assessing the long-term sustainability of these irrigation practices because they can decrease soil fertility. Strategies need to be developed for assessing the more long-term effects of these irrigation practices by considering trade-offs between water savings and other ecosystem services. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Alternate wetting and drying; carbon dioxide; methane; mid-season drainage; nitrous oxide; rice; soil organic carbon
语种	英语
scopus关键词	Carbon dioxide; Cultivation; Drying; Economic and social effects; Ecosystems; Floods; Gas emissions; Greenhouse gases; Health; Irrigation; Methane; Nitrogen oxides; Organic carbon; Soils; Water conservation; Wetting; Mid-season drainage; Nitrous oxide; rice; Soil organic carbon; WETTING AND DRYING; Soil pollution
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154523
作者单位	Stockholm University, Department of Physical Geography, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden; Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden; Nature Conservancy, Delmont, United States; Environmental Engineering and Management Research Group, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam
推荐引用方式 GB/T 7714	Livsey J.,Kätterer T.,Vico G.,et al. Do alternative irrigation strategies for rice cultivation decrease water footprints at the cost of long-term soil health?[J],2019,14(7).
APA	Livsey J..,Kätterer T..,Vico G..,Lyon S.W..,Lindborg R..,...&Manzoni S..(2019).Do alternative irrigation strategies for rice cultivation decrease water footprints at the cost of long-term soil health?.Environmental Research Letters,14(7).
MLA	Livsey J.,et al."Do alternative irrigation strategies for rice cultivation decrease water footprints at the cost of long-term soil health?".Environmental Research Letters 14.7(2019).