Effects of Alternate Wetting and Drying Irrigation on Methane and Nitrous Oxide Emissions From Rice Fields: A Meta-Analysis

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Chenxi Zhao, Rangjian Qiu, Tao Zhang, Yufeng Luo, Evgenios Agathokleous
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引用次数: 0

Abstract

Reducing water input and promoting water productivity in rice field under alternate wetting and drying irrigation (AWD), instead of continuous flooding (CF), are vital due to increasing irrigation water scarcity. However, it is also important to understand how methane (CH4) and nitrous oxide (N2O) emissions and global warming potential ( GWP CH 4 + N 2 O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ of CH4 and N2O) respond to AWD under the influence of various factors. Here, we conducted a meta-analysis to investigate the impact of AWD on CH4 and N2O emissions and GWP CH 4 + N 2 O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ , and its modification by climate conditions, soil properties, and management practices. Overall, compared to CF, AWD significantly reduced CH4 emissions by 51.6% and GWP CH 4 + N 2 O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ by 46.9%, while increased N2O emissions by 44.0%. The effect of AWD on CH4 emissions was significantly modified by soil drying level, the number of drying events, mean annual precipitation (MAP), soil organic carbon content (SOC), growth cycle, and nitrogen fertilizer (N) application. Regarding N2O emissions, mean annual temperature (MAT), elevation, soil texture, and soil pH had significant impacts on the AWD effect. Consequently, the GWP CH 4 + N 2 O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ under AWD was altered by soil drying level, soil pH, and growth cycle. Additionally, we found that MAP or MAT can be used to accurately assess the changes of global or national CH4 and N2O emissions under mild AWD. Moreover, increasing SOC, but not N application, is a potential strategy to further reduce CH4 emissions under (mild) AWD, since no difference was found between application of 60–120 and > 120 kg N ha−1. Furthermore, the soil pH can serve as an indicator to assess the reduction of GWP CH 4 + N 2 O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ under (mild) AWD as indicated by a significant linear correlation between them. These findings can provide valuable data support for accurate evaluation of non-CO2 greenhouse gas emissions reduction in rice fields under large-scale promotion of AWD in the future.

Abstract Image

Abstract Image

干湿交替灌溉对稻田甲烷和氧化亚氮排放影响的meta分析
在干湿交替灌溉(AWD)下,减少水分投入,提高水分生产力,而不是连续灌溉(CF),是日益严重的灌溉缺水问题的关键。然而,在各种因素的影响下,了解甲烷(CH4)和氧化亚氮(N2O)排放和全球变暖潜势(GWPCH4+N2¹O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ of CH4和N2O)如何响应AWD也是很重要的。本文通过荟萃分析,探讨了AWD对CH4和N2O排放以及GWPCH4+N2 + O $$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$的影响,以及气候条件、土壤性质和管理措施对其的影响。总的来说,与CF相比,AWD显著减少了51.6的CH4排放% and GWPCH4+N2⁢O$$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ by 46.9%, while increased N2O emissions by 44.0%. The effect of AWD on CH4 emissions was significantly modified by soil drying level, the number of drying events, mean annual precipitation (MAP), soil organic carbon content (SOC), growth cycle, and nitrogen fertilizer (N) application. Regarding N2O emissions, mean annual temperature (MAT), elevation, soil texture, and soil pH had significant impacts on the AWD effect. Consequently, the GWPCH4+N2⁢O$$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ under AWD was altered by soil drying level, soil pH, and growth cycle. Additionally, we found that MAP or MAT can be used to accurately assess the changes of global or national CH4 and N2O emissions under mild AWD. Moreover, increasing SOC, but not N application, is a potential strategy to further reduce CH4 emissions under (mild) AWD, since no difference was found between application of 60–120 and > 120 kg N ha−1. Furthermore, the soil pH can serve as an indicator to assess the reduction of GWPCH4+N2⁢O$$ {\mathrm{GWP}}_{{\mathrm{CH}}_4+{\mathrm{N}}_2\mathrm{O}} $$ under (mild) AWD as indicated by a significant linear correlation between them. These findings can provide valuable data support for accurate evaluation of non-CO2 greenhouse gas emissions reduction in rice fields under large-scale promotion of AWD in the future.
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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