Saline-Sodic Soils:Potential Sources of Nitrous Oxide and Carbon Dioxide Emissions?

查看全文 作　　者：Upasana [1]GHOSH;Resham [1]THAPA;Thomas [1]DESUTTER;HE [2]Yangbo;Amitava [1]CHATTERJEE

机构地区：[1]Department of Soil Science,North Dakota State University;[2]Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of the Yangtze River),Ministry of Agriculture,Huazhong Agricultural University

出　　处：《Pedosphere》索引2017年第27卷第1期,共11页

摘　　要：Increasing salt-affected agricultural land due to low precipitation,high surface evaporation,irrigation with saline water,and poor cultural practices has triggered the interest to understand the influence of salt on nitrous oxide(N_2O) and carbon dioxide(CO_2)emissions from soil.Three soils with varying electrical conductivity of saturated paste extract(EC_e)(0.44-7.20 dS m^(-1)) and sodium adsorption ratio of saturated paste extract(SARe)(1.0-27.7),two saline-sodic soils(S2 and S3) and a non-saline,non-sodic soil(S1),were incubated at moisture levels of 40%,60%,and 80%water-filled pore space(WFPS) for 30 d,with or without nitrogen(N)fertilizer addition(urea at 525 μg g^(-1) soil).Evolving CO_2 and N2 O were estimated by analyzing the collected gas samples during the incubation period.Across all moisture and N levels,the cumulative N_2O emissions increased significantly by 39.8%and 42.4%in S2 and S3,respectively,compared to S1.The cumulative CO_2 emission from the three soils did not differ significantly as a result of the complex interactions of salinity and sodicity.Moisture had no significant effect on N_2O emissions,but cumulative CO_2 emissions increased significantly with an increase in moisture.Addition of N significantly increased cumulative N_2O and CO_2 emissions.These showed that saline-sodic soils can be a significant contributor of N_2O to the environment compared to non-saline,non-sodic soils.The application of N fertilizer,irrigation,and precipitation may potentially increase greenhouse gas(N2O and CO_2) releases from saline-sodic soils. 关键词：二氧化碳排放量盐碱化土壤氧化亚氮 CO2排放量咸水灌溉 N20 N2O N累积

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Saline-Sodic Soils:Potential Sources of Nitrous Oxide and Carbon Dioxide Emissions?

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