土壤CO_(2)排放对微咸水与淡水交替灌溉的响应  

Response of Soil CO_(2)Emissions to Brackish Water and Fresh Water Irrigation

作　　者：陈艺伟 管瑶[1] 贺兴宏[1] 李会文 王剑 王育强 范德宝 CHEN Yi-wei;GUAN Yao;HE Xing-hong;LI Hui-wen;WANG Jian;WANG Yu-qiang;FAN De-bao(College of Water Conservancy and Architecture Engineering,Tarim University,Alar 843300,Xinjiang,China)

机构地区：[1]塔里木大学水利与建筑工程学院,新疆阿拉尔843300

出　　处：《节水灌溉》2024年第8期102-109,共8页Water Saving Irrigation

基　　金：新疆生产建设兵团南疆重点产业创新发展支撑计划项目(2021DB017);中国农业大学、塔里木大学联合基金(2019TC157)。

摘　　要：为揭示微咸水与淡水交替灌溉模式对土壤CO_(2)排放通量变化规律的影响,研究极端干旱区棉田3种灌溉水质(矿化度分别为2、3、5 g/L)和3种不同配比咸淡水交替[微咸水∶淡水=1∶1(W1);微咸水∶淡水=1∶4(W2);微咸水∶淡水=1∶0(W3)]灌溉对土壤CO_(2)排放通量的影响。结果表明:①以2 g/L为对照,3 g/L微咸水与淡水交替灌溉处理CO_(2)累积排放通量减少了6.03%~7.19%;5 g/L微咸水与淡水交替灌溉处理CO_(2)累积排放通量减少了9.83%~10.15%;②在相同矿化度条件下,土壤CO_(2)累积排放通量为W2处理>W1处理>W3处理,淡水灌水量多的处理CO_(2)排放通量较大。③以2 g/L为对照,3 g/L和5 g/L处理产量平均提高了1.25%和3.64%,W1处理产量相较于W2、W3处理平均提高了24.02%和14.12%。随着灌溉水矿化度的增大,土壤CO_(2)排放通量减小,所有不同配比下矿化度为5 g/L的处理CO_(2)排放量均小于2、3 g/L的处理;在微咸水与淡水交替灌溉条件下,矿化度为3 g/L且微咸水∶淡水=1∶1的灌水处理,土壤CO_(2)排放通量降低且棉花产量最大,能够为合理利用微咸水及保护干旱区灌区农田生态环境提供理论依据。In order to reveal the effect of alternate irrigation mode of brackish water and fresh water on soil CO_(2)emission flux,three irrigation water quality(salinity of 2,3,5 g/L,respectively)and three different ratios of brackish and fresh water were studied in extreme arid areas[brackish water:light=1∶1(W1);brackish water:fresh water=1∶4(W2);Effects of brackish water vs.fresh water=1∶0(W3)]irrigation on soil CO_(2)emission flux.The results showed that:①Taking 2 g/L as the control,the cumulative CO_(2)emission flux of 3 g/L brackish water combined with fresh water was reduced by 6.03%~7.19%.The cumulative CO_(2)emission flux of 5 g/L brackish water and fresh water was reduced by 9.83%~10.15%.②Under the same salinity condition,the cumulative CO_(2)emission flux of soil was W2 treatment>W1 treatment>W3 treatment,and the CO_(2)emission flux of the treatment with more fresh water irrigation was larger.③Compared with 2 g/L,the yield of 3 g/L and 5 g/L treatments increased by 1.25%and 3.64%on average,and the yield of W1 treatment increased by 24.02%and 14.12%on average compared with 2 and W3 treatments.As salinity of irrigation water increased,soil CO_(2)emission flux decreased,and the CO_(2)emissions of all treatments with salinity of 5 g/L were lower than those of 2 and 3 g/L under different ratios.Among the alternating irrigation conditions,utilizing brackish water with a salinity of 3 g/L and a brackish water:fresh water ratio of 1∶1 resulted in reduced soil CO_(2)emission flux and the highest cotton yield.This could provide a theoretical basis for the rational utilization of brackish water and the protection of farmland ecological environment in arid irrigation areas.

关 键 词：咸淡水 交替灌溉 土壤CO_(2)排放通量 

分 类 号：S27[农业科学—农业水土工程]