| 引用本文: | 李会文,管瑶,贺兴宏,等.咸淡水组合灌溉模式对棉田土壤CO2日排放特征的影响[J].灌溉排水学报,0,():-. |
| LI Huiwen,GUAN Yao,HE Xinghong,et al.咸淡水组合灌溉模式对棉田土壤CO2日排放特征的影响[J].灌溉排水学报,0,():-. |
|
| 摘要: |
| 【目的】探究咸淡水组合灌溉对棉田CO2日排放的影响,为土壤固碳减排和合理利用水资源提供理论参考。【方法】采用4种水质,即淡水和矿化度分别为2、3和5g/L的微咸水；4种咸淡水施配比例,即微咸水:淡水为1:1、1:4、4:1和1:0,按照先咸后淡顺序进行膜下滴灌,采用静态箱—气相色谱法采集和分析棉田在灌水前后土壤CO2日排放特征。【结果】结果表明,与淡水灌溉相比,矿化度为2g/L、3g/L和5g/L微咸水与淡水组合灌溉土壤CO2日平均排放量分别降低了12.64~24.35%、18.30~26.69%和22.16~28.57%。淡水灌溉处理下土壤CO2累计排放量显著高于其他各处理,矿化度为2g/L与3g/L和5g/L咸淡水组合灌溉下土壤CO2累计排放量存在显著差异,但3g/L和5g/L处理之间无显著差异。在相同微咸水矿化度条件下,咸淡水施配比例为1:1、1:4、4:1和1:0土壤CO2日平均排放量表现为1:4<1:1<4:1<1:0。相关分析结果表明,土壤CO2排放通量与箱内气体温度、土壤含水率、pH值和电导率呈显著相关关系。【结论】在微咸水水质和咸淡水组合灌溉条件下,选用2g/L微咸水与淡水按1:4施配比例灌溉对土壤盐分积累和CO2气体排放影响较小,是灌区合理利用微咸水的一种灌溉方案。 |
| 关键词: 微咸水水质;组合灌溉;灌溉配比;土壤CO2日排放通量 |
| DOI： |
| 分类号:S152.6 |
| 基金项目: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) |
|
| Effects of combined saline and fresh water irrigation patterns on daily soil CO2 emission characteristics of cotton fields |
|
LI Huiwen1, GUAN Yao1, HE Xinghong2, FAN Debao1, WANG Yuqiang1
|
|
1.School of Water Conservancy and Architectural Engineering,Tarim University;2.Nanjiang Geotechnical Engineering Research Center of Tarim University
|
| Abstract: |
| 【Objective】 The effect of saline-fresh water irrigation on daily CO2 emission in cotton fields was explored, which provided theoretical reference for soil carbon sequestration and emission reduction and rational utilization of water resources.【Method】 Four kinds of water quality were adopted, namely fresh water and brackish water with salinity of 2,3 and 5g/L respectively. Four kinds of brackish water: fresh water ratios are 1:1, 1:4, 4:1 and 1:0. Drip irrigation under film was carried out according to the order of first brackish water and then light water. Static box-gas chromatography was used to collect and analyze the daily emission characteristics of soil CO2 in cotton fields before and after irrigation.【Result】 The results showed that, compared with fresh water irrigation, the average daily CO2 emission of soil irrigated by combination of brackish water and fresh water with salinity of 2g/L, 3g/L and 5g/L decreased by 12.64~24.35%, 18.30~26.69% and 22.16~28.57% respectively. The cumulative emission of soil CO2 under fresh water irrigation is significantly higher than that under other treatments. There is a significant difference between the salinity of 2g/L and the salinity of 3g/L and 5g/L saline-fresh water combined irrigation, but there is no significant difference between 3g/L and 5g/L treatments. Under the condition of the same salinity of brackish water, the average daily CO2 emission of soil with the ratio of brackish water to fresh water of 1:1, 1:4, 4:1 and 1:0 is 1:4<1:1<4:1<1:0. The correlation analysis results show that the soil CO2 emission flux has a significant correlation with the gas temperature in the tank, soil moisture content, pH value and electrical conductivity.【Conclusion】 Under the condition of brackish water quality and brackish-fresh water combination irrigation, the application ratio of 2g/L brackish water to fresh water at 1:4 has little influence on soil salt accumulation and CO2 gas emission, which is an irrigation scheme for rational utilization of brackish water in irrigation areas. |
| Key words: brackish water quality;combined irrigation;irrigation proportion;daily CO2 emission from soil |
