数字农科院2.0

Impacts of Saline Water Irrigation on Soil Respiration from Cotton Fields in the North China Plain

文献类型： 外文期刊

作者： Shuang Zhou;Yang Gao;Junpeng Zhang;Jie Pang;Abdoul Kader Mounkaila Hamani;Chunping Xu;Hongkai Dang;Caiyun Cao;Guangshuai Wang;Jingsheng Sun

作者机构：

关键词： cotton;cotton yield;saline water irrigation;soil physical and chemical properties;soil respiration;structural equation model

期刊名称： Agronomy

ISSN： 2073-4395

年卷期： 2023 年 13 卷 5 期

页码：

收录情况： SCIE（2023版）

摘要： Saline water irrigation has been widely used for crop production where agriculture is short of freshwater. However, information about the response of soil respiration to saline water irrigation is limited. To identify the effect of saline water irrigation on soil respiration, the experiment based on long-term saline water irrigation cotton fields (since 2006) was conducted in the Heilonggang area in 2021. Five salinity levels in irrigation water were tested (3.4 [S1], 7.1 [S2], 10.6 [S3], 14.1 [S4], and 17.7 dS m−1 [S5]), and deep ground water (1.3 dS m−1) was used as the control (CK). After 15 years of saline water irrigation, we monitored soil physicochemical properties and soil respiration. In addition, we developed a structural equation model of the relationship between them. The results demonstrated that saline water irrigation significantly reduced soil water-stable aggregate content and porosity by 4.42–45.33% and 6.52–14.10%, respectively, and attenuated soil cellulase, α-glucosidase, and alkaline phosphatase activity. Soil respiration under saline water irrigation was significantly reduced by 5.28–33.08%. Moreover, saline water irrigation with salinity below 10.6 dS m−1 had no significant effect on cotton yield. Moreover, soil salinity (62%), water-stable aggregate content (46%), and soil porosity (25%) had significant effects on soil respiration, and soil porosity had a significant positive effect on soil alkaline phosphatase activity according to the structural equation model. Overall, saline irrigation with salinity below 10.6 dS m−1 can alleviate water shortages and reduce soil carbon emissions without affecting cotton yield in the study area.

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