Long-term saline water irrigation decreased soil organic carbon and inorganic carbon contents

文献类型： 外文期刊

第一作者： Dong, Xinliang

作者： Dong, Xinliang;Wang, Jintao;Zhang, Xuejia;Liu, Xiaojing;Sun, Hongyong;Dang, Hongkai;Singh, Bhupinder Pal

作者机构：

关键词： Saline water irrigation; Soil water-salt content; Soil inorganic carbon; Soil organic carbon; Soil aggregate

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.7； 五年影响因子：6.6 ）

ISSN： 0378-3774

年卷期： 2022 年 270 卷

页码：

收录情况： SCI

摘要： Soil carbon is a key component of ecosystem functions and is crucial to global climate conservation and crop productivity. Saline water irrigation can maintain crop yield inmost world regions of freshwater shortage. However, saline water irrigation may also induce soil salt accumulation, which would result in the change of soil physical or chemical properties. Saline water irrigation's effect on soil organic carbon (SOC) and soil inorganic carbon (SIC) contents is of little concern. In this study, we irrigated soil with 1 g L (-1), 4 g L-1 and 8 g L (-1) saline water in a winter-wheat and summer-maize rotation system. After 14 years of irrigation, we sampled soils in a winter wheat and summer maize rotation system, and analyzed soil water, soil salt, SOC, and SIC contents. The results showed that, compared with 1 g L (-1) water irrigation, 8 g L-1 saline water irrigation significantly increased soil water and salt contents. Moreover, 8 g L (-1) saline water irrigation significantly decreased SOC and SIC contents in the 0-20 cm soil layer (p < 0.05) and mainly decreased SOC content in > 1 mm aggregates and wheat-derived SOC content in bulk soil. In comparison, 4 g L (-1) saline water had no significant effect on soil water, soil salt, SOC, and SIC contents. These results indicated that a high concentration of saline water irrigation is harmful for soil carbon sequestration, while a low concentration of saline water did not affect soil carbon sequestration. Thus, using no more than 4 g L (-1) saline water irrigation for 14 years can maintain soil carbon storage in the water shortage areas.

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