首页|Long-term saline water irrigation decreased soil organic carbon and inorganic carbon contents
Long-term saline water irrigation decreased soil organic carbon and inorganic carbon contents
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NSTL
Elsevier
? 2022 Elsevier B.V.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.
Saline water irrigationSoil aggregateSoil inorganic carbonSoil organic carbonSoil water-salt content
Key Laboratory of Agricultural Water Resources The Center for Agricultural Resources Research Institute of Genetics and Developmental Biology The Chinese Academy of Sciences
Key Laboratory of Crop Drought Resistance Research of Hebei Province Institute of Dryland Farming Hebei Academy of Agriculture and Forestry Sciences
NSTL
Elsevier
