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| Extracellular enzyme activity and microbial diversity of saline-irrigated cotton field soil during the fallow period |
| Received:October 01, 2017 |
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| KeyWord:saline/brackish water irrigation;fluorescence microplate method;Biolog ECO microplate method;soil health;Hebei Low Plain |
| Author Name | Affiliation | E-mail | | LIANG Yue-ping | Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453002, China
Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LI Ke-jiang | Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, China | | | ZHANG Jun-peng | College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an 271000, China | | | WANG Guang-shuai | Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453002, China | | | GAO Yang | Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453002, China | | | SUN Jing-sheng | Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453002, China | | | DUAN Ai-wang | Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture, Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453002, China | duanaiwang@aliyun.com |
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| Abstract: |
| The use of saline water for agricultural irrigation is an economical and promising strategy for alleviating regional water scarcity. Therefore, the development of methods for evaluating the suitability of saline water for farmland irrigation is of great urgency. We used the fluorescence microplate method and Biology ECO system to compare the use of extracellular enzyme activity and microbial activity to evaluate soil health along a gradient of irrigation water salinity(0, 2, 4, 6, 8, and 10 g·L-1) in a fallow cotton field in the Hebei Low Plain. The results showed that saline water irrigation significantly influenced most of the soil extracellular enzyme activities, and increases in the irrigation water salinity significantly reduced the activities of α-glucosidase, cellulase, phosphatase, and β-xylosidase, but increased the activity of N-acetyl-D-glucosaminidase. The movements of β-glucosidase were not influenced by the brackish water. However, the ability of soil microorganisms to utilize carbon sources was altered by irrigation with saline water. Low-salt irrigation water(2 g·L-1) stimulated the microbial activity of the soil by increasing AWCD by 80%, but under higher salt concentrations(> 6 g·L-1), the ability of microorganisms to use carbon sources was restricted significantly. The irrigation of the cotton field with saline water had an immense impact on the characteristics of soil microorganisms and on the activity of extracellular enzymes during the fallow period. To accurately evaluate soil health, future studies should measure extracellular enzyme activity and microbial diversity during the fallow period. |
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