| Cite this article: | 刘杰云,张文正.水分管理及生物质炭对稻田土壤含水率及pH的影响[J].灌溉排水学报,0,():-. |
| Liu Jie-yun,Zhang Wenzheng.水分管理及生物质炭对稻田土壤含水率及pH的影响[J].灌溉排水学报,0,():-. |
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| Effects of Water Management and Biochar Amendment on Soil Water Content and pH in Double Rice Cropping Field in Subtropical China |
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Liu Jie-yun1, Zhang Wenzheng1, Shen Jian-lin2, Tang Hong3, Wang Cong4, Qiu Hu-sen5
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1.Farmland Irrigation Research Institute,Chinese Academy of Agricultural Sciences;2.Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences;3.College of Environment and Life Science,Kaili University;4.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management,Guangdong Institute of Eco-environmental Science and Technology;5.Suzhou University
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| Abstract: |
| 【Background】 Rice is one of three main crops in China. Meanwhile, paddy field is the main water user. The traditional flooding irrigation wasted plenty of water resource, and caused water pollution. Double rice cropping system is the typical planting patterns in subtropical China. The soil in subtropical area is acid. How to irrigate reasonably to reduce water waste and reduce soil acidity is a difficult problem in subtropical China.【Objective】Double rice cropping system is the typical planting patterns in subtropical China. Flooding and intermittent irrigation were the main water management methods in double rice cropping system. Biochar amendment can increase soil water holding capacity and neutralize soil acidity. While, the effects of different water management and biochar amendment on soil water content and soil pH in subtropical area were not clear, and plenty of field study is needed.【Method】A field plot experiment was conducted to study the influences of water management and biochar amendment on soil water content and pH in double rice cropping field during the early rice, late rice and fallow season in subtropical area. Water management types were continuous flooding (CF) and intermittent irrigation (IF). Three biochar application rates were arranged in intermittent irrigation method: no biochar treatment (IF), added 24 t hm-2 biochar treatment (LB+IF) and added 48 t hm-2 biochar treatment (HB+IF) .【Result】In comparison with CF treatment, soil water content with IF treatment was not significantly decreased in the early rice and late rice seasons, which may result from the precipitation during drainage period. Biochar amendment did not change soil water contents during the early rice season and late rice season, but reduced soil water content during the fallow season, which may attributed to that fine textured biochar occupied soil pore space and reduced soil porosity. The annual average soil water content of CF, IF, LB+IF and HB+IF treatments were 0.47, 0.40, 0.37 and 0.39, respectively. Intermittent irrigation reduced annual average soil water contents compared to continuous flooding, but biochar amendment did not significantly affect annual average soil water contents. IF treatment reduced soil pH by 0.22 and 0.57 during the early rice season and late rice season as compared to CF treatment. While, no difference of soil pH was observed between IF and CF treatments during the fallow season. Due to the alkalinity, biochar amendment can increase soil pH, and soil pH increased with the increasing of biochar application rates. Compared to IF treatment, biocahar treatments increased soil pH by 0.23~0.68 in the early rice season and 0.17~0.60 during in the early rice season and late rice season.【Conclusion】From above, water management can affects soil water contents and pH. Intermittent irrigation reduced soil pH. Biochar amendment, especially the high rate biochar amendment, can increase soil pH and neutralize the pH reduction of with intermittent irrigation in acid soil. The results of this study can supply the theoretical support for the intermittent irrigation and biochar amendment in double rice cropping system in subtropical China. |
| Key words: water management; biochar; double rice cropping field; soil water content; soil pH |
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