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[1]SUN Lin,LUO Yi.Study on the Evolution Trends of Soil Salinity in Cotton Field under Long-term Drip Irrigation[J].Research of Soil and Water Conservation,2013,20(01):186-192.

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Study on the Evolution Trends of Soil Salinity in Cotton Field under Long-term Drip Irrigation

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 01 Page number: 186-192 Column: Public date: 2013-02-28

Title:: Study on the Evolution Trends of Soil Salinity in Cotton Field under Long-term Drip Irrigation

Author(s):: SUN Lin¹, LUO Yi²; 1. Key Laboratory of Ecosystem Network Observation and Modeling, Research Institute of Geographic Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China;
2. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China

Keywords:: drip irrigation under film; Hydrus 2D model; soil salinity; mathematical simulation

CLC:: S156.4⁺1

DOI:: -

Abstract:: Drip Irrigation under film is a prevailing irrigation method in arid area of northwest China due to its outstanding efficiency of water saving and production increases. However, issue on rise of salt accumulation in crop field under long-term drip irrigation should been dealt with as soon as possible. In this paper, the Hydrus 2D model was calibrated and validated by using the observed data of dynamics progress of soil salt obtained from field experiment which was conducted in Manasi river irrigation district, Xinjiang Uygur Autonomous Region. The result showed that Hydrus 2D model was a useful tool to simulate soil salt distribution and accumulation under drip irrigation. Then soil salt accumulation in different quota brackish water under long-term drip irrigation was simulated and analyzed. We found that soil salt increased with the irrigating years, but it finally reached a stable equilibrium for its increasing speed got slower which was chiefly due to salt leaching increase while transpiration was suppressed by increased soil salt. The equilibrium times were 10, 15, 20 and 35 years, respectively, while then contents of irrigated water salinity were 4.8, 3.2, 1.6 and 0.8 g/L and with irrigation water rate of 420 mm, contents of soil salt at root zone were 4.8, 3.2, 1.6, 0.8 mg/cm³, respectively, and corresponding guarantee rate of transpiration requirement were 72%, 80%, 85% and 91%, respectively. In order to maintain soil salt below the tolerance of crop, contents of irrigated water salinity were 4.8, 3.2, 1.6 and 0.8 g/L, rates of irrigation water should be more than 495, 470, 425 and 395 mm, respectively.

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