He Xinlin

Transformation of surface water and groundwater and water balance in the agricultural irrigation area of the Manas River Basin, China

Calculation of the water balance is very important to relieve the pressure on water resources in arid agricultural irrigation areas. This research focused on irrigation water balance calculations in the Manas River Basin of the southern margin of the Junggar Basin of China, and aimed to analyze the groundwater level dynamic trend and response characteristics of the basin water cycle under water-saving irrigation measures. The surface water and groundwater coupling model of MIKE 11-Visual MODFLOW was used to simulate rainfall runoff in mountainous areas, and quantify the contribution of water balance components in the plain irrigation area. Convergence of the delayed watershed in the mountain area was obvious, and when the river runoff exceeded 200 m3/s, the error in the runoff simulation was large. The water balance in the plain agricultural irrigation area was in a negative equilibrium state, and the difference between recharge and discharge was −2.65 billion m3. The evapotranspiration was 24.49 billion m3 under drip irrigation, accounting for only approximately 51% of the total discharge. The lateral discharge of the unsaturated and saturated aquifers was 15.38 billion m3, accounting for approximately 32% of the total discharge. The main reason for the groundwater decline in the irrigation area was closely related to the extraction of groundwater, because the amount of recharge and discharge in the natural state was approximately identical. The MIKE 11-Visual MODFLOW model produced accurate results, and the research method provided a new exploration technique to quantify the effect of water supply mode on the groundwater table. The model is suitable for the management of water resources in arid areas. Keywords: water balance, coupling model, surface water and groundwater, water saving irrigation, Manas River Basin DOI: 10.25165/j.ijabe.20171004.3461 Citation: Yang G, He X L, Li X L, Long A H, Xue L Q. Transformation of surface water and groundwater and water balance in the agricultural irrigation area of the Manas River Basin, China. Int J Agric & Biol Eng, 2017; 10(4): 107–118.

The study of influence on water-salt transportation under saline drip irrigation

Through 3salinity gradients (13.2g / L, 23.2g / L, 27.2g / L) saline drip irrigation, The results showed: in the surface and deep, the peak amount of salt accumulated is about 50cm away from the emitter, and the middle layer varied from 25cm ∼ 50cm; in the soil below 20cm, a positive correlation between the salinity distribution and water distribution in 13.2g / L and 23.2g / L treatments, and negative correlation in 27.2g / L treatment; the salinity under drip irrigation conditions are very good on the surface of salt leaching effects, sand for the development of vegetation water to provide support. The result will provide theoretical support for the development of drip irrigating sand vegetation with salty water.

The effect of irrigtion on water consumption and yield of cotton under drip irrigation in Saline land

Aiming at the problem of water shortage and soil salinization the paper studied the effect of irrigtion on water consumption and yield of cotton under drip irrigation in saline land thruogh test pit experiment, the results showed that water consumption of cotton increased with the increasment of irrigation, water use efficiency decreased with the increasment of irrigation, by setting the function relationship among irrigation, water consumption and yield it was found that a quadratic function relationship was showed between irrigation and yield, as well as between water consumption and yield, a linear relationship was showed between irrigation and water consumption, finally it was obtained when irrigation was 448.49mm ∼ 461.19mm the highest yield of seed cotton was 5301.44 kg/hm2∼5309.35 kg/hm2, which will provide a theoretical basis for the development and utilization of saline land and the solution of water crisis.