Study of the ecological security technology in the northern plains of the Shiyanghe River basin based on ecological water requirement
Aiming at the increasingly serious ecological environment in the Shiyanghe River basin,in this paper,the calculation of ecological water requirement based on the variation theory was taken as a key point.The target year of groundwater recovery was determined with Mann-kendall non-parameter test method,and the ecological function areas in the northern plains of the Shiyanghe River basin were divided.The ecological water requirement of target year was calculated by Dacy Law and Aviriyanover's Empirical Formula.Finally,the ecological security measures were correspondingly proposed.It is found that the northern plains of the Shiyanghe River basin should be divided into five ecological function subareas and 16 three-level areas through using of ecological function division method.1977 is the target year for groundwater recovery; the amount of ecological water requirement is 55.95 × 108-74.10 × 108 m3 when the groundwater level returns to the level in 1977.The amount of ecological water requirement will be 1.66 × 108 m3and 1.80 × 108 m3per year,respectively,to the ecological goals in 2015 and 2020.Considering that the groundwater recovery will be slow and long-term,it is suggested to give priority to the ecological water requirement under the conditions of normal growth of vegetation,and compressing the areas of cultivated lands and irrigation quota to ensure the groundwater recovery.
variation theoryShiyanghe Rivernorthern plainecological water requirement
NETL
NSTL
万方数据
维普
