Yellow River irrigation area farmland ecological ditch constructing method

Abstract

The invention relates to a Yellow River irrigation area farmland ecological ditch constructing method. The Yellow River irrigation area farmland ecological ditch constructing method is used for avoiding water and soil losses of farmland drainage ditches and effectively blocking pollutants in farmland drainage water in semiarid Yellow River irrigation areas such as Inner Mongolia and Ningxia. The method specifically comprises fixing drainage ditch side slopes through 1-meter-long timber piles; planting slope protection plants of Chinese white poplar or dryland willow, rose willow and wheatgrass in an arbor-shrub-grass combined mode on slopes; arranging sacks filled with saw dust at the bottoms of the ditches and planting aquatic plants of cattail and reed on the sacks. The Yellow River irrigation area farmland ecological ditch constructing method has the advantages that the timber piles and the slope protection plants can effectively reduce water and soil losses due to collapse of the slopes during a farmland drainage process; the saw dust can effectively absorb the pollutants in the farmland drainage water such as N and P and the slope protection plants can absorb and utilize the pollutants in the farmland drainage water such as N and P; the aquatic plants can absorb and utilize water and the pollutants absorbed by the saw dust such as N and P. By means of the engineering and biological combined mode, the Yellow River irrigation area farmland ecological ditch constructing method can remarkably enhance the trash holding and pollutant sedimentation capability of the farmland drainage ditches, reduce agricultural non-point source pollution and achieve double-win effects of improving water and beautifying the environment.

Description

technical field [0001] The invention relates to a farmland ecological ditch construction method, which is suitable for the ecological construction of farmland drainage ditches in the upper and middle reaches of the Yellow River (Ningxia and Inner Mongolia). . Background technique [0002] The Ningmeng Hetao irrigation area located in the middle and upper reaches of the Yellow River is an important grain base in my country. The annual drainage of the Yellow River to irrigate farmland is nearly 9 billion m3. With the long-term excessive use of chemical fertilizers (especially nitrogen and phosphorus fertilizers) in the process of agricultural production, a large amount of remaining nutrients such as nitrogen and phosphorus have been directly discharged into the Yellow River with farmland drainage or entered the Yellow River after passing through the Wuliangsu Sea, resulting in an overall decline in the water quality of the lower reaches of the Yellow River. Seriously affect...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects that the farmland drainage ditches in the Ningmeng Yellow River Diversion Irrigation Area have poor degradation and interception effects on the pollutants in the drainage, the present invention proposes an ecological ditch construction mode suitable for this area, which is used to enhance the agricultural non-point source pollution of the farmland drainage ditches ability to digest and intercept