Environmental Effects And Prediction Of Comprehensive Technology Integration Model On Brackish Water Utilization For Wolfberry In The Salinization Irrigation District

In the grim situation of the water diverting quantity is reduced and fresh water resources are scarced, development and utilization of saline water for irrigation has become an important way to ensure the sustainable development of Hetao Irrigation District.Explore a set of integration mode,demonstrate and tracking to it and do a Mid-simulation to research on the influence of the integration mode to regional environment have important theoretical significance and application value to agricultural development of Hetao irrigation district.The Hong Wei test field of Hetao Irrigation district in Inner Mongolia as the research object for the research.Calibration and verification of the SWAP model and MODFLOW model on the basis of field experiment.Using the SWAP model after the inspection to simulate so that determine the brackish water irrigation system optimization. The water irrigation system optimization and fertilization as the core technology.The cultivation.pruning and pest control and prevention as matching technology, to integrated a set of comprehensive technology integration mode for the plant of the local wolfberry,demonstrate and tracking monitor to it on wolfberry production,farmland soil and groundwater environment. The specific conclusion are as follows:(1) The models are constructed which describe soil water and salt migration and groundwater solute transport and they are reliability, through the model simulation we can know that the fresh-salty-salty mode is the mode which is the least amount of salt accumulation and has the minimum impact on regional environments determine the optimal irrigation mode for local is fresh-salty-salty mode.(2) The establishment of irrigation mode provides critical technical support for the integration mode.the results of demonstrate and tracking showed that the integration pattern saves fresh water,ensures the stable of wolfberry production and ensures the balanced development of soil environment and groundwater environment.(3) The research is conducted on the situation of accumulated salt under the integration pattern.The mild simulation has been done on the changes of groundwater level and groundwater mineralization.The results showed that soil salinity increased slightly in each soil layer under the integration patterns. Soil salinity showed an increasing trend year by year, the soil salinity reached 0.056% after 5 years. Most of soil salinity is less than 0.1% which grows well and has high yield for wolfberry(ningxia wolfberr),so soil environment still suitable for wolfberry’s grow after 5 years.The average groundwater level showed an decreasing trend year by year under the integration pattern and the fall is unlikely,groundwater mineralization showed an decreasing trend year by year,the decrease of groundwater level and groundwater mineralization improves groundwater mineralization.this showed the integration pattern not only can not increase groundwater level and groundwater mineralization but also plays a role to improving the groundwater conditions.The results showed that the integrated model suitable for the cultivation of local wolfberry and has practical significance to promote.It provides a scientific basis for the sustainable utilization of local water resources and sustainable development of local farmland environment and groundwater environment.