Abstract
In order to explore the rule of groundwater salt dynamic in Hetao Irrigation District, a typical monitoring area was selected as the research area in Yongji Irrigation Area of Hetao Irrigation District. The groundwater level and groundwater salinity were analyzed during the year and inter-annual variation in 2008-2013. The groundwater level showed an obvious seasonal change trend during the year variation. The groundwater level was at the peak value after spring irrigation and autumn irrigation. The groundwater level was at the low value before melting and autumn irrigation. The groundwater level had an obvious periodicity during the inter-annual variation. The groundwater level could keep a relatively stable for many years. The groundwater salinity showed an obvious seasonal change trend during the year variation. The groundwater salinity was greatly affected by irrigation and had a decreased trend after irrigation. The groundwater salinity had an obvious periodicity during the inter-annual variation and could keep a relatively stable for many years in cultivated land. The groundwater salinity had an increased trend during the inter-annual variation in wasteland. The wasteland was the drainage area for cultivated land. The wasteland had an obvious role in adjusting salt dynamic balance in Hetao Irrigation District.
Highlights
For arid and semi-arid areas, groundwater is a unique water resource, which plays an important role in maintaining social and economic development and agricultural production
Due to the arid climate conditions, soil moisture and groundwater evaporation are strong, which will cause the gradual accumulation of soil salt and the increase of groundwater salinity, which will cause the harm of soil secondary salinization and seriously threaten the agricultural production in arid and semi-arid areas
The results show that the groundwater mineralization degree is mainly affected by the annual variation of groundwater salinity in cultivated land the salinity of groundwater in cultivated land flows to wasteland along with groundwater flow, resulting in the increase of groundwater mineralization in wasteland
Summary
For arid and semi-arid areas, groundwater is a unique water resource, which plays an important role in maintaining social and economic development and agricultural production. In order to solve the problem of soil secondary salinization in arid and semi-arid areas, researchers at home and abroad have carried out a lot of researches on the dynamic law of groundwater salt and the regulation of groundwater level[1,2]. The Hetao Irrigation Area in Inner Mongolia, located in the upper reaches of the Yellow River Basin, is a typical saline alkali irrigation area because of its dry climate, less rainfall, strong evaporation, shallow groundwater level and high salt content in soil parent material[3]. The dynamic changes of groundwater salt in different landscape units of Hetao irrigation area are less studied. The research results can provide scientific basis for water resources management and effective utilization in Hetao irrigation area
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