Impact of climatic warming on soil salinity and irrigation amount of Yellow River irrigation areas in Ningxia Hui Autonomous Region

Climatic warming has intensified soil moisture evaporation and led the soil salinity moving upward, which results in salinity increase and aggravated the harm of saline and alkaline of the soil. This paper has, on the basis of location observational data of soil salinity and meteorological data in the recent 35 years, researched the influence of climatic warming on soil salinity change of Yellow River irrigation areas in Ningxia Hui Autonomous Region. The result shows that the total soil salt content has been an increasing trend because of global climatic warming in the recent 35 years, and total salt content of light, moderate and severe salty soil has increased by 0.08 g/kg, 0.13 g/kg and 0.19 g/kg, respectively, in Yellow River irrigation areas in Ningxia Hui Autonomous Region. When the temperature increased by 0.5-3.0℃, the irrigation amount of light, moderate and severe salty soil has increased by 8.2%-9.1%, 8.2%-8.7% and 8.3-8.8%, respectively, and the total irrigation amount has been increased by 129-140 million m3.