Effects Of Reclaimed Water Irrigation On Soil Physical And Chemical Properties Under Different Vegetation Types In Shendong Mining Area

In this paper, taking soil under different vegetation types in Shendong mining area(Daliuta, Halagou, Bulianta, Buertai) as the research object, and standardized analysis of the reclaimed water for green land irrigation. Furthermore, soil physical and chemical properties(including organic matter, available N, available P, available K, available B, pH, EC1:5) of green land under irrigating and no irrigating with reclaimed water were measured. The effect of reclaimed water irrigation on soil physical and chemical properties under different vegetation types and irrigation leaching requirement of Shendong salinization soil in surface were studied to provide a theoretical basis for the promotion and safe use of reclaimed water for irrigation in the area. The main conclusions are as follows:(1) From the point of reclaimed water quality in Shendong mining area. TDS(1420 mg·L-1), fluorine content(2.35 mg·L-1) and the boron content(4.12 mg·L-1) beyond the standards for irrigation water quality(GB5084-2005) of reclaimed water in Bulianta, and it is not suitable for green land irrigation. Except boron content slightly overweight, other indicators of reclaimed water are within the scope of the standards for irrigation water quality in Daliuta, Halagou, Bulianta, Buertai mining area, and it can be used for green land irrigation.(2) Conclusions of comparatively analyzed soil physical and chemical properties under different vegetation types with reclaimed water irrigation and non-irrigation(under natural conditions) are showed that: in this region, irrigation with reclaimed water have a certain influence on soil physical and chemical properties under different vegetation types. There are different degrees of salinization in surface soil and soil fertility values are very low uner most of the vegetation types. EC1: 5, organic matter, available N, P and K, available B content show the highest in surface soil. EC1: 5 and the content of organic matter, available N, P, K, B are more higher than control in 0-40 cm soil layer(under natural conditions), and Except Daliuta, EC1: 5 of other mining soil layer, organic matter content of Halagou, Bulianta, Buertai mining 0-40 cm soil layer, available N content of Halagou and Bulianta 0-20 cm soil layer, available P content of Daliuta, Bulianta 0-40 cm, available K content of Daliuta, Bulianta 0-40 cm soil layer, Halagou 0-10 cm soil layer, Buertai 0-20 cm soil layer, available B content of Halagou, Bulianta 0-40 cm, Daliuta 0-10 cm soil layer are significant difference compared with the control(P<0.05). PH has no significant difference compared with the control(P> 0.05).(4) The irrigation leaching requirement of saline soil in Shendong mining area is 7 PV. When using 7 PV water to rinse the saline alkali soil, can achieve good effect of desalination, and due to the combined effect of evaporation and transport of salt, surface soil electrical conductivity is the largest, then gradually decreases.