Study On The Change Of Soil Salinity In The Exploitation And Use Of Wasteland

The experiment that the influence of different planting and utilization way on content of soil salt in Karamay Agriculture Develop Area and the influence of persist using drip irrigation under a film on soil salinity and nutrient in Shihezi 147 Tuan. Through this experiment solves the balanceof water and soil or water and salt in wasteland development, provide science gist for establish the modern agriculture technology system and safeguard the safety of land use. The main findings as follows:1. In the plant identical crops situation, the plant years and the soil salt content have the inverse ratio, also along with the plant years increase, the salt content tends to stably, the salinity massively gathers at 30-60cm; After the wasteland assarted forest land,the salt composition type has not changed, but assart wasteland after lawn,the salt composition type becomes SO42- type and the farmland becomes Cl--SO42- type.2. The lowest soil salt content is farmland under same planting year and different land utilization way; in the forestland soil profile the salinity has a more obvious layer to gather the surface, in the farmland the soil salinity is mainly gathers at 30-60cm, the lawn salinity content deepens along with the depth increases; in the different plant structure, the continuous cropping soil salt content far is lower than the rotation cropping, but in the rotation cropping, the melon/cotton salt content is lowest;the salt composition type of continuous cropping becomes Cl--SO42- type and the rotation cropping bexomes SO42- type .3.Subsoil water levels changes into different year is 2006 compared in 2005 to rise 1.94 meters;the subsoil water level changes into a year: Spring lowest, summer is next, the autumn is highest; the soil salinity dynamic change for March > November > July, showed the soil passes through a year plant, the soil salinity content drops.4. The soil salt content along with using drip irrigation under a film of years increase which first rises reduces again; and along with the use drip irrigation under a film of years increase, the level which the salinity massively gathers also is approaching the surface migration; the use drip irrigation under a film of years has not affected to the soil salinity composition type,the soil nutrient in each level change is inconsistent.