Abstract:

In order to explore the soil salt characteristics of natural Populus euphratica in Minqin oasis and the changing of the soil salt characteristics with time, as arid the protection of the ecological environment to provide reliable basis. The author used traditional statistics and semivari-ance analysis of geostatistics for studying on temporal variability of soil salt and it’s regulation during the Populus euphratica growth season in Minqin oasis. The results showed that soil salt content under the natural populus euphratica forests was between 0.55%-3.42%. Soil salt content of the study area increased with depth in vertical direction and the most obvious soil layer was the 0-40 cm, while 80-120 cm soil layer was steady. Soil salt content of the surface soil and subsurface soil was higher. The average value of surface soil salt content in JHCD, SWCD, SCKD was respectively 1.54%, 2.80%, 1.11%. Soil salt content of the natural Populus euphratica forests in the growing season was different. It was found that soil salt content of the spring was the highest, which was followed by the summer and autumn. Soil salt content of the natural Populus euphratica in middle-aged stage was bigger than the mature stage, while soil salt content of the mature stage was bigger than the overripe stage. The difference value between different year-old Populus euphratica was bigger in the SWCD. The variation efficient of soil salt content in Minqin belonged to middling variability and it decreased gradually with the depth in vertical direction.