Research on soil quality under traditional drainage and ecological water storage models of saline and alkaline land

Abstract

This paper aims to study halide under traditional drainage and ecological water treatment of saline-alkali soil through bulk density, porosity, moisture content, soluble and nutrient characteristics in Shaanxi, to analyze the different governance mode of different soil physical and chemical characteristics to provide scientific basis for saline-alkali land management. Saline-alkali land model test was set in Shaanxi Fuping, respectively set up traditional drainage and ecological water treatment, analysis soil bulk density, porosity, electric conductivity, total salt, organic matter, total N, available K, available P and fractal dimension of 0-30 cm soil layer; Analysis soil moisture content and reservoir capacity of 0-160 cm soil layer, and comprehensive analysis the average fractal dimension of soil and soil nutrient average correlation in 0-30 cm soil depth. Results show that: (1) in 0-30 cm soil depth, two kinds of mode, the soil bulk density and porosity appear consistent, the soil bulk density can be reduced, and ecological water storage mode can effectively increase the soil porousness compare with traditional drainage mode. (2) Under the same amount of water, in the 0-160 cm soil layer, the average soil moisture and average water storage capacity under the ecological water storage treatment were 4.47% and 2.57% higher than the traditional drainage treatment. (3) In the 0-30 cm soil layer, the traditional drainage and ecological water storage treatment significantly reduced the soil pH, conductivity and total salt content before the test, and the ecological water storage treatment decreased significantly; (4) In the 0-30 cm soil layer, the nutrient content of each treatment showed the same trend, which decreased with the increase of soil layer, and the average content of organic matter, total nitrogen, available potassium and available phosphorus under ecological storage treatment was higher than that of traditional drainage treatment. The height was 18.96%, 4.76%, 10.67% and 9.35%, and the difference between treatments was significant (P<0.05). (5) In the 0-30 cm soil layer, the fractal dimension of soil aggregates in dry and wet sieves showed opposite trend, and there was a good linear relationship with soil average bulk density, organic matter, total nitrogen, available potassium and available phosphorus (R2 = 0.8006∼0.9499), the difference was significant (P<0.05). In summary, the ecological water storage treatment can effectively improve soil physical and chemical properties, improve soil stability and soil quality, and achieve good salinity treatment.