Characteristics of Soil Physicochemical Properties of Plant Protection System for Salt Lake in Semi-arid Wind-sand Grassland Area
In order to investigate the effect of plant protection measures on the improvement of the soil in semi-arid wind-sand grassland area,the plant protection system of Chagannur Salt Lake was used as the research object,and the physical and chemical properties of the soil in different areas were measured by the method of field investigation combined with indoor experiment,and the changes of soil salinity,soil pH,soil particle size composition,soil organic matter and nitrogen,phosphorus and potassium content in 0-30 cm depth were analyzed.The results showed that,20 years after the construction of the plant protection system in Chagannur Salt Lake,the initial highly saline and alkaline soil environment had changed significantly under the synergistic effect of the protection zone to block wind erosion materials and plants to improve the soil.Compared with the dried lake center,the pH of each site in the plant protection system decreased to different degrees,and the soil salinity in the alkaline shield decreased by 75.34%;the clay and powder content of the soil in the alkaline shield increased significantly,increasing by 51.60%and 22.14%respectively compared with the dried lake center,and the coarse sand content decreased by 72.06%compared with the dried lake center.The contents of quick-acting potassium,quick-acting phosphorus and organic matter of the soil in the alkaline shield were the highest,which were 86%,39%and 55%of the dry lake center,respectively.The quick-acting nitrogen content of white thorn bushes in the transition zone was the highest,which was 28%of the dry lake center.Overall each nutrient content showed a significant correlation(P<0.05)with clay and powder grains.After 20 years of construction,the content of quick-acting potassium,quick-acting phosphorus and organic matter of the soil in the alkali plant protection zone had increased significantly compared with that at the beginning of the construction period,indicating that the plant protection system has a significant improvement effect on the soil.The research results could provide data support for the evaluation of the protective effect of the plant protection system in the salt lake,and could provide scientific basis for the control of wind erosion and regional vegetation restoration and reconstruction of the dry salt lake in the semi-arid sandy steppe area.
semi-arid sandy steppe zoneplant protection systemsoil physical and chemical propertiesChagannur Salt Lake
国家科技期刊平台
NSTL
万方数据
维普
