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The spatial heterogeneity of soil is an important attribute of the ecosystem, and it is also the main reason for the spatial pattern. It has a close relationship with the function and process of the ecosystem. In the process of ecological succession of grassland communities, the spatial heterogeneity of soil properties is the main reason for the spatial distribution of vegetation. The study of the spatial heterogeneity of biological or abiotic factors is of great significance for describing the spatial autocorrelation of ecological factors, mapping of ecological factors, and designing sampling plans.
Mu Us Sand is one of the 12 major sand areas in China. It is a typical ecological transition zone and has a unique eco-geographical landscape. Domestic scholars have conducted a certain study on the soil characteristics of the southern margin of Maowusu sand land. Tang Yan et al. studied the soil moisture and grain size characteristics of shrub dunes and pointed out that vegetation determines the dynamic changes of soil moisture in sand dunes; Liu Jianzhong et al. The fertility decreased after ploughing; Xu Dongmei studied the characteristics of soil microorganisms, soil enzyme activity, and the physical and chemical properties of the vegetation and soil in the ecological transition zone of the southern margin of Mu Us sandy land.
In the study area, the semi-variogram of soil available potassium was fitted to a spherical model, and the coefficient of determination r2 was 0.943. The precision of the theoretical curve matched by the model was high, and the structural variance ratio was 0.882, indicating that the soil available potassium has strong spatial autonomy. Correlation; semi-variograms of total soil N and available P were fitted to the exponential model, and the coefficient of determination r2 was 0.552 and 0.944, respectively. Although the determination coefficient of total nitrogen was lower than that of available potassium and available phosphorus, it could still be Accepted. The structural variance ratios of soil total nitrogen and available phosphorus were 0.501 and 0.514, respectively, all belonging to moderate spatial autocorrelation.
To measure nutrients in desert areas, we need to take soil samples from the area. After some treatment of the samples, we directly use the soil nutrient tester to test. The whole test process takes about one hour. The instrument can measure the soil contains Nitrogen, phosphorus, potassium, with preservation function, print directly.
Soil nutrient fastness tester for spatial distribution of nutrients in desertification area
In desertification areas, soil nutrients are different from the nutrients in general areas and are very different. We all know that deserts are not suitable for plant growth. In addition to containing less water, the soil nutrients are Not suitable for plant growth.