Abstract:
Taking alpine steppe Bayanbulak Grassland as a research object, and based on the differentiation of grassland utilization ways, soil degradation degrees and vegetation types of different grasslands, the effects of the grassland degradation degree of different grasslands on soil physical and chemical properties were analyzed, and the effects of vegetation and surface characteristics as well as grassland use patterns on soil fertility revealed. The results showed that alpine marsh grasslands and alpine grasslands were utilized in a reasonable way, the grasslands had not been degraded, the soil nutrient content was high, and the vegetation was in a good state. As to the alpine meadow, the higher the grazing pressure, the worse the habitat degradation and the worse the soil degradation, which was reflected in the increase of soil bulk density, the decrease of soil moisture content, and the decrease of soil total phosphorus and organic matter concentration, resulting in the decrease of vegetation coverage. The degree of grassland degradation of different types was positively correlated with soil bulk density, pH and water-soluble salt concentration, and the correlation was up to a significant level. It had highly significant negative correlation with water content, total phosphorus concentration, organic matter concentration and vegetation coverage, with the correlation coefficient up to -0.907. There was a significant positive correlation between soil fertility factor and vegetation state in the process of grassland degradation.