Abstract:

According to the multiple point samples and the laboratory analysis of the degraded grassland in Naqu district, the soil nutrient characteristics of the grasslands of different degradation levels and the correlation of the nutrients are both researched with the application of the statistical methods for the standardization of the soil nutrient data. It was researched out that: (1) with the increase of the grassland degradation, soil available N (AN), available P (AP), total N (TN) and soil organic matter (OM) decreased along with the degradation degree, while the content of soil available K (AK) showed an increasing and then decreasing trend. (2) Under different degradation, the content of soil AN and TN had significant correlation with soil OM, respectively. (3) The content of soil AN, TN and OM could be considered as the important indicators in measuring degradation levels of the grassland in North Tibet plateau, while AP, the referential indicators in assessing, and AK, not suitable to be an indicator. At last, some suggestions on recovering and rebuilding the ecosystem of the grassland in North Tibet plateau are proposed.