【摘要】 在对那曲地区退化草地进行多个点采样和室内分析的基础上,应用统计学方法对土壤养分数据进行标准化处理后,研究了那曲地区不同退化程度草地土壤的养分特征及养分之间的相关性。结果表明:(1)随着退化程度的增加,那曲地区草地土壤的有效氮、有效磷、全氮、有机质含量逐渐降低,有效钾含量先升后降。(2)在那曲地区不同退化程度的草地土壤中,有效氮、全氮与有机质间均存在显著的相关关系。(3)土壤全氮、有效氮和有机质含量可作为衡量藏北高原草地退化程度的重要指标。有效磷可作为评价草地退化程度的参考指标。有效钾不宜作为草地退化程度评价的指标。最后,对藏北高原草地生态系统的恢复重建提出了建议。更多还原

【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.更多还原