典型草原退化评价因子及其分级标准的研究

Study on degradation evaluation factors of typical steppe and its classification standard

草原是生态安全的天然绿色屏障,然而过去几十年我国草原出现大面积的退化、沙化、盐渍化。通过遥感监测草原是一种便捷的手段,基于遥感通过多指标综合评价草原退化状况也是一种相对准确的方法,但多数研究人员在选择遥感综合评价因子时并没有考虑土壤的因素,另一个比较突出的问题是当前草原退化分级的国家标准在实际应用中难以统一标准,这都会影响到最终的草原退化评价结果。本文通过对西乌珠穆沁典型草原实地踏查数据的相关性分析,筛选适合综合评价草原退化状况的评价因子,并通过对实地踏查数据的统计与分析,进一步探索典型草原各评价指标的退化等级分级标准。

Grassland is the natural green barrier of the ecological security,but widespread degradation,desertification and salinization of grassland have appeared in our country during the past few decades.Remote sensing is used to monitoring the grassland as a convenient means,and multi-index comprehensive evaluation based on remote sensing is an accurate method to evaluate the grassland degradation.The factors of soil had not been considered by most researchers when choosing the evaluation factors,the current grassland degradation classification national standard is difficult to be uniformed during the actual application and all the problems above affect the final evaluation results.Based on the correlation analysis of field data in Ujimqin typical steppe,the evaluation factors for evaluating the degradation of grassland was filtrated,and the classification standard of the evaluation factors in typical steppe was explored through the statistics and analysis of field data.