鄂尔多斯草地荒漠化程度定量评价

Quantitative assessment of desertification degree in Ordos Grassland,northern China.

通过对鄂尔多斯草地荒漠化野外调查和分析,研究了植被盖度和生物量与荒漠化程度的相关性及作为中间变量遥感估测荒漠化程度的可行性.研究结果表明:植被盖度和生物量与荒漠化程度密切相关,相关系数分别达到了-0.899和-0.624,线性关系显著,随着植被盖度和生物量的减少,荒漠化程度不断加重;用植被盖度和生物量定量评价土地荒漠化程度获得了较理想的效果,其模型正确预报精度达到了85%,荒漠化程度预报误差不超过1个等级,可较好地满足生产需要.

Via field investigation and its analysis in Ordos grassland,correlations between vegetation coverage,biomass and land desertification degree were studied.The feasibility of using vegetation coverage and biomass as middle variables to evaluate the desertification degree was analyzed.The results show that land desertification degree was closely correlated with vegetation coverage and biomass,with an correlation coefficient of-0.899 and-0.624,respectively.The decreasing vegetation coverage and biomass intensified land desertification.It was rather ideal to assess desertification on the basis of vegetation coverage and biomass: correct prediction proportion of testing samples reached 85% and the prediction error of desertification degree was less than one grade.This method can be applied to the practical project.