Abstract: By using remote sensing information model, this paper quantitatively retrieved the main factors for desertification evaluation of Keerqin sandy land, which included vegetation cover, biomass, and soil moisture content. The occupation ratio of bare sandy land was obtained by using linear mixed spectrum model. Every image pixel could be used to acquire the indices of all evaluation factors. Based on the current methods of desertification assessment, the quantitative remote sensing information model on the basis of the pixel was built, and the distribution map of desertification degree was plotted. The precision of the model calculated by selecting 60 in situ sample data reached 91.7%, suggesting that it was reliable and scientific to evaluate the desertification degree by using this model.

Key words: Brachionus rubens, Food, Population growth rate, Body volume, Egg volume