Rapid monitoring method of large-scale land desertification

Abstract

The invention discloses a rapid monitoring method of large-scale land desertification and aims to develop a rapider and more accurate large-scale desertification monitoring method based on easily available data. The method comprises steps as follows: a research time domain is selected, and the period is divided; a research zone is selected, and changes in a town, a water area, a forest and a farmland in six periods are obtained by use of LUCC data; the average value of NDVI data of recent three years is defined as NDVI data of each period; grassland information and native desert information are acquired through NDVI with a decision tree classification method; a non-desertification region and a native desert region are removed from the research area, so that the desertification region is obtained; 15-degree correction of a slope is performed through auxiliary DEM data. According to the method, easily obtained data are adopted, heavy workload of manual interpretation is avoided, a scientific basis is provided for treatment of desertified land, and the method has great practical significance in guiding desertification control and desertification decision.

Description

technical field [0001] The invention relates to the technical field of ecological protection, in particular to a rapid monitoring method for large-scale land desertification. Background technique [0002] Inner Mongolia, Xinjiang and other parts of our country are deeply troubled by desertification. The impact of desertification on our country mainly includes the following aspects: First, it endangers the development of agriculture. The harm of desertification to agriculture is mainly reflected in the sandy soil, and the seedlings are killed by drought or buried by wind and sand. At the same time, the income of farmers cannot be guaranteed; the second is the harm to the grassland, the degradation of the grassland caused by desertification, the dominant grass species suitable for livestock consumption are gradually reduced, or even completely lost, and the livestock carrying capacity of the pasture is greatly reduced; the third is the harm to water resources, desertification ...

AI Technical Summary

Problems solved by technology

[0005] Looking at the above dynamic desertification monitoring methods, most of them focus on the regional scale. Although the results are relatively accurate, if they are applied to the large-scale monitoring process, they often need to visually interpret a large number of images, and the subsequent data processing process is also complicated and time-consuming. and exhausting

Images