基于DPM-SPOT的2000—2015年中亚荒漠化变化分析

Abstract

Abstract: In recent years,China's economy and trade relations with Central Asia have become much closer.The analysis of the overall pattern of land desertification and the change of desertification area in Central Asia is of great importance as western China and Central Asia share the same inland geographic ecosystem and it will also provide help to China's Open Strategy to Central Asia.Based on SPOT VEGETATION data from 2000 to 2015,the fractional vegetation coverage data in Central Asia was calculated in this study using the dimidiate pixel model (DPM) and the results were further mapped into the degree profile of land desertification and desertification classification which were illustrated in four phases by every five years from 2000 to 2015.The study showed that the distribution of desertification in Central Asia appeared overall in a shape as digit "7",which meant an obvious strip-shape distribution of desertification existed from the north to the south and it got worse along the direction,and an apparent strip-shape distribution of desertification also existed from the west to the east while the degree of desertification got worn off.The southwest part of this region had the serious desertification.The area of desertification in Central Asia had been expanding,mainly towards the north at a rate about 20 km every year.During the period from 2000 to 2015,the Central Asia desertification area kept increasing from 3 807 298 km² in 2000 to 4 076 818 km² in 2015 with a growth rate of 7.08%.The growth was mainly divided into two stages:the first stage was the increase of the severe desertification areas from 2000 to 2010.The second stage was mainly the increase of the mild and moderate desertification areas from 2010 to 2015.In general,in the southwest of Central Asia,the desertification has been aggravating.The study demonstrated it can effectively retrieve the regional fractional vegetation coverage by usingNDVI as the most suitable characterization of vegetation index combined with DPM as the vegetation and soil type is relatively simple in the region which actually made up the ground data deficiency.The study on the desertification in Central Asia based on the remotely sensed data can provide data support for cartography in large scale and the development decision in Silk Road Economic Belt.

Key words: Central Asia, desertification, DPM, SPOT VEGETATION data

CLC Number:

TP79

CHEN Wen-qian, DING Jian-li, TAN Jiao, ZHANG Jun-yong, LIU Bo-hua. Desertification change in Central Asia based on DPM-SPOT from 2000 to 2015[J].干旱区地理, 2018, 41(1): 119-126.

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Desertification change in Central Asia based on DPM-SPOT from 2000 to 2015

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