基于DPM-SPOT的2000—2015年中亚荒漠化变化分析

干旱区地理 ›› 2018, Vol. 41 ›› Issue (1): 119-126.

基于DPM-SPOT的2000—2015年中亚荒漠化变化分析

陈文倩^1,2, 丁建丽^1,2, 谭娇^1,2, 张钧泳^1,2, 刘博华^1,2

1. 新疆大学资源与环境科学学院智慧城市与环境建模自治区普通高校重点实验室, 新疆乌鲁木齐 830046;
2. 绿洲生态教育部重点实验室, 新疆乌鲁木齐 830046

收稿日期:2017-08-30 修回日期:2017-11-21 出版日期:2018-01-25
通讯作者: 丁建丽.E-mail:watarid@xju.edu.cn
作者简介:陈文倩(1988-),女,博士生,主要从事干旱区资源遥感研究.E-mail:mascotup@126.com
基金资助:
国家自然科学基金（41771470，U1303381）；自治区重点实验室专项基金（2016D03001）；自治区科技支疆项目（201591101）；教育部促进与美大地区科研合作与高层次人才培养项目；新疆大学优秀博士生科技创新项目（XJUBSCX-2016014）

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

CHEN Wen-qian^1,2, DING Jian-li^1,2, TAN Jiao^1,2, ZHANG Jun-yong^1,2, LIU Bo-hua^1,2

1. Xinjiang Common University Key Lab of Smart City and Environmental Stimulation, Xinjiang University, Urumqi 830046;
2. Key Laboratory of Oasis Ecology Ministry of Education, Urumqi 830046, Xinjiang, China

Received:2017-08-30 Revised:2017-11-21 Online:2018-01-25

摘要/Abstract

摘要： 中亚地区与中国西部同属一个完整的内陆地理生态系统，生态环境极其相似，基于丝绸之路经济带的区域间大发展，对中亚地区荒漠化的研究，将更好的服务于我国向中亚开放发展的战略。依据2000—2015年SPOT VEGETATION为数据源，引入像元二分模型法（DPM），得到2000—2015年间中亚地区的植被覆盖度数据，通过计算转换，最终获取4期中亚地区土地荒漠化程度分布图与荒漠化等级数据，并对其进行分析。结果表明：中亚地区荒漠化总体呈“7”字形分布，基本沿东北西南方向对称；中亚地区整体荒漠化情况不容乐观，荒漠化面积比例约占到中亚地区面积的80%；荒漠化有扩张趋势，2000—2010年，约以每年20 km的速度向北部扩张，但从2010—2015年以后增速明显放缓。总体来看，中亚西南部荒漠化程度依然在加剧。研究表明，基于遥感数据对中亚荒漠化问题的研究，可以有效弥补地面数据不足这一劣势，为以后大尺度的遥感制图提供数据支撑。

关键词: 中亚地区, 荒漠化, DPM, SPOT VEGETATION数据

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

中图分类号:

TP79

陈文倩, 丁建丽, 谭娇, 张钧泳, 刘博华. 基于DPM-SPOT的2000—2015年中亚荒漠化变化分析[J]. 干旱区地理, 2018, 41(1): 119-126.

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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