摘要
基于2001、2007、2013和2017年的ETM/OLI遥感影像,使用复合植被指数构建的植被覆盖度模型与目视解译相结合提取塔里木盆地北缘绿洲-荒漠过渡带,并对其时空演变过程进行分析,为推动干旱区绿洲经济的可持续发展,土地荒漠化防治以及区域生态环境改善提供依据。结果表明:(1)2001—2017年间研究区绿洲面积呈扩增趋势,荒漠面积呈下降趋势;过渡带面积先减少后趋于稳定,年均扩增速率为-0.264%。(2)近16年来绿洲面积沿其边缘向外有不同程度的扩增,过渡带扩张面积主要由荒漠变化而来,缩小面积主要变化为绿洲,未变化面积趋于稳定,年均变化面积为-0.058×10^4 hm^2;(3)研究时段内受人为因素影响,绿洲面积迅速扩张,过渡带内侧的荒漠植被被开垦为耕地;位于区域东部和南部的地带,由于受地形和水文等自然因素的影响,过渡带面积扩增,荒漠面积缩减。近16年来塔里木盆地北缘加快了绿洲化进程,较为有效的控制了荒漠化;但过渡带空间变动较大,绿洲扩张过快且普遍存在环境恶化现象,该区域的生态环境还需进一步改善。
The vegetation coverage model constructed via VBSI was combined with visual interpretation to extract oasis-desert transition zone in the northern margin of Tarim Basin,and then its space-time evolution was analyzed based on ETM/OLI remote-sensing image in 2001,2007,2013 and 2017,which could provide a basis for promoting sustainable development of oasis economy,controlling land desertification and improving regional ecological environment in the arid region.The results indicated that(1)the oasis area was expanding,while the desert area was declining in the research region from 2001 to 2017;the area of transition zone was firstly decreased and then tended to be stable with the annual average expanding rate of-0.264%.(2)The oasis area has been expanding along the edge to some extent in the recent 16 years,and the area of transition zone is mainly evolved from deserts,but the unvaried area tends to be stable with the annual average variation area of -0.058×10^4 hm^2.(3)The oasis area is expanding rapidly and the desert vegetation inside the transition zone is converted for plowland due to human factors in the research period;the area of transition zone is increasing,while that of desert is reducing in the east and south regions due to natural factors,such as topography and hydrology etc.The oasisization process at the north margin of Tarim Basin has been accelerated in the recent 16 years,which has controlled the desertification effectively.However,the environmental deterioration is commonly existed with large variation of transition zone and fast expansion of oasis.Thus,the ecological environment in this region shall be further improved.
作者
边慧芹
王雪梅
BIAN Huiqin;WANG Xuemei(College of Geography Science and Tourism,Xinjiang Normal University,Urumqi,830054 China;Xinjiang Uygur Autonomous Region key laboratory“Xinjiang Laboratory of Lake Environment and Resources in Arid Zone”,Urumqi 830054,China)
出处
《生态科学》
CSCD
2020年第3期80-87,共8页
Ecological Science
基金
国家自然科学基金“塔里木盆地北缘绿洲-荒漠过渡带植被对土壤盐渍化的响应研究”(编号:41561051)
自治区研究生科研创新项目“基于改进植被指数的渭-库绿洲植被覆盖度反演及时空演变分析”(编号:XJ2019G228)。
关键词
植被覆盖度模型
叠加分析
绿洲-荒漠过渡带
塔里木盆地北缘
vegetation coverage model
overlay analysis
oasis-desert transitional zone
northern margin of Tarim Basin
