摘要
文中基于GEE云平台计算的遥感生态指数(RSEI),定量分析了兰州市近40年生态环境质量的时空变化及其驱动力。结果表明:1)兰州市RSEI在0.28~0.46之间波动上升,可以分为三个阶段:1986-1998年、1999-2012年和2013-2021年,各阶段RSEI的年增长率分别为0.25%、0.78%和0.18%,表明近40年来兰州市生态环境质量呈阶段性改善状态。2)空间上,2013-2021年兰州市南部的山地森林带和自然保护地RSEI明显增加,而北部兰州新区与主城区之间的黄土丘陵地带的裸地和草地有所退化,1986-2012年与之相反。3)不同土地利用类型RSEI变化趋势不一致,但耕地RSEI持续变好,表明退耕还林还草工程实施对生态环境改善具有显著的促进作用。4)线性混合效应模型分析表明:人类活动对RSEI变化的贡献率为90%,其中绿化覆盖面积是主要贡献因子。综上,人类活动对近40年来兰州市生态环境质量改善发挥了巨大作用。
Using the Landsat satellite images,we calculated the remote sensing ecological index(RSEI)based on GEE cloud platform,and analyzed the spatial-temporal patterns of eco-environment quality and its driving forces for Lanzhou City during the past 40yr.The results shown that:1)The RSEI increased periodically from 0.28 to 0.46,and can be clearly divided into three periods:1986-1998,1999-2012 and 2013-2021,and annual growth rate for each of periods was 0.25%,0.78%and 0.18%,respectively.2)Spatially,the RSEI in the last 10 years was increased for forest and natural protected areas at the southern,but it was decreased for loess hilly areas at the northern of Lanzhou,which mainly distributed between Lanzhou urban area and new district,while it was reversed in 1986-2013.3)The variation of RSEI for different land use patterns was inconsistent,in which the RSEI of farmland was going well that suggests the project to return farmland to forest and grassland has significant effect on eco-environmental quality improvement.4)Linear mixed-effects model analysis showed that human activity(90%)rather than climate change(10%)was the major reason that induced the increased RSEI for Lanzhou,of which the increase of green coverage area was the main factor.We concluded that eco-environment quality was improved obviously during the past 40 years,of which urban greening construction and the project to return farmland to forest and grassland made great contribution for it.However,the project of land creation and construction of Lanzhou new district made the degeneration of eco-environment quality partly in the short-term.
作者
张燕
梁进一
韦玲霞
ZHANG Yan;LIANG Jinyi;WEI Lingxia(Lanzhou Institute of Land Resources Evaluation,Lanzhou 730000,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2023年第10期65-74,共10页
Journal of Arid Land Resources and Environment
关键词
生态环境质量
遥感生态指数
土地利用类型
GEE
兰州市
eco-environmental quality
remote sensing ecological index
land use patterns
GEE
Lanzhou City
