运城市盐湖区31年植被与水体指标变化及驱动力分析  

On the change of vegetation and water indicators and driving forces in Yanhu district of Yuncheng city in the past 31 years

作　　者：刘畅 马超[1,2] LIU Chang;MA Chao(School of Surveying and land Information Engineering,Henan Polytechnic University,,Jiaozuo454000,Henan,China;Key Laboratory of Spatio-temporal Information and Ecological Restoration of Mines(Ministry of Natural Resources),Henan Polytechnic University,Jiaozuo454000,Henan,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000 [2]河南理工大学自然资源部矿山时空信息与生态修复重点实验室,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2021年第5期80-89,180,共11页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金委员会与神华集团有限责任公司联合资助项目(重点项目)(U1261206);河南理工大学创新型科研团队项目(T2018-4);河南理工大学博士基金资助项目(B2009-46)。

摘　　要：为研究运城市盐湖区时间序列陆地植被生物量变化以及盐湖面积变化趋势,基于Land-satTM/ETM+/OLI数据(1987—2017年)、盐湖区周边气象站点(1987—2015年)年均气温和降水量数据,对区内归一化差值植被指数(NDVI)和归一化差值水体指数(NDWI)进行定量化及趋势分析、变异分析和相关性分析。结果表明:31年来研究区总NDVI值具有明显增长趋势,线性拟合增长速率slope=20.509,植被覆盖持续改善;2002—2017年盐湖面积均呈逐年下降趋势,总面积减少了16.1%;大气降水对盐湖面积起着决定性作用,1987—2014年盐湖面积与降水量显著相关(r=0.7464,P<0.01),与气温不相关;全区陆表NDVI值(1987—2017年)稳中有升,集中呈现中低波动变化,即0.2<C_(v)≤0.6,占研究区面积的80.68%;盐湖水域内NDVI值和NDWI值多呈高波动变化(C_(v)>0.8),分别占水域的49.73%和45.19%。与盐湖区农业种植活动密切关联的NDVI指标和与盐化工生产活动密切关联的NDWI指标,呈向好趋势。Inorder to study the change trend of land vegetation biomass and area of Yanhu lake in time series of Yanhu district in Yuncheng city, based on the Landsat TM/ETM+/OLI data(1987-2017)and the average annual temperature and precipitation data of meteorological stations around the Yanhu district of Yuncheng city(1987-2015),the normalized difference vegetation index(NDVI)and normalized difference water body index(NDWI)in the area were quantified and conducted variance analysis and correlation analysis.The results showed that in the past 31 years, the total NDVI value in the study area had a significant growth trend, linear fit growth rate slope=20.509,and the vegetation coverage has been improved continuously.From 2002 to 2017,the area of Yanhu lake decreased year by year, and the total area decreased by 16.1%.The atmospheric precipitation played a decisive role in the Yanhu district.The area of Yanhu lake was significantly correlated with precipitation(r=0.7464,P<0.01)from 1987 to 2014,but not with temperature.The NDVI(1987-2017)of the land surface in the whole region increased stable, with a concentration of medium and low fluctuation, that was, 0.2<C_(v)≤0.6,accounting for 80.68% of the study area;The NDVI and NDWI values in Yanhu lake showed high fluctuation(C_(v)>0.8),accounting for 49.73% and 45.19% respectively.The NDVI index, which was closely related to agricultural planting activities in the Yanhu district, and the NDWI index, which was closely related to salt chemical production activities, were showing a positive trend.

关 键 词：运城市盐湖区 归一化差值水体指数 归一化差值植被指数 变异系数 气候变化 

分 类 号：TP753[自动化与计算机技术—检测技术与自动化装置]