摘要
研究和掌握叶面积指数(LAI)时空变化特征,对区域植被保护、植树造林和环境保护具有重要的参考意义。本文以邯郸市为例,基于MCD15A3H遥感影像数据、DEM数据和土地利用等多元数据,引入Sen趋势与Mann-Kendall趋势检验分析方法,系统分析了邯郸市像素尺度上的LAI数值的变化特征,并基于不同的土地利用类型、不同植被以及不同坡度进行了LAI变化特征分析。研究结果表明:1)从时间尺度上,2003—2019年间,邯郸市叶面积指数呈现显著的增加趋势,从1.62增加到2.33;2)从空间尺度上,邯郸市历年LAI均值呈现西高东低、城区低于郊区的现象;3)从覆被类型上,LAI均值呈现为林地>耕地>草地>裸地>其他的趋势,多年均值分别为5.2、3.4、1.8、0.8、0.4;4)在不同坡度上,15°—25°的地势LAI变化最大。
It is of great significance to study and master the spatial and temporal characteristics of leaf area index(LAI) for regional vegetation protection, afforestation and environmental protection. Based on MCD15 A3 H remote sensing image data, DEM data and land use data this paper systematically analyzes the changes of LAI values on pixel scale of Handan city by introducing Sen trend and Mann-Kendall trend test and analysis method. The LAI change characteristics are analyzed based on different land use types, different vegetation and different slope. The results show that:(1) Regarding to time scale: between 2003 and 2019, the leaf area index of Handan city showed a significant increase trend, from 1.62 to 2.33;(2) Regarding to spatial scale: the LAI mean value of Handan city in the past years was high in the west and low in the east, and the urban area was lower than the suburbs;(3) Regarding to covering type, LAI mean value showed the trend of forest land > cultivated land > grassland >bare land > other trends, the mean values of the years are 5.2, 3.4, 1.8, 0.8 and 0.4;(4) Regarding to different slopes, the change of LAI is the largest from 15° to 25°.
作者
李武乾
张安兵
王贺封
于坤
焦月正
LI Wuqian;ZHANG Anbing;WANG Hefeng;YU Kun;JIAO Yuezheng(School of Mining and Geomatics Engineering,Hebei University of Engineering,Handan 056038,China;Handan Key Laboratory of Natural Resources Spatial Information,Handan 056038,China;Handan Polytechnic College,Handan 056001,China)
出处
《测绘与空间地理信息》
2022年第2期25-28,共4页
Geomatics & Spatial Information Technology
基金
河北省自然科学基金生态智慧矿山联合基金项目(E2020402086)
国家自然基金面上项目(42071246)
河北省高等学校科学技术研究项目重点项目(ZD2018230)资助。
