基于Sentinel-2影像的武夷山国家公园海拔梯度上不同植被类型的水源涵养能力  

Examining water conservation capacity of different vegetation types along an elevation gradient in Wuyishan National Park based on Sentinel-2 images

作　　者：刘艳清 黄石德[2,4] 徐丹丹 濮毅涵 安德帅[1] 王浩斌 LIU Yan-qing;HUANG Shi-de;XU Dan-dan;PU Yi-han;AN De-shuai;WANG Hao-bin(College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China;Institute of Ecosystem and Environment Research,Fujian Academy of Forestry,Fuzhou 350012,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China;National Observation and Research Station of Fujian Wuyishan Forest Ecosystem,Wuyi-shan 354300,Fujian,China)

机构地区：[1]南京林业大学生物与环境学院,南京210037 [2]福建省林业科学研究院生态环境研究所,福州350012 [3]南京林业大学南方现代林业协同创新中心,南京210037 [4]福建武夷山森林生态系统国家定位观测研究站,福建武夷山354300

出　　处：《生态学杂志》2022年第12期2406-2413,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41901361);江苏省自然科学基金项目(BK20180769);江苏省“六大人才高峰”项目(TD-XYDXX-006);江苏省高校自然科学研究面上项目(18KJB180009)资助。

摘　　要：全球水资源问题日趋严重,森林水源涵养功能对可持续发展的作用进一步突出。然而,不同时间尺度上各植被类型水源涵养能力变化的规律仍未完全厘清。本研究以武夷山国家公园沿海拔梯度的不同植被类型(常绿阔叶林、草甸、针叶林和矮林、针阔混交林)为对象,以2017—2020年Sentinel-2影像为数据源,构建水源涵养能力指标模型,将不同植被类型的垂直结构指数与归一化植被指数(NDVI)结合,以其与坡度(Slope)的比值为指标,分析研究区4种植被类型的水源涵养能力,并探讨其季节性变化规律、空间分布特征等。结果表明:基于Sentinel-2影像水源涵养能力指标模型对不同季节各植被水源涵养能力监测具有可行性;4种植被类型不同季节的水源涵养能力强弱均为秋季>夏季>春季>冬季;水源涵养能力的空间分布与垂直带谱上植被分布大体一致,不同季节武夷山国家公园4种植被类型涵养水源能力大小为常绿阔叶林>针阔混交林>针叶林和矮林>草甸。The severe shortages of water resources have become a global issue.Water conservation as a function of forests is becoming more and more important to sustainable development.However,the difference of water conservation capacity among various vegetation types and different seasons is still unclear.In this study,we analyzed the seasonal and spatial variations of water conservation capacity of different vegetation types(i.e.,evergreen broadleaved forest,meadow,coniferous forest and dwarf forest,coniferous and broadleaved mixed forest)along an elevation gradient in Wuyishan National Park.Water conservation capacity was represented by an index calculated by the ratio of normalized difference vegetation index(NDVI;i.e.,calculated from Sentinel-2 images,which obtained from 2017-2020)to mountain slope(i.e.,calculated from the Digital Elevation Model(DEM)).The results showed that this index was feasible to monitor water conservation capacity of different vegetation types in different seasons.The water conservation capacity of all vegetation types in different seasons was autumn>summer>spring>winter.The spatial distribution of water conservation capacity across the elevation gradient was consistent with vegetation distribution.Water conservation capacity of the four vegetation types across different seasons was in order of evergreen broadleaved forest>coniferous and broadleaved mixed forest>coniferous forest and dwarf forest>meadow.

关 键 词：水源涵养能力指标模型 归一化植被指数 坡度 季节变化 海拔梯度 

分 类 号：Q948[生物学—植物学]