武夷山国家自然保护区NDVI对坡度的响应  

NDVI Response to Topographic Slope in Wuyishan National Nature Reserve

作　　者：张玉琴 李丽纯 彭继达[1,2] 廖廓 刘桐恺[1,3] ZHANG Yuqin;LI Lichun;PENG Jida;LIAO Kuo;LIU Tongkai(Fujian Key Laboratory of Severe Weather,Fuzhou 350001,China;Meteorological Sciences Institute of Fujian Province,Fuzhou 350001,China;Meteorological Observatory of Fujian Province,Fuzhou 350001,China)

机构地区：[1]福建省灾害天气重点实验室,福建福州350001 [2]福建省气象科学研究所,福建福州350001 [3]福建省气象台,福建福州350001

出　　处：《生态环境学报》2020年第7期1310-1317,共8页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(41461164007);福建省气象局开放式基金项目(2020K04);福建省气象局卫星遥感监测气象灾害与生态环境创新团队。

摘　　要：武夷山国家自然保护区是全球同纬度带保存最为完整、面积最大的典型中亚热带原生性森林生态系统,地势起伏剧烈,研究此区域归一化植被指数(NDVI)对坡度的响应可为保护区生态建设提供科学参考。文章基于Landsat ETM+/OLI遥感数据、DEM数据和气象资料,提取2004—2018年武夷山国家自然保护区NDVI和坡度,分析研究了2004—2018年保护区6种坡度类型下植被覆盖的变化特征,以及不同坡度下植被的改善和退化情况,指出影响不同坡度NDVI的主要气象因子。结果表明:(1)2004年以来武夷山国家自然保护区植被呈改善趋势,生态环境保护工作取得良好成效,但保护区仍存有耕地、居民点和生产经营活动,中部和北部低坡度地区植被呈变差趋势;(2)在所有坡度范围内,保护区植被变化类型均以轻微改善为主(面积比超过50%),在0°—25°范围内利于植被退化,而在>35°范围内利于植被改善;(3)NDVI变化趋势与坡度呈二次函数关系,以17°为界,当坡度小于17°时,植被改善随着坡度的增加而缓慢减弱;当坡度大于17°时,植被改善随着坡度的增加而增强;(4)在保护区内,影响植被生长的主要气象因子为降水。研究结果可为保护区制定生态保护规划、实施针对性地保护和应对气候变化影响提供决策依据。Wuyishan National Nature Reserve is the most complete and largest typical mid-subtropical native forest ecosystem within the same latitude zone in the world.The variability of the topography is quite large in this area.Therefore,it is essential to study the response of the normalized difference vegetation index(NDVI)to its topographic slope and will further provide a scientific suggestion for the Reserve ecological construction.Here,NDVI from 2004 to 2018 and slope of Wuyishan National Nature Reserve were retrieved from Landsat ETM+/OLI remote sensing data,DEM data and meteorological data.Further,this paper analyzes the changes of vegetation cover under six topographic slope types in the Reserve during the period of 2004 and 2018,as well as the improvement and degradation of vegetation under different slopes.The results indicate that:(1)The vegetation coverage in Wuyishan National Nature Reserve has been improved since 2004,and the ecological environmental protection work has achieved good results.However,there are still cultivated land,residential areas,and production and operation activities in the Reserve,and the vegetation in central and northern low-slope areas has deteriorated.(2)Within the whole range of slope,all types of vegetation coverage in the Reserve are slightly improved,with the area ratio being more than 50%.The slope of 0°‒25°is beneficial to vegetation degradation while the slope of>35°is better to vegetation improvement.(3)There is a quadratic function relationship between NDVI trend and the slope.This relationship is taking 17°as the threshold,when the slope is less than 17°,the NDVI improvement will gradually weaken with the increase of the slope.In turn,if the slope is greater than 17°,this improvement will be enhanced.And(4)the main meteorological factor affecting vegetation growth is precipitation in the Reserve.This study shed insights into formulating ecological protection planning,implementing targeted protection and responding to the impact of climate change in Wuyishan Nation

关 键 词：武夷山国家自然保护区 坡度 NDVI 降水 

分 类 号：Q948[生物学—植物学] X17[环境科学与工程—环境科学]