摘要
深入理解大熊猫栖息地植被变化过程及其驱动力,是开展大熊猫栖息地保护和管理的重要基础。该研究利用1986–2018年所有可用的Landsat TM/ETM/OLI影像构建长时间序列归一化植被指数(NDVI),采用BFAST(Breaks For Additive Seasonal and Trend)方法实现大熊猫栖息地植被变化历史检测,从植被累积突变、累积渐变和总变化3个指标揭示植被变化空间分布特征;运用地理探测模型定量评价不同因子(年降水量、年平均气温、高程、坡度、坡向、与河流距离、土壤类型、土地覆盖类型、与道路的距离、与工程扰动区距离)对3种植被变化空间分布的影响。结果表明:1)研究区内植被突变面积比例为9.13%,主要分布于栖息地东部边界附近,2011和2013年植被突变面积较大;2)植被累积突变表现为退化面积占植被累积突变面积的40.17%,植被累积渐变和总变化表明研究区植被呈现改善趋势,改善面积比例分别占研究区的94.58%和97.02%;3)3种植被变化的空间分布主要受年降水量、年平均气温、高程、土壤类型4种因子的影响,植被累积突变、累积渐变和总变化空间分布的最强解释因子分别为年降水量、高程和土壤类型,驱动因子之间的交互作用为相互增强、非线性增强关系。
Aims Understanding the processes and drivers of vegetation change in giant panda habitats plays an important role in their conservation and management.Methods Based on the long-term normalized difference vegetation index(NDVI)time series that was constructed by all available Landsat TM/ETM/OLI images from 1986 to 2018,we employed the BFAST(Breaks For Additive Seasonal and Trend)method and harmonic model to monitor the vegetation change during the period of 1986–2018.Three types of NDVI changes(i.e.vegetation accumulated abrupt change,accumulated gradual change,and total change)were built to reveal the spatial distribution characteristics of vegetation change.The effects of different factors(i.e.mean annual precipitation,mean annual air temperature,elevation,slope,aspect,distance to rivers,soil type,land cover type,distance to roads and distance to engineering disturbance area)on the spatial distribution of the three types of vegetation change were evaluated by Geodetector.Important findings 1)A total of 9.13%of vegetation abrupt change in the study area was detected,which was mainly distributed around the eastern boundary of the habitats,and the largest abrupt change areas occurred in 2011 and 2013.2)The proportion of vegetation accumulated abrupt change showing degradation accounted for 40.17%of the vegetation accumulated abrupt change area,and the accumulated gradual change and total change which presented increasing trends accounted for 94.58%and 97.02%of the study area,respectively.3)The spatial distribution of vegetation changes was mainly affected by four factors:mean annual precipitation,mean annual air temperature,elevation,and soil type.The strongest explanatory factors of vegetation accumulated abrupt change,accumulated gradual change,and total change were mean annual precipitation,elevation,and soil type,respectively.The interactions between driving factors were mutually enhanced and nonlinearly enhanced.
作者
周明星
李登秋
邹建军
ZHOU Ming-Xing;LI Deng-Qiu;ZOU Jian-Jun(School of Environmental and Resource Sciences,Zhejiang A&F University,Key Laboratory of Carbon Cycling in Forest Ecosystem and Carbon Sequestration of Zhejiang Province,Lin'an,Zhejiang 311300,China;State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2021年第4期355-369,共15页
Chinese Journal of Plant Ecology
基金
国家重点研发计划(2016YFC0503302)
国家自然科学基金(41701490)。
