生态学报2018，Vol.38Issue(7)：2414-2424,11.DOI:10.5846/stxb201703290550
基于TM NDVI的武功山山地草甸植被覆盖度时空变化研究
Spatial-temporal dynamics of upland meadow coverage on Wugong Mountain based on TM NDVI
摘要
Abstract
Taking the upland meadow on Wugong Mountain as a study area,and based on the TM (Thematic Mapper)remote sensing image,this study used ENVI 5.1 and ArcGIS 10.0 software to calculate the vegetation coverage distribution pattern and to analyze the dynamic changes to upland meadow on Wugong Mountain.The results indicated that the area showed a progressively decreasing trend that fell by 9.72％ during the study period.During the past 20 years,with the establishment of the Wugong Mountain Scenic Area and the development of tourism,the ecological restoration of upland meadow has meant that vegetation coverage has increased;the vegetation coverage distribution characteristics showed that vegetation was high in the southeast and low in the northwest.The low vegetation coverage meadow area was concentrated on a precipice on the northwest slope and on part of the ridge line,whereas meadow coverage was high on the southeast slope.The degradation and improvement of upland meadow coexisted in the study area.It was degraded in the northernmost end of the upland meadow and the low altitude area of the southeast and south slopes of Bai Hefeng-Jiu Longshan area;the vegetation showed improvement on the southern slope of Fa Yunjie.At the same time,the distribution pattern of vegetation coverage and terrain factors were closely related (P＜O.05):vegetation coverage showed regular change with the change in aspect.Its distribution was in the order:sunny slope ＞ fiat area ＞ shady slope.Vegetation coverage rose firstly with the rise of slope and peaked at 15°-25°,but then fell along with the rise of the slope.It reached its lowest value at 45°-90°.Vegetation coverage showed a wavelike decline with increasing altitude,and achieved a maximum value at an altitude of 1000-1200m,and a minimum value at the peak region of 1800-1918.3m.This research showed that the methods employed were feasible and accurate and could be used to investigate large area distributions and variations in mountain meadow coverage.However in order to analyze the evolution and trends on upland meadow more accurately and reliably,the image data for different season should be used in a follow-up study that includes the long-term monitoring of vegetation coverage in the study area.关键词
山地草甸/植被覆盖度/时空变化/NDVI/像元二分模型/武功山Key words
upland meadow/vegetation coverage/spatiotemporal variation/NDVI/dimidiate pixel model/Wugong Mountain引用本文复制引用
张学玲,张莹,牛德奎,张文元,李志,李真真,郭晓敏..基于TM NDVI的武功山山地草甸植被覆盖度时空变化研究[J].生态学报,2018,38(7):2414-2424,11.基金项目
国家自然科学基金项目(31560150,31360177) （31560150,31360177）
江西省科技计划项目(20144BBF60002) （20144BBF60002）
