摘要
为了解广西植被覆盖度不同地貌下的时空演变特征及植被覆盖度与地形的关系,促进生态环境建设健康发展,利用2000—2018年MODIS NDVI长时间序列数据,分析广西喀斯特石山区和山地丘陵区植被覆盖度年代际时空演变特征和两地植被覆盖度随海拔、坡度和坡向变化的差异。结果表明,2000—2018年,广西喀斯特石山区和山地丘陵区植被覆盖度改善程度均较大;喀斯特石山区植被覆盖度增长速率为8.36%/10 a,山地丘陵区为7.81%/10 a。两地植被覆盖度随海拔、坡度和坡向的变化特征较一致,且年份差异较小。两地植被覆盖度在较低海拔区均随海拔升高而增加;不同海拔等级植被覆盖度均明显增加,喀斯特石山区增幅更大;喀斯特石山区植被覆盖度最高的海拔为600~1000 m,山地丘陵区为1000~1400 m;两地植被覆盖度在海拔小于200 m时差异最大,600~1000 m时最小。两地植被覆盖度在坡度5°~10°时均随坡度增加而增加;坡度大于10°时,山地丘陵区变化更稳定。山地丘陵区不同等级坡度的植被覆盖度均高于喀斯特石山区;两地植被覆盖度在坡度15°~25°时差异最大,坡度大于25°时差异最小。两地植被覆盖度均在南坡(坡向135°~180°)最高;喀斯特石山区在西坡(坡向270°~315°)最低,山地丘陵区在西坡(坡向225°~270°)最低;两地植被覆盖度在东坡(坡向90°~135°)差异最大,西坡(坡向225°~270°)最小。
In order to understand spatial-temporal evolution characteristics of vegetation coverage in different landforms of Guangxi and relationship between vegetation coverage and topography,and promote healthy development of ecological environment construction,based on MODIS NDVI long-term series data from 2000 to 2018,decadal spatial-temporal evolution characteristics of vegetation coverage in Karst rocky area and mountain hilly area of Guangxi and differences of vegetation coverage changes with altitude,slope and aspect between two regions were analyzed.Results showed that improvement degree of vegetation coverage was greater in Karst rocky area than that in mountain hilly area,withgrowthrateof8.36%/10ainKarstrockyareaand 7.81%/10a in mountain hilly area,respectively.Change characteristics of vegetation coverage with altitude,slope and aspect in two regions were relatively consistent,and differences among years were small.Vegetation coverage in two regions increased with increase of altitude at low altitude.Vegetation coverage at different altitude levels in two regions increased significantly,and increase in Karst rocky area was greater.Altitude with the highest vegetation coverage was 600-1000 m in Karst rocky area and was 1000-1400 m in mountain hilly area.Difference of vegetation coverage between two regions was the largest when altitude was less than 200 m and was the smallest when altitude was 600-1000 m.Vegetation coverage of two regions increased with increase of slope at slope of 5°-10°.When slope was greater than 10°,change of vegetation coverage in mountain hilly area was more stable.Vegetation coverage of mountain hilly area at different slope degrees were higher than those of Karst rocky area.Difference of vegetation coverage between two regions was the largest when slopes was 15°-25°and was the smallest when slope was greater than 25°.Vegetation coverage were the highest on southern slope(135°-180°aspect)in two regions.Vegetation coverage was the lowest on west slope(270°-315°aspect)in Karst ro
作者
黄冬梅
陈燕丽
莫建飞
黄肖寒
毛宜川
覃弼勇
Huang Dongmei;Chen Yanli;Mo Jianfei;Huang Xiaohan;Mao Yichuan;Qin Biyong(Hechi Meteorological Bureau,Hechi,Guangxi 547000,China;Guangxi Institute of Meteorological Sciences,Nanning,Guangxi 530022,China;Guangxi Office of Civil Air Defense and Border and Coastal Defense,Nanning,Guangxi 530029,China)
出处
《广西林业科学》
2022年第5期626-633,共8页
Guangxi Forestry Science
基金
广西科技厅重点研发项目(桂科AB20159022,桂科AB17292051,桂科AB21238010)
广西气象局重点项目(桂气科2019Z04)。
关键词
植被覆盖度
变化特征
地形因子
喀斯特石山区
山地丘陵区
广西
vegetation coverage
change characteristic
topographical factor
Karst rocky area
mountain hilly area
Guangxi
