Analysis on the Temporal and Spatial Variation and Diversification Factors of Vegetation Coverage in Guangxi Zhuang Autonomous Region
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摘要: 旨在利用MODIS遥感数据集对研究区19年植被覆盖度的时空变化及多元化因子进行分析,研究表明:(1)广西近19年植被覆盖度整体较高,空间分布呈四周高、中间低的特征;(2)2001-2019年FVC呈上升趋势,且上升趋势的面积占比达到61.50%,上升速率为每10年0.091,且波动变化相对稳定;(3)由气温、降水量与FVC偏相关性结果可知,植被覆盖度与气候因子之间存在相关性,气温以每10年0.38℃的上升速率呈上升趋势,降水量呈缓慢下降趋势,降水量及气温对植被覆盖度的影响存在空间异质性;随着海拔的升高植被覆盖度呈先增后减的趋势;坡向对植被类型的布局影响较大,阳坡主要以林地类型为主,阴坡主要以草地和林地为主;不同坡度植被覆盖变化显著,在坡度≤15°时植被覆盖度较高,当坡度越大时植被覆盖度呈下降状态;(4)随着土地利用类型的变化植被覆盖度有明显差异,转为林地和草地的面积及植被覆盖度都呈逐年增加趋势,耕地植被覆盖度呈先增后降的趋势。Abstract: This paper aimed to use the MODIS remote sensing data set to analyze the temporal and spatial variation and diversification factors of vegetation coverage in the study area in the past 19 years. The research showed that: (1) In the recent 19 years, the vegetation coverage in Guangxi was higher on the whole, and the spatial distribution was characterized by higher in the periphery and lower in the middle. (2) From 2001 to 2019, FVC showed an increasing tendency, and the area of the increasing tendency accounted for 61.50%. The raising rate was 0.091 per 10 years, and the fluctuation was relatively stable. (3) According to the partial correlation results of temperature, precipitation and FVC, there was a correlation between vegetation coverage and climatic factors. The temperature increased at a rate of 0.38℃ every 10 years, and the precipitation decreased slowly. The influence of precipitation and temperature on the vegetation coverage had spatial heterogeneity. With the increase of altitude, the vegetation coverage increased first and then decreased. The slope aspect had a great influence on the layout of vegetation types. The sunny slope was mainly dominated by forest land types, while the shady slope was mainly dominated by grassland and forest land types.The vegetation coverage changed significantly at different slopes. When the slope was less than 15°, the vegetation coverage was higher, and when the slope was larger, the vegetation coverage decreased. (4) With the change of land use types, there was significant difference in the vegetation coverage. The area converted to forestland and grassland and the vegetation coverage increased year by year, while the vegetation coverage of cultivated land increased first and then decreased.
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