九江市植被覆盖时空动态变化及驱动力因子分析

发布时间：2018-03-11 11:03

本文选题：植被覆盖度　切入点：像元二分模型　出处：《四川师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：植被与人类生存和发展休戚相关,严重影响人类的可持续发展。对植被覆盖度的监测是人类长期面临的焦点问题。而植被的生长发育与外界环境因素密切相关,所以通过选取不同影响因子对植被的时空格局进行分析,挖掘植被变化的潜在因素能更加有效保持生态坏境的稳定性。本文通过2000年、2005年、2010年、2015年四期Landsat遥感影像,应用像元二分模型提取九江市的植被分布,并对其进行分类,通过标准差分析法,转移矩阵法,差值法分析植被在时空中的演变。并结合气候与地形因子综合考虑植被在时空上的演变规律。研究得出以下结果:(1)2000年研究区域的植被覆盖度在总体角度上以中高植被覆盖度为主,占总植被覆盖的74%;2005年九江市植被以高植被覆盖度为主,大于60%覆盖度的超过总体面积的2/3;2010年与2015年和2005年分布趋势类似。(2)研究区域植被的稳定性在整体角度上以较强和中稳定性为主,整体上研究区域的植被的稳定性较强,植被的波动变化幅度不大。2000-2015年时间段内,低植被覆盖面积减少1104平方公里,中植被覆盖面积减少1302平方公里;高植被覆盖面积增加3467平方公里;全植被覆盖面积增加7340平方公里。(3)通过与平均温度,温差与降水气候因子分析,研究区域植被与降水的相关系数-0.27呈弱的负相关关系;九江市的植被与温度之间的相关系数为0.24,呈低度的线性相关性;基于像元对植被与温差的相关系数统计得出相关系数是0.11,呈低度线性正相关。(4)植被与地形因子的关系主要表现在,低海拔植被平均密度低,波动性强;坡度较低区域的植被稳定性差,密度低;在南坡,东南坡,东坡分布的植被密度更大。
[Abstract]:Vegetation is closely related to the survival and development of human beings, which seriously affects the sustainable development of human beings. The monitoring of vegetation coverage is the focus of human being for a long time, and the growth and development of vegetation is closely related to external environmental factors. Therefore, by selecting different influencing factors to analyze the spatial and temporal patterns of vegetation, the potential factors of vegetation change can be excavated more effectively to maintain the stability of ecological environment. In this paper, through 2000, 2005, 2010, 2010 four issues of Landsat remote sensing images, Using the pixel dichotomy model to extract the vegetation distribution of Jiujiang city, and classify it, through standard deviation analysis, transfer matrix method, The difference method is used to analyze the evolution of vegetation in time and space. The evolution law of vegetation in time and space is considered in combination with climate and terrain factors. The following results are obtained: 1) in 2000, the vegetation coverage in the study area was generally moderate and high. Vegetation coverage is dominant, In 2005, the vegetation in Jiujiang City was dominated by high vegetation coverage. The distribution trend of vegetation in 2010, 2015 and 2005 was similar. The stability of vegetation in the study area was mainly strong and medium stable in the whole angle, and the stability of vegetation in the whole study area was stronger, and the stability of vegetation in the whole study area was stronger than that in the whole area, and the distribution trend of vegetation in the study area was similar to that in 2015 and 2005. In the period 2000-2015, the low vegetation cover area decreased by 1,104 square kilometers, the middle vegetation cover area decreased by 1302 square kilometers, the high vegetation cover area increased by 3,467 square kilometers; The correlation coefficient -0.27 between regional vegetation and precipitation was negatively correlated with mean temperature, temperature difference and precipitation climate factors. The correlation coefficient between vegetation and temperature in Jiujiang City was 0.24, showing a low linear correlation. Based on the statistics of correlation coefficient between vegetation and temperature difference of pixel, the correlation coefficient is 0.11, showing low linear positive correlation. The relationship between vegetation and topographic factors is as follows: the average density of vegetation at low altitude is low, and the fluctuation is strong; The vegetation density is lower in the lower slope, and higher in the south slope, southeast slope and east slope.
【学位授予单位】：四川师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q948

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