近32年黄河流域植被覆盖时空演化遥感监测

发布时间：2018-06-16 06:47

本文选题：植被覆盖 + 归一化植被指数　；参考：《农业机械学报》2017年02期

【摘要】：植被覆盖动态变化及其空间格局演化研究是了解土地资源和环境变化的重要方式,对科学合理地改善生态环境具有重要意义。基于1982—2013年GIMMS-NDVI时序数据,运用均值法、变异系数法、趋势分析法、Hurst指数法,分析了黄河流域植被覆盖时空格局和演化趋势。结果表明:在时间上,黄河流域32 a来NDVI月平均波峰值主要出现在5—9月份,其中以8月份的0.546居首。在年际变化方面,黄河流域植被覆盖呈现较为缓慢的增长趋势,增速为0.018/(10 a);在植被覆盖变异方面,黄河流域在1982—2013年间NDVI变化总体处于低态势的波动过程,其中变异系数小于0.1的低波动变化的区域占流域总面积的53.88%;在空间分布上,黄河流域NDVI多年均值小于0.4的低植被覆盖区域约占流域总面积的24.65%,大于0.6的植被覆盖较好的区域约占流域总面积的45.73%,植被分布从北至南呈阶梯状逐渐增强的变化态势;在变化趋势上,32 a间黄河流域植被覆盖整体在不断改善,约59.49%的地区植被覆盖得到了改善,约33.96%的区域植被覆盖基本没有发生变化;在变化可持续性方面,黄河流域未来植被覆盖变化类型主要是基本不变和持续改善2类,分别占流域总面积的33.56%和58.81%。
[Abstract]:The study on the dynamic change of vegetation cover and the evolution of its spatial pattern is an important way to understand the changes of land resources and environment, and it is of great significance to improve the ecological environment scientifically and reasonably. Based on the time series data of GIMMS-NDVI from 1982 to 2013, the temporal and spatial patterns and evolution trends of vegetation cover in the Yellow River basin were analyzed by means of mean method, variation coefficient method and Hurst index method. The results show that the monthly average wave peaks of the Yellow River basin in the past 32 years mainly occurred in May to September, with 0.546 in August. In terms of interannual variation, vegetation cover in the Yellow River basin shows a slow increasing trend, with a growth rate of 0.018% / 10 a ~ (-1), and the NDVI variation in the Yellow River basin during 1982-2013 is in the process of fluctuating in a low trend. The area with low fluctuation coefficient less than 0.1 accounted for 53.88% of the total area of the basin. In the Yellow River Basin, the low vegetation cover area whose NDVI value is less than 0.4 years accounts for 24.65% of the basin total area, and the area with better vegetation cover area more than 0.6 accounts for about 45.7310% of the basin total area, and the vegetation distribution gradually increases from north to south. In the change trend, the vegetation cover of the Yellow River basin as a whole has been continuously improved in 32 years, about 59.49% of the area vegetation cover has been improved, about 33.96% of the regional vegetation cover has basically not changed, and in terms of the sustainability of the change, The main types of vegetation cover change in the Yellow River basin in the future are basically unchanged and continuous improvement, accounting for 33.56% and 58.81% of the total area of the basin, respectively.
【作者单位】：商丘师范学院环境与规划学院;西北大学城市与环境学院;
【基金】：国家自然科学基金项目(U1304404) 2014年河南省哲学社会科学规划项目(2014CJJ087) 2015年度河南省教育厅人文社会科学重点项目(2015-ZD-085) 2017年度河南省高等学校重点科研项目(17A170003)
【分类号】：TP79;Q948

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