基于MODIS时间序列数据分析的黄河流域植被生长状态评价

EVALUATING VEGETATION GROWTH CONDITION IN YELLOW RIVER BASIN USING TIME-SERIES MODIS DATA

分析流域归一化植被指数INDV随时间变化的规律,提出了植被生长量评价方法,并基于植被生长量、植被生长状态和年际植被变化趋势等方法分别对2000、2002、2004、2007年流域不同时空分布的植被进行了评价,得出以下结论:1)上游、下游及分布在中游水源边的植被生长量较大,而且植被生长量较低的黄土高原经历先增加然后减少的变化趋势;2)生长状态较差的地区主要集中在兰州、宁夏、内蒙地区,但是2000年后这些区域的植被生长状态趋向好转;3)黄土高原地区在2000、2002、2004、2007年之间有转好的趋势,而上游、下游及中游南部的植被覆盖有降低的趋势.

A new growth evaluation method is presented according to the rule of INDV change with time,and spatial growth change evaluation is implemented in various time scales.It was found that： 1） High growth areas are mainly distributed in up course,middle course and farm field and vegetation near water source of low course.The vegetation growth begins to increase from year 2000,then decrease.2） Bad growth condition was mainly distributed in Lanzhou city,Ningxia and inner Mongolica,but these vegetation conditions become better than in 2000.3） Vegetation in Loess Plateau has an increasing trend from 2000,but the vegetation in up course,low course and south part of middle course has a decreasing trend.