Dynamic evolution of natural wetlands in Yellow River Delta and related driving factors
Dynamic evolution of natural wetlands in Yellow River Delta and related driving factors
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作者：
Guangyu Bo
基于1989年、2000年和2009年黄河三角洲Landsat TM/ETM+遥感影像，结合GIS方法和实地验证，分析了黄河三角洲天然湿地的动态演变及其驱动因素。在水、盐的作用下，天然湿地的空间分布呈现规律性的变化格局。自然湿地面积的年变化梯度和动态性在1989-2000年分别为-0.3和3.1，在2000-2009年分别为-1.8和5.1，表明自然湿地面积在2000-2009年发生了加速变化。影响这一变化的因素是多方面的，其中黄河水情是主要的驱动因素。部分天然湿地之间存在一定的相关性。人工池塘的建设和水田的开垦等人为因素导致了天然湿地的减少。建设用地的增加是灌草地减少的主要原因。
Based on the 1989,2000,and 2009 Landsat TM/ETM+ images of Yellow River Delta,and in combination with GIS approach and validation-on-spot,this paper analyzed the dynamic evolution and its driving factors of natural wetlands in the Delta.Under the effects of water and salinity,the spatial distribution of the natural wetlands presented a regular change pattern.The annual change gradient and dynamic degree of the natural wetlands area was-0.3 and 3.1 in 1989-2000,and -1.8 and 5.1 in 2000-2009,respectively,indicating an accelerated change of the natural wetland area in 2000-2009.Many factors affected this change,of which,the water regime of Yellow River was the main driving factor.There existed definite correlations between parts of the natural wetlands.Human factors such as the construction of culture pond and the reclamation for paddy field contributed to the reduction of natural wetlands.The increasing construction land was the main reason for the reduction of bush-grass lands.