The seasonal variations of source contributions were distinct, and spatial variations were perceptible.
污染源贡献具有明显的季节变化，并存在一定的地域变化。
The results are as following: (1)The topographic characteristics are critical for the spatial variations of vegetation.
结果表明：（ 1 ）影响乔木、灌木和草本层植被格局变化的首要因子都是地形特征；
The trends of air temperature, precipitation and sunshine duration changes exhibited spatial variations over the research regions.
研究区气温、降水量、日照时数的变化趋势在空间分布上存在着一定的区域差异。
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