甘南州近35年蒸发量时空演变特征及对环境的影响

通过借助GIS空间分析技术、小波分析方法和数理统计理论,对甘南州近35年来蒸发量时空特征进行定性分析并阐述其对生态环境的影响.结果表明:近35年来甘南州蒸发量总体上呈上升趋势且通过了显著性检验,其中上升趋势最快的是甘南州东南部区域的舟曲和卓尼.从时间上看,蒸发量的变化呈波动式上升状态.其中1980s是整个甘南州蒸发量最...

The spatio-temporal characteristics of evaporation change and its influence in Gannan Prefecture in recent 35 years

We analyzed the temporal and spatial characteristics of the evaporation capacity and variation of evaporation in recent 35 years in Gannan Prefecture of Gansu Province combined with GIS spatial techniques,wavelet analysis and mathematical statistical theory,and illuminated the influence of ecological environment.The results showed that the changing trend of evaporation capacity was an overall upward by passing distinctly test and the trend was remarkable in Zhouqu and Zhuoni of the southeastern region.In terms of the time,the changing trend of evaporation capacity was fluctuant situation upward and evaporation in whole of Gannan Prefecture was the minimum flow in the early 1980s,while the evaporation capacity was ascending trend in other area,especially in the 21Century.In terms of the space,the difference of distributing evaporation which was the biggist having the incremental trend from northwest to southeastern region was in accord with distribution dryness.In terms of the period,the periodicity of annual evaporation was distinct,the main period oscillate was 12a and 17-18a.In terms of the influence,ecological environment of the region degenerated gradually,especially the phenomenon of water resource and marsh areas being reduced and the grassland being degenerated was obvious.