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冰川冻土  2012 

基于气象水文因子的呼伦湖湿地消长综合模型研究

, PP. 1310-1318

Keywords: 气象及水文因子,消长,响应,模型,呼伦湖湿地

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Abstract:

利用1961-2005年呼伦湖湿地的气象及水文资料,基于水量平衡方程,以湿地各年水量盈亏累积量(∑ΔW)为因子,建立了呼伦湖湿地水域面积和水位高程的消长对气象及水文因子协同作用的响应模型,分析了湿地水域面积和水位高程的消长对影响因子的响应特征.结果表明呼伦湖湿地消长对气象及水文因子的年代际变化有很好的响应.年平均气温每增加1℃,湿地水域面积和水位高程分别减少134.5km2和93.44cm;年降水量每增加10mm,二者分别增加10.2km2和7.1cm;年蒸发量每增加10mm,二者分别减少1.1km2和0.9cm;年径流量每增加1×108m3,二者分别增加4.8km2和3.3cm.年平均气温的升高和年降水量的减少变化对湿地消减的贡献率分别为13.6%和86.4%,当前降水量的变化在湿地消长中占主导作用.如果不考虑人类活动的影响,根据未来较低排放(SRES-B2)情景下气候预测,初步估算2040、2070和2100年湿地水域面积将分别减少275.8km2、442.8km2和583.6km2,水位高程分别下降191.6cm、307.6cm和405.4cm,未来气温的变化在湿地消长中占主导作用.呼伦湖湿地在未来暖干化趋势下,湿地水资源短缺加剧,湿地水域面积萎缩和水位高程下降将加快.

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