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地理学报  2007 

黄土高原祖厉河流域潜在植被分布模拟研究

DOI: 10.11821/xb200701006, PP. 52-61

Keywords: 祖厉河流域,甘肃省,潜在自然植被,植被盖度,空间分布,地理信息系统

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Abstract:

植被空间分布格局深受环境影响,分析植被与环境之间的关系一直是植物生态学的中心问题。论文从黄土高原自然植被恢复问题出发,引出植被恢复的参照标准-潜在自然植被。依据气象站和雨量站观测资料,建立气温降水与海拔高度和地理位置的统计方程,以GIS为技术支撑,对两大环境变量进行空间化。通过野外观测取样,结合气温降水的空间分布,界定祖厉河流域不同草地覆盖度的生境空间。根据生境空间边界函数,对整个流域内的潜在草地植被分布进行模拟。草地分布现状与潜在草地分布对比发现,低覆盖草地由北向南扩展,占潜在中覆盖草地面积的37.39%,占潜在高覆盖草地面积的34.98%。中覆盖草地也在此向南部区域和北部山地扩展,占潜在高覆盖草面积的11.51%。高覆盖草地收缩到南部和北部山地狭小地带,仅占其应有区域的4.84%。

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