气候和地形对青藏高原树线位置的影响

被引:6
作者
王亚锋 [1 ]
刘波 [2 ]
机构
[1] 南京林业大学生物与环境学院
[2] 西北大学城市与环境学院
关键词
森林上限; 小气候; 树线; 地形;
D O I
10.13292/j.1000-4890.201812.030
中图分类号
Q948 [植物生态学和植物地理学];
学科分类号
071012 ; 0713 ;
摘要
地形等非温度因子可能对树线位置有显著影响,这在一定程度上解释了为何变暖背景下树线位置的爬升幅度十分有限。为检验这一想法,本文研究了青藏高原阳坡和阴坡的树线位置与气候、地形等非气候因子之间的关系。收集了近10年来青藏高原树线文献中的64个样点及相关环境因子(树线位置、地形等),基于全球气候数据库,利用ArcGIS软件提取了样点气候状况。利用广义线性模型评估了热量因子(生长季温度)和非热量因子(坡向、降水等)对青藏高原树线位置的相对贡献。结果表明:7月最低气温是青藏高原树线位置最显著的预测因子,其可解释方差的40%;而坡向对树线位置的空间分布也有显著影响,其可解释方差的7%。因此,青藏高原树线位置主要受7月最低气温的驱动,且受到坡向的影响。这一结果为理解高山树线位置的驱动因子提供了新认识。
引用
收藏
页码:3508 / 3515
页数:8
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