OALib Journal期刊
ISSN: 2333-9721
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黄土高原山地森林群落植物区系特征与地理格局
DOI: 10.11821/dlxb201407004, PP. 916-925
Keywords: 地理格局,植物区系,黄土高原,森林群落,R/T值
Abstract:
本文以样地数据为基础,对黄土高原内11座山地森林群落的区系组成、联系、格局以及与气候因子的关系等方面进行了较为系统的分析,结果表明(1)研究区内森林群落物种丰富,353个样地共调查到维管植物108科473属1222种,其中被子植物93科447属1179种,裸子植物4科7属9种,蕨类植物11科19属34种。(2)按区域和局地两个尺度统计显示,研究区内科、属分布区类型以“温带分布”特别是“北温带分布”为主,此特征在群落尺度上尤显突出。(3)非度量多维度标度排序(NMDS)第一轴主要揭示各山地森林分布的典型海拔变化范围,第二轴则展示出各山地的地理纬度位置关系;系统聚类树同样体现出各山地间基于区系组成特征的地理空间联系与南北位置关系,并将各山地依区系组成特征划分为4组;经比较山地间最大S?renson相似性系数知,贺兰山因地处区域西北边缘而与其他山地间区系联系最弱,反之太岳山与其他山地区系联系最强。(4)R/T值(热带属与温带属比值)线性回归模型解释了42.1%的数据变异,并揭示该值随年均温升高呈显著上升趋势,随着海拔升高则有显著下降趋势,但与年均降水量之间并无显著趋势。
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