摘要
根据实测的２８０余种植物的稳定性碳同位素值（δ１３Ｃ）和内蒙古地区植被资料以及国内外已发表的Ｃ４植物名录，从分类学和生态学角度划分并整理出内蒙古地区的野生Ｃ４植物。共有Ｃ４植物１２５种，隶属于１２科５７属。Ｃ４植物所在的科、属、种分别占内蒙古全区维管植物科、属、种的９％、８．４％和５．４％。分析了该地区Ｃ４植物的分类群、生活型、水分生态型与区系地理成分等特性，并对其与环境间的关系作了探讨。Ｃ４植物分布的科、属均极其集中，８２．４％集中于禾本科、藜科和莎草科，与它们固有的遗传特性有关。生活型以一年生草本植物居多，可能起源于草本的某些科属。水分生态型总体偏旱，与Ｃ４植物的起源相一致，为喜热。
Identification of C 4 photosynthetic pathway and their florology and eco geography were studied in Inner Mongolia of China according to the stable carbon isotope (δ 13 C) contents and some related literatures. The total number of C 4 plants in the region was 125 species, belonging to 12 families and 57 genera which reached to 5.4%, 9%, and 8.4% of total species, families and genera respectively in Inner Mongolia area. Most of the C 4 plants (82.4%) came from Poaceae, Chenopodiaceae and Cyperaceae families. Based on the above features, the authors have analysed the characteristics, such as life form, water ecotype and distribution, of C 4 species in Inner Mongolia. Finally, the relationship between distribution of C 4 photosynthesis and some environmental factors in determining C 4 plant distribution were also discussed. Most of the C 4 species were highly concentrated to a few families and genera, which could be contributed to their own hereditary features. The life form of most C 4 species was found to be annual herbs, possibly owing to their narrow origin families or genera. The water ecotypes of C 4 plants in this area was shown to be drought, indicating that such species preferred to heat and could resist drought habitat well.
基金
国家自然科学基金
科技部"九五"重大基础研究预选项目
关键词
C4植物
水分生态型
区系地理成分
生态分布
C 4 plant, Life form, Water ecotype, Geographical element of flora, Ecological distribution
