Winter Klaus, Troughton John H, Card Kay A
Fachbereich Biologie, Botanisches Institut der Technischen Hochschule, Schnittspahnstr. 3-5, D-6100, Darmstadt, Germany.
Physics and Engineering Laboratory, Department of Scientific and Industrial Research, Lower Hutt, New Zealand.
Oecologia. 1976 Jun;25(2):115-123. doi: 10.1007/BF00368848.
δC values were measured for 45 Poaceae species collected in the northern Sahara desert, at the foot of the Saharan Atlas. The results indicate a clear relationship between carbon isotope discrimination and phytogeographical distribution of the grasses. Mediterranean species predominantly had δC values indicating the C pathway of photosynthesis. By contrast, nearly all species belonging to the Saharo-Arabian and /or Sudanian group showed a C like carbon isotope composition. Leaf material of two species, Lygeum spartum and Stipa tenacissima, had δC values in the region of-20‰, i.e. intermediate between the mean δC values of C and C plants. However, additional speciments of both these grasses obtained from a different source (herbarium of the Hebrew University, Jerusalem) yielded a C like carbon isotope composition.
对在撒哈拉沙漠北部、撒哈拉阿特拉斯山脉脚下采集的45种禾本科植物的δC值进行了测量。结果表明，碳同位素判别与禾本科植物的植物地理分布之间存在明显关系。地中海物种的δC值主要表明光合作用的C途径。相比之下，几乎所有属于撒哈拉-阿拉伯和/或苏丹组的物种都显示出类似C4的碳同位素组成。两种植物，刺叶疏花针茅（Lygeum spartum）和坚韧针茅（Stipa tenacissima）的叶片材料的δC值在-20‰左右，即介于C3和C4植物的平均δC值之间。然而，从不同来源（耶路撒冷希伯来大学植物标本馆）获得的这两种禾本科植物的其他样本产生了类似C4的碳同位素组成。
