Mooney H A, Ferrar Pamela J, Slatyer R O
Reseach School of Biological Sciences, Australian National University, Canberra, Australia.
Oecologia. 1978 Jan;36(1):103-111. doi: 10.1007/BF00344575.
Eucalytptus species originating in Australian habitats differing in moisture regimes were examined under uniform growth conditions for their photosynthetic characteristics and allocation patterns. Species from the driest environments, the 'mallee' types, had the smallest leaf sizes and the highest leaf specific weights; and forest species, from moist coastal sites, had the largest and thinnest leaves. Photosynthetic rates on a dry weight basis were highly correlated with leaf nitrogen content in all species. Leaf nitrogen content on a dry weight basis varied little between species in nature; however, there were increasing amounts of nitrogen per unit leaf area as the habitat became drier because of the changes in specific leaf weight. This resulted in a greater light-saturated photosynthetic rate per leaf area of arid habitat species, which were presumably more efficient in water use as a consequence. A simple simulation model showed that changes in the allocation ratio to leaf weight reduces total leaf area in the expected direction without affecting total dry matter accumulation.
对源自澳大利亚不同水分条件栖息地的桉树种在统一生长条件下的光合特性和分配模式进行了研究。来自最干旱环境的“马利”类型树种叶片尺寸最小，叶比重最高；而来自潮湿沿海地区的森林树种叶片最大且最薄。以干重计的光合速率与所有树种的叶片氮含量高度相关。自然条件下，以干重计的叶片氮含量在不同树种间变化不大；然而，由于比叶重的变化，随着栖息地变得更干燥，单位叶面积的氮含量增加。这导致干旱栖息地树种的单位叶面积光饱和光合速率更高，因此它们可能在水分利用方面更高效。一个简单的模拟模型表明，叶片重量分配比例的变化会按预期方向减少总叶面积，而不影响总干物质积累。
