Mooney H A, Field C, Gulmon S L, Bazzaz F A
Department of Biological Sciences, Stanford University, 94305, Stanford, California, USA.
Department of Botany, University of Illinois, Urbana, Illinois, USA.
Oecologia. 1981 Aug;50(1):109-112. doi: 10.1007/BF00378802.
Desert annuals of Death Valley, California have higher average light-saturated photosynthetic capacities and leaf nitrogen contents than do early-successional annuals of Illinois. The leaves of annuals in the light-unlimited Death Valley environment change little in specific weight, nitrogen, or photosynthetic capacity with age. In contrast, these properties decrease markedly with age in the leaves of the Illinois annuals even in leaves not exposed to the usual shading that accompanies canopy development. These results are interpreted in a carbon-gained-per-nitrogen-invested context.
加利福尼亚州死亡谷的沙漠一年生植物比伊利诺伊州早期演替的一年生植物具有更高的平均光饱和光合能力和叶片含氮量。在光照不受限的死亡谷环境中，一年生植物的叶片在比重、含氮量或光合能力方面，随年龄增长变化不大。相比之下，即使伊利诺伊州一年生植物的叶片没有受到树冠发育通常伴随的遮荫影响，这些特性也会随年龄显著下降。这些结果是在每投入一份氮素所获得的碳量的背景下进行解释的。
