Rundel Philip W
Department of Ecology and Evolutionary Biology, University of California, 92717, Irvine, CA, USA.
Oecologia. 1982 Dec;55(3):409-413. doi: 10.1007/BF00376930.
Comparative studies of nitrogen utilization efficiencies (g assimilation mg leaf nitrogen expended) for dominant chaparral shrubs of California and matorral shrubs of central Chile indicate varying relationships of these efficiencies to total shrub productivity and community dominance. In California where nitrogen is limiting for shrub growth, increasing nitrogen utilization efficiency is correlated with increased productivity, and species with the highest values are dominant on polar (north-facing) slopes. In Chile where soil nutrients are not strongly limiting, increased nitrogen utilization efficiency beyond a low threshold has little or no effect on productivity. This may be an important aspect of the relative ecological success of deciduous shrubs in Chile. High nitrogen utilization efficiency in Chile is associated with broad ecological amplitude rather than increased competitive ability through higher productivity.
对加利福尼亚州优势丛林灌木和智利中部马托拉尔灌木的氮利用效率（每消耗毫克叶片氮的同化克数）进行的比较研究表明，这些效率与灌木总生产力和群落优势之间存在不同的关系。在加利福尼亚州，氮对灌木生长具有限制作用，氮利用效率的提高与生产力的增加相关，氮利用效率最高的物种在阴坡（朝北的山坡）占主导地位。在智利，土壤养分没有受到强烈限制，氮利用效率超过低阈值后，对生产力几乎没有影响。这可能是智利落叶灌木相对生态成功的一个重要方面。智利的高氮利用效率与广泛的生态幅度相关，而不是通过更高的生产力来提高竞争能力。
