天童国家森林公园若干树种叶水平上养分利用效率的研究

养分利用效率是养分循环研究中一个极为有用的概念 ,它反映了植物对养分的利用状况。为揭示不同生活型植物的营养策略 ,本文以天童国家森林公园若干种植物为研究材料 ,探讨不同植物的NUE大小以及不同生活型植物NUE差异。结果表明 ,常绿植物的NUEN 与NUEP 呈显著正相关 ,落叶植物的NUEN 与NUEP 相关性不显著 ;若对所有植物进行统计 ,则NUEN 与NUEP 呈显著正相关。同时 ,不同生活型植物的N营养分利用效率有显著差异 ,具体表现为针叶树 >常绿阔叶树 >落叶树。最后 ,作者认为在生产力最低的地方 ,植物的NUE最高 ,说明养分供应缺乏时 ,这些植物能更有效地利用所获得的养分来创造出更高的生物量

Leaf nutrient use efficiency of some trees in Tiantong National Forest Park

The concept of nutrient use efficiency (NUE) plays an important role in the study of nutrient cycling. To reveal the nutrient use strategy, NUE of several trees in Tiantong National Forest Park were studied in this paper, focusing on the difference of the NUE between different life forms. The result showed that there was a significant positive correlation between NUE N and NUE P in evergreen broad leaved species, but not in deciduous species. Meanwhile, all plants have a positive correlation between NUE N and NUE P. In addition, there was an obvious difference in NUE N among different life forms, conifer species> evengreen broad leaved species > deciduous species. Finally, the authors agreed that plants had the highest NUE when their habitat's productivity was the lowest. It indicated that these plants can use available nutrients effectively to produce more biomass when there is a deficiency in nutrient availability.