Scaling leaf respiration with nitrogen and phosphorus in tropical forests across two continents.
Scaling leaf respiration with nitrogen and phosphorus in tropical forests across two continents.
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DOI：
10.1111/nph.13992
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发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
Meir P
中科院分区：
文献类型：
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作者：
Rowland L;Zaragoza-Castells J;Bloomfield KJ;Turnbull MH;Bonal D;Burban B;Salinas N;Cosio E;Metcalfe DJ;Ford A;Phillips OL;Atkin OK;Meir P
叶暗呼吸是控制热带森林碳平衡的重要组成部分。在这里，我们测试氮（N）和磷（P）如何影响R黑暗及其与光合作用的关系，使用三个广泛分离的热带森林，不同的土壤肥力。 在法属圭亚那、秘鲁和澳大利亚的182个物种的431棵热带雨林树冠上测量了R暗。研究了在大气CO2浓度饱和和环境CO2浓度饱和条件下，叶片氮、磷含量、叶片结构和最大光合速率与R暗度的关系。我们发现，最低的生育率（法属圭亚那）的网站表现出更大的R黑暗每单位叶N，P和光合作用的速率。来自澳大利亚的数据，其中有没有系统发育重叠的样品从南美网站，产生了最明显的关系R黑暗与测得的叶性状。我们的数据表明，没有一个单一的普遍的比例关系占R黑暗在这个大的地理空间的变化。R暗的绝对速率和R暗：光合作用比的站点之间的变化是由N-和P-利用效率的变化驱动的，这与分类和环境的变化有关。另见McDowell & Xu，214：903-904对这篇文章的评论。
Leaf dark respiration (R dark) represents an important component controlling the carbon balance in tropical forests. Here, we test how nitrogen (N) and phosphorus (P) affect R dark and its relationship with photosynthesis using three widely separated tropical forests which differ in soil fertility. R dark was measured on 431 rainforest canopy trees, from 182 species, in French Guiana, Peru and Australia. The variation in R dark was examined in relation to leaf N and P content, leaf structure and maximum photosynthetic rates at ambient and saturating atmospheric CO 2 concentration. We found that the site with the lowest fertility (French Guiana) exhibited greater rates of R dark per unit leaf N, P and photosynthesis. The data from Australia, for which there were no phylogenetic overlaps with the samples from the South American sites, yielded the most distinct relationships of R dark with the measured leaf traits. Our data indicate that no single universal scaling relationship accounts for variation in R dark across this large biogeographical space. Variability between sites in the absolute rates of R dark and the R dark : photosynthesis ratio were driven by variations in N‐ and P‐use efficiency, which were related to both taxonomic and environmental variability. See also the Commentary on this article by McDowell & Xu, 214: 903–904.