N deposition and light availability impact on the growth and physiology of seedlings of a shade-intolerant and a shade-tolerant tropical forest tree species
João Pedro Batista Fernandes Cunha, José Antonio Pimenta, José Marcelo Domingues Torezan, Halley Caixeta de Oliveira, Renata Stolf-Moreira
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引用次数: 0
Key message
N addition positively affected the growth of C. pachystachya (shade-intolerant) in the sun but not in the shade, while the growth of C. estrellensis (shade-tolerant) wasn’t affected.
Abstract
The Brazilian Atlantic Forest is a highly biodiverse and threatened ecosystem, subjected to intense deforestation and N deposition levels that may exceed the critical N load supported by this ecosystem. The objective of this study was to evaluate in green house conditions how 10 weekly applications of N (28 kg N ha−) affects the gas exchange, the amino acid and protein concentrations in the tissues, and the growth of seedlings two tree species: Cecropia pachystachya (Urticaceae; shade-intolerant) and Cariniana estrellensis (Lecythidaceae; shade-tolerant). Plant responses to N addition were compared on sun and on shade. While Cecropia pachystachya improved the total plant dry mass and the relative growth rate with N addition in the sun, but not in the shade, C. estrellensis increased the stomatal conductance, net photosynthesis, and instantaneous carboxylation efficiency in the shade, although without any change on the plant total biomass. The results of the study indicate that the deposition of n can have differential effects on different species.
在日光条件下，添加关键信息素对不耐阴的板栗（C. pachystachya）的生长有正向影响，对不耐阴的板栗（C. estrellensis）的生长无显著影响。摘要巴西大西洋森林是一个高度生物多样性和受威胁的生态系统，受到强烈的森林砍伐和氮沉降水平，可能超过该生态系统所支持的临界氮负荷。本研究的目的是评价在温室条件下，每周施用10次N （28 kg N ha -）对两种树种（荨麻科；不耐阴）和绿腹树（乳酸菌科；耐阴）幼苗的气体交换、组织中氨基酸和蛋白质浓度的影响。比较了植物在光照和遮荫条件下对施氮的响应。遮荫条件下，增施N能提高粗心牛皮（Cecropia pachystachya）植株总干质量和相对生长率；遮荫条件下，绿皮牛皮（C. estrellensis）气孔导度、净光合作用和瞬时羧化效率，但对植株总生物量没有影响。研究结果表明，氮沉降对不同物种的影响是不同的。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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