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
Atlantic Forest tree seedlings with contrasting ecological characteristics present specific growth and physiological responses to nitrogen and phosphorus addition in the soil.
Abstract
Nitrogen (N) and phosphorus (P) are commonly the most limiting nutrients for plant growth in tropical forests. Many of these ecosystems are exposed to increasing rates of anthropogenic nutrient deposition. This study aims to assess how five Atlantic Forest tree species respond to N and P addition to the soil. Five species with different levels of shade tolerance were subjected to nine weekly soil applications of (NH4)2SO4 (84 kg N ha−1 treatment N), NaH2PO4 (45 kg P ha−1 treatment P), both nutrients (treatment N + P), or water. Soil, foliar nutrient concentrations, and biometric and gas exchange analyses were performed. No changes in the soil pH or total N and P availability were observed in the soil after N addition, whereas P accumulated in the soil and leaves of three species after P addition. The pioneer species H. popayanensis presented increased total biomass with P and N+P treatments, while C. floribundus increased with P treatment and C. pachystachya increased with N + P treatment. N and P treatments reduced the photosynthesis of C. pachystachya and the stomatal conductance of C. pachystachya and C. floribundus. The growth rate and total biomass of C. estrellensis reduced with N and P treatments and increased with N+P treatment. Aspidosperma polyneuron presented reduced photosynthesis with N treatment, but increased total biomass with all treatments, especially N + P. The diversity of growth and physiological responses to N and P addition suggests that each species has specific nutrient requirements and uses strategies related to the niche occupied by each one.
摘要氮（N）和磷（P）通常是热带森林中植物生长的最大限制性养分。这些生态系统中的许多都面临着人为养分沉积率不断增加的问题。本研究旨在评估大西洋森林中的五个树种对土壤中添加氮和磷的反应。五种耐阴程度不同的树种每周在土壤中施用九次（NH4）2SO4（84 千克 N ha-1 处理 N）、NaH2PO4（45 千克 P ha-1 处理 P）、两种养分（处理 N + P）或水。对土壤、叶片养分浓度以及生物计量和气体交换进行了分析。添加氮元素后，土壤中的 pH 值或氮和磷的总供应量没有发生变化，而添加磷元素后，三个物种的土壤和叶片中都积累了磷。先锋物种 H. popayanensis 在添加 P 和 N+P 处理后总生物量增加，C. floribundus 在添加 P 处理后总生物量增加，C. pachystachya 在添加 N+P 处理后总生物量增加。氮和磷处理降低了 C. pachystachya 的光合作用以及 C. pachystachya 和 C. floribundus 的气孔导度。在氮和磷处理下，C. estrellensis 的生长率和总生物量降低，而在氮+磷处理下，生长率和总生物量增加。Aspidosperma polyneuron 在氮处理下光合作用降低，但在所有处理下，特别是在氮+磷处理下总生物量增加。
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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