Two tropical forest trees ( T. Chen and Muell. Arg), cultivated both in pure or mixed planting systems under drought and nitrogen-applied conditions, were selected at seedling stages as experimental materials to investigate their eco-physiological responses, interactions with neighboring trees, and the stoichiometry of carbon (C), nitrogen (N), and phosphorus (P). The results highlighted significant differences in biomass allocation between , which allocates more to root growth, and , favoring stem growth. It demonstrates that mixed planting enhances tree growth under well-watered conditions, while nitrogen application promotes growth across different moisture levels, with species-specific responses. Water and nitrogen interaction notably affects growth but less so for , revealing complex effects on their biochemical responses to oxidative stress. The mixed planting benefits both species, influencing nutrient dynamics and stoichiometry in . The study also shows that nitrogen application under well-watered conditions alters nutrient ratios, particularly affecting nutrient availability and competition between species in mixed planting setups. In conclusion, this research emphasizes the complex interplay between planting patterns, water, and nitrogen, which significantly impacts tree growth, nutrient dynamics, and stress responses, suggesting that specific management strategies could optimize forestry practices.

中文翻译：

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不同种植模式下巴西橡胶树和降香黄檀的生态化学计量及其对干旱和氮素的适应

选择两种热带林木（T. Chen 和 Muell. Arg），在干旱和施氮条件下纯植或混植，在苗期作为实验材料，研究它们的生态生理反应以及与邻近树木的相互作用，以及碳 (C)、氮 (N) 和磷 (P) 的化学计量。结果凸显了 和 之间生物量分配的显着差异，前者分配更多给根生长，后者有利于茎生长。它表明，混合种植可以在水分充足的条件下促进树木生长，而施氮可以促进不同湿度水平下的生长，并具有物种特异性的反应。水和氮的相互作用显着影响生长，但对 的影响较小，揭示了其对氧化应激的生化反应的复杂影响。混合种植对两个物种都有好处，影响营养动态和化学计量。研究还表明，在浇水良好的条件下施氮会改变养分比例，特别是影响混合种植环境中养分的可用性和物种之间的竞争。总之，本研究强调了种植模式、水和氮之间复杂的相互作用，这对树木生长、养分动态和应激反应产生显着影响，表明特定的管理策略可以优化林业实践。