Chen Jialan, Zhu Weisong, Liu Yuanxi, Chen Gang, Han Juncheng, Zhang Wenhao, Wu Junwen
Yunnan Provincial Key Laboratory for Conservation and Utilization of In-Forest Resource, College of Forestry, Southwest Forestry University, Kunming 650224, China.
Plants (Basel). 2025 Jul 18;14(14):2221. doi: 10.3390/plants14142221.
, a fast-growing tropical tree species, faces fertilization challenges due to slope heterogeneity in plantations. This study examined 3-year-old at upper and lower slope positions under five treatments: CK (no fertilizer), F1 (600 g/plant), F2 (800 g/plant), F3 (1000 g/plant), and F4 (1200 g/plant) of secondary macronutrient water-soluble fertilizer. Growth parameters and N-P-K stoichiometry were analyzed. Key results: (1) Height increased continuously with fertilizer dosage at both slopes, while DBH peaked and then declined. (2) At upper slopes (nutrient-poor soil), fertilization elevated leaf P but reduced branch N/K and increased root P/K. At lower slopes (nutrient-rich soil), late-stage leaf N increased significantly, with roots accumulating P/K via a "storage strategy". Stoichiometric thresholds indicated N-K co-limitation (early-mid stage) shifting to P limitation (late stage) on upper slopes and persistent N-K co-limitation on lower slopes. (3) PCA identified F4 (1200 g/plant) and F1 (600 g/plant) as optimal for upper and lower slopes, respectively. This research provides a theoretical basis for precision fertilization in plantations, emphasizing slope-specific nutrient status and element interactions for dosage optimization.
[树种名称]，一种快速生长的热带树种，由于种植园的坡度异质性而面临施肥挑战。本研究在五个处理下，对位于上坡和下坡位置的3年生[树种名称]进行了研究：对照（不施肥）、F1（600克/株）、F2（800克/株）、F3（1000克/株）和F4（1200克/株）的二级大量元素水溶性肥料。分析了生长参数和氮磷钾化学计量学。主要结果：（1）两个坡度的树高均随施肥量的增加而持续增加，而胸径先达到峰值然后下降。（2）在上坡（土壤贫瘠），施肥提高了叶片磷含量，但降低了树枝氮/钾含量，增加了根系磷/钾含量。在下坡（土壤肥沃），后期叶片氮含量显著增加，根系通过“储存策略”积累磷/钾。化学计量阈值表明，上坡从氮钾共同限制（中前期）转变为磷限制（后期），下坡则持续存在氮钾共同限制。（3）主成分分析确定F4（1200克/株）和F1（600克/株）分别为上坡和下坡的最佳施肥量。本研究为[树种名称]种植园的精准施肥提供了理论依据，强调了特定坡度的养分状况和元素相互作用以优化施肥量。
