Scholarlink

<p>Slope position, as an important topographic factor, profoundly influences the productivity and carbon allocation strategies of <i>Ochroma lagopus</i> Sw. plantations. In this study, three-year-old <i>O. lagopus</i> trees were subjected to one control (no water-soluble fertilizer, Control) and four fertilization treatments (secondary macronutrients water-soluble fertilizer applied at 600&#xa0;g/plant, F1; 800&#xa0;g/plant, F2; 1000&#xa0;g/plant, F3; and 1200&#xa0;g/plant, F4) at both upper and lower slope positions to investigate the effects of secondary macronutrients t fertilization on growth and non-structural carbohydrate (NSC) accumulation and allocation. Results showed that: (1) Fertilization significantly promoted tree height growth, whereas diameter at breast height (DBH) exhibited an initial increase followed by a decline, and further increases in the fertilization rate did not yield additional gains. (2) At the upper slope position, carbon was preferentially allocated to leaves and roots during early to middle stages, followed by accelerated translocation to branches for storage during later stages. At the lower slope position, low to moderate fertilization promoted carbon accumulation across organs, whereas excessive fertilization reduced leaf and root carbon pools. (3) Allometric growth and principal component analysis further revealed that carbon allocation tended to be integrated at the upper slope, with a relatively strong correlation between growth and branch carbon storage; in contrast, carbon allocation was relatively dispersed at the lower slope, and the association between growth and carbon storage was weakened. Integrating the variation trends of growth and physiological indices, a relatively high fertilization rate at the upper slope and a moderate fertilization rate at the lower slope may be more beneficial for the growth of <i>O. lagopus</i>. This study reveals a dynamic pattern in which slope position and secondary macronutrients fertilization jointly regulate carbon allocation in <i>O. lagopus</i>, providing a theoretical basis and practical reference for implementing topography-based differentiated precision fertilization in mountain plantations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of fertilization on the growth and non-structural carbohydrate allocation of balsa tree (Ochroma lagopus) plantations under slope heterogeneity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月6日

查看全文
  • Jialan Chen,
  • Weisong Zhu,
  • Juncheng Han,
  • Wenhao Zhang,
  • Gang Chen,
  • Junwen Wu

摘要

Slope position, as an important topographic factor, profoundly influences the productivity and carbon allocation strategies of Ochroma lagopus Sw. plantations. In this study, three-year-old O. lagopus trees were subjected to one control (no water-soluble fertilizer, Control) and four fertilization treatments (secondary macronutrients water-soluble fertilizer applied at 600 g/plant, F1; 800 g/plant, F2; 1000 g/plant, F3; and 1200 g/plant, F4) at both upper and lower slope positions to investigate the effects of secondary macronutrients t fertilization on growth and non-structural carbohydrate (NSC) accumulation and allocation. Results showed that: (1) Fertilization significantly promoted tree height growth, whereas diameter at breast height (DBH) exhibited an initial increase followed by a decline, and further increases in the fertilization rate did not yield additional gains. (2) At the upper slope position, carbon was preferentially allocated to leaves and roots during early to middle stages, followed by accelerated translocation to branches for storage during later stages. At the lower slope position, low to moderate fertilization promoted carbon accumulation across organs, whereas excessive fertilization reduced leaf and root carbon pools. (3) Allometric growth and principal component analysis further revealed that carbon allocation tended to be integrated at the upper slope, with a relatively strong correlation between growth and branch carbon storage; in contrast, carbon allocation was relatively dispersed at the lower slope, and the association between growth and carbon storage was weakened. Integrating the variation trends of growth and physiological indices, a relatively high fertilization rate at the upper slope and a moderate fertilization rate at the lower slope may be more beneficial for the growth of O. lagopus. This study reveals a dynamic pattern in which slope position and secondary macronutrients fertilization jointly regulate carbon allocation in O. lagopus, providing a theoretical basis and practical reference for implementing topography-based differentiated precision fertilization in mountain plantations.