Wang Wenyue, Hua Jinguo, Zhang Zhen, Zhou Zhichun, Wu Renchao, Qu Simin, Chu Xiuli
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang, China.
Zhejiang Key Laboratory of Forest Genetics and Breeding, Hangzhou, Zhejiang, China.
Front Plant Sci. 2025 Aug 5;16:1606643. doi: 10.3389/fpls.2025.1606643. eCollection 2025.
Phosphorus is vital for plant growth but is often limited in subtropical acidic soils, restricting forest productivity. , a key timber and resin species in China, shows varied shoot-sprouting characteristics and nutrient use under different phosphorus levels. Understanding its response to fertilization is crucial for optimizing plantation management and growth.
We employed a two-factor randomized block design with three hybrid varieties (with shared male or female parents) and four phosphate fertilizer levels (0, 100, 250, 500 g·plant⁻¹). After three growing seasons, tree height, diameter at breast height (DBH), annual shoot growth characteristics (fixed growth, free growth, shoot number), and growth amount were measured. Nitrogen and phosphorus contents in coniferous leaves were also analyzed.
Results showed significant differences in tree height, DBH, and fixed growth among varieties and fertilizer treatments. The 500 g·plant⁻¹ treatment performed best, with fixed growth 14.35% higher than the control. Free growth and shoot flushing frequency showed no significant differences among treatments. The interaction between variety and fertilization contributed 74.10% to free growth variation. Phosphorus fertilization enhanced growth and nutrient uptake in young saplings. Increasing fertilizer intensity raised nitrogen and phosphorus contents and the nitrogen-phosphorus ratio. Correlation analysis revealed that the nutrient environment influences genetic expression among traits, affecting their interrelationships.
This study examines how genotype, phosphate fertilizer intensity, and their interaction influence the growth and shoot-sprouting behavior of hybrids. Phosphate fertilization is a key driver of early growth and nutrient accumulation, while shoot-sprouting is largely shaped by variety-fertilizer interactions. Findings highlight the need to focus less on the genetic basis of shoot growth and more on how nutrient availability influences variety performance, supporting precise fertilization strategies for optimized forest management.
磷对植物生长至关重要，但在亚热带酸性土壤中往往含量有限，限制了森林生产力。杉木是中国一种重要的木材和树脂树种，在不同磷水平下表现出不同的萌条特性和养分利用情况。了解其对施肥的反应对于优化人工林管理和生长至关重要。
我们采用双因素随机区组设计，有三个杉木杂交品种（具有共同的父本或母本）和四个磷肥水平（0、100、250、500克·株⁻¹）。经过三个生长季节后，测量树高、胸径（DBH）、年萌条生长特性（固定生长、自由生长、萌条数）和生长量。还分析了针叶中的氮和磷含量。
结果表明，品种和施肥处理之间在树高、胸径和固定生长方面存在显著差异。500克·株⁻¹处理表现最佳，固定生长比对照高14.35%。自由生长和萌条抽梢频率在各处理之间没有显著差异。品种与施肥之间的相互作用对自由生长变异的贡献率为74.10%。磷肥促进了幼龄杉木幼树的生长和养分吸收。增加施肥强度提高了氮、磷含量以及氮磷比。相关分析表明养分环境影响性状间的基因表达，进而影响它们之间的相互关系。
本研究考察了基因型、磷肥强度及其相互作用如何影响杉木杂交种的生长和萌条行为。磷肥是早期生长和养分积累的关键驱动因素，而萌条生长在很大程度上受品种-肥料相互作用的影响。研究结果强调，应减少对萌条生长遗传基础的关注，更多地关注养分有效性如何影响品种表现，以支持优化森林管理的精准施肥策略。
