摘 要
为探讨施肥对楠木幼林生长的影响，本研究以3年生楠木人工林为对象，在四川省某试验基地开展了为期两年的田间试验。试验设置4种施肥处理（氮肥、磷肥、钾肥及氮磷钾复合肥）与对照组，分析不同施肥方案对楠木幼林高度、地径、冠幅以及生物量积累的影响。结果表明，施用氮磷钾复合肥显著促进了楠木幼林的高度和地径生长，其年均增长率分别较对照组提高了28.6%和35.4%，同时显著增加了单株生物量和叶绿素含量。单独施用氮肥或磷肥对楠木幼林生长也有一定促进作用，但效果不及复合肥显著；而钾肥处理对楠木幼林生长的影响相对有限。研究表明，合理配比的氮磷钾复合肥能够显著提升楠木幼林的生长速度和生物量积累，为楠木人工林的高效栽培提供了科学依据。该研究创新性地量化了不同肥料配比对楠木幼林生长的具体影响，为优化楠木人工林施肥管理策略奠定了基础。关键词：楠木幼林; 氮磷钾复合肥; 生长指标; 生物量积累; 施肥管理策略
Abstract
To investigate the effects of fertilization on the growth of young Phoebe zhennan forests, a two-year field experiment was conducted at an experimental base in Sichuan Province using three-year-old P. zhennan plantations as the study subject. Four fertilizer treatments (nitrogen, phosphorus, potassium, and compound NPK fertilizer) and a control group were established to analyze the impacts of different fertilization regimes on tree height, ground diameter, crown width, and biomass accumulation of young P. zhennan trees. The results demonstrated that the application of compound NPK fertilizer significantly promoted both height and ground diameter growth, increasing the annual average growth rates by 28.6% and 35.4%, respectively, compared to the control group. Additionally, it significantly enhanced individual tree biomass and chlorophyll content. The use of nitrogen or phosphorus alone also had a certain promoting effect on the growth of young P. zhennan trees but was less effective than the compound fertilizer. In contrast, the potassium treatment exhibited relatively limited influence on the growth of young P. zhennan trees. This study indicates that appropriately proportioned compound NPK fertilizer can significantly improve the growth rate and biomass accumulation of young P. zhennan forests, providing a scientific basis for efficient cultivation practices. Innovatively, this research quantitatively assessed the specific impacts of different fertilizer combinations on the growth of young P. zhennan trees, laying a foundation for optimizing fertilization management strategies in P. zhennan plantations.Key words:Nanmu Young Forest; Nitrogen Phosphorus Potassium Compound Fertilizer; Growth Index; Biomass Accumulation; Fertilization Management Strategy
目 录
中文摘要 I
英文摘要 II
引 言 1
第1章、楠木幼林生长特性分析 3
1.1、楠木幼林生长基础特征 3
1.2、生长环境对楠木的影响 3
1.3、楠木幼林施肥需求评估 3
第2章、不同施肥处理方案设计 5
2.1、施肥类型与剂量选择 5
2.2、施肥时间与频率安排 5
2.3、施肥方法的技术要求 6
第3章、施肥处理对楠木生长的影响研究 7
3.1、树高增长的响应机制 7
3.2、地径变化的量化分析 7
3.3、叶片养分吸收效率 7
第4章、施肥效果评价与优化建议 9
4.1、生长指标综合评价 9
4.2、经济效益与生态效益分析 9
4.3、优化施肥策略探讨 9
结 论 11
参考文献 12
