利用看似不相关的混合效应模型量化落叶松混交林养分分配模式

IF 3.7 2区农林科学 Q1 FORESTRY

Forest Ecology and Management Pub Date : 2025-09-12 DOI:10.1016/j.foreco.2025.123161

Jiaxin Tian , Lihu Dong , Longfei Xie , Zheng Miao , Aiyun Ma , Xin Liu , Xinyang Zou , Fengri Li

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引用次数: 0

摘要

落叶松（Larix olgensis）和白蜡（Fraxinus mandshurica）是东北混交林的重要木材树种。了解物种如何在这些人工林中相互作用对于优化养分利用和减少竞争至关重要。利用210棵破坏性采样树（105棵落叶松和105棵白杨）的数据，我们研究了两种树种6个器官（边材、心材、树皮、枝、叶和根）中碳(C)、氮(N)和磷(P)的差异。我们分析了两种树种不同器官间C、N和P浓度的差异。采用ANCOVA分析C、N和P的分配，强调种间和种内竞争效应。我们进一步采用了一个看似无关的混合效应（SURM）模型来量化碳、氮和磷的质量分配模式。结果表明，落叶松碳含量高于灰分，灰分氮含量高于落叶松。叶片氮、磷浓度显著高于其他组分。种间和种内竞争均显著影响碳、氮和磷的分配。种内竞争增加了茎C，但减少了茎N的分配。种间竞争促进了地上C，优先考虑茎而不是叶。P配置表现出复杂的交互作用，种内呈负相关，种间呈正相关。落叶松的碳分配效率优于灰分，证实了混交林的物种特异性优化。综合胸径（DBH）、树高(H)和树冠长（CL）的SURM模型拟合效果良好。该研究为理解落叶松养分分配提供了一个定量框架，并强调了与单一栽培相比，混交林在优化养分循环方面的优势，在单一栽培中，竞争制约了资源的有效分配。我们的研究结果通过阐明混合林分平衡养分分配的途径来推进森林管理策略和生态可持续性。

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Quantifying nutrient allocation patterns in larch-ash mixed plantations via seemingly unrelated mixed-effects model

Larch (Larix olgensis) and ash (Fraxinus mandshurica) are key timber species, widely used in mixed plantations in Northeast China. Understanding how species interact in these plantations is crucial to optimizing nutrient use and minimizing competition. Using the data obtained from 210 destructively sampled trees (105 larch and 105 ash), we examined differences in carbon (C), nitrogen (N), and phosphorus (P) across six organs (sapwood, heartwood, bark, branches, foliage, and roots) of both species. We analyzed C, N, and P concentrations differences across organs of both tree species. ANCOVA was used to analyze C, N, and P allocation, emphasizing interspecific and intraspecific competition effects. We further employed a seemingly unrelated mixed-effects (SURM) model to quantify C, N, and P mass allocation patterns. The results indicated that larch exhibited higher C concentrations than ash, while ash showed higher N concentrations than larch. Foliage N and P concentrations significantly exceeded other components. Both interspecific and intraspecific competition significantly influence C, N, and P allocation. Intraspecific competition enhanced stem C but reduced stem N allocation. Interspecific competition promoted above-ground C, prioritizing stems over foliage. P allocation showed complex interactions, negative stem-branch correlations intraspecifically, positive root investment interspecifically. Larch exhibited superior C allocation efficiency versus ash, confirming species-specific optimization in mixed plantations. The SURM model incorporating diameter at breast height (DBH), tree height (H), and crown length (CL), showed an excellent fit. This study provides a quantitative framework for understanding larch-ash nutrient allocation and underscores the advantage of mixed plantation in optimizing nutrient cycling compared to monocultures, where competition constrains efficient resource allocation. Our findings advance forest management strategies and ecological sustainability by elucidating pathways for balanced nutrient allocation in mixed stands.

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来源期刊

Forest Ecology and Management 农林科学-林学

CiteScore

7.50

自引率

10.80%

发文量

665

审稿时长

39 days

期刊介绍： Forest Ecology and Management publishes scientific articles linking forest ecology with forest management, focusing on the application of biological, ecological and social knowledge to the management and conservation of plantations and natural forests. The scope of the journal includes all forest ecosystems of the world. A peer-review process ensures the quality and international interest of the manuscripts accepted for publication. The journal encourages communication between scientists in disparate fields who share a common interest in ecology and forest management, bridging the gap between research workers and forest managers. We encourage submission of papers that will have the strongest interest and value to the Journal''s international readership. Some key features of papers with strong interest include: 1. Clear connections between the ecology and management of forests; 2. Novel ideas or approaches to important challenges in forest ecology and management; 3. Studies that address a population of interest beyond the scale of single research sites, Three key points in the design of forest experiments, Forest Ecology and Management 255 (2008) 2022-2023); 4. Review Articles on timely, important topics. Authors are welcome to contact one of the editors to discuss the suitability of a potential review manuscript. The Journal encourages proposals for special issues examining important areas of forest ecology and management. Potential guest editors should contact any of the Editors to begin discussions about topics, potential papers, and other details.