Modeling the influence of competition, climate, soil, and their interaction on height to crown base for Korean pine plantations in Northeast China

IF 2.6 2区 农林科学 Q1 FORESTRY European Journal of Forest Research Pub Date : 2024-07-09 DOI:10.1007/s10342-024-01710-z
Yunfei Yan, Junjie Wang, Suoming Liu, Damodar Gaire, Lichun Jiang
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Abstract

Height to crown base (HCB) is an important tree-level characteristic used to determine crown size and serves as an important input variable for forest growth and yield models. Competition between forest stands and environmental conditions are the main factors influencing HCB not only through independent effects but also through interactive effects. In addition, it is unclear whether these effects on HCB differ depending on the social status of the tree. Accordingly, we conducted a pioneering study to assess the independent and interactive effects of competition, climate, and soil on HCB using measurements from a total of 7188 Korean pine (Pinus koraiensis) trees at 98 sample plots located in northeastern China. Moreover, HCB simulations under different competitive conditions or soil gradients were provided based on the actual local climatic types to provide targeted recommendations for plantations. The results showed that stand basal area (BA), the basal area of trees larger than the subject tree (BAL), mean temperature of the coldest month (MCMT), Hargreaves climatic moisture deficit (CMD), and total nitrogen (TN) were the main factors influencing HCB. As CMD increases, the influence direction of BA and MCMT on HCB changes, and the intensity of their influence decreases. The results of hierarchical partitioning analysis showed that the impacts of climate on HCB were different depending on social status. Suppressed trees exhibit a lower climate sensitivity compared to dominant and intermediate trees. Simulation results indicate that regulating stand competition through thinning operations and adjusting soil nitrogen content by increasing understory vegetation promote crown recession, thereby increases HCB. Our findings highlight the significance of independent and interactive considering competition, climate, and soil variables to improve HCB model predictions at large spatial scales and guidance on stand management in the context of climate change.

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模拟竞争、气候、土壤及其相互作用对中国东北朝鲜松人工林冠基高度的影响
树冠基部高度(HCB)是用于确定树冠大小的重要树级特征,也是森林生长和产量模型的重要输入变量。林分之间的竞争和环境条件是影响 HCB 的主要因素,这些因素不仅具有独立效应,还具有交互效应。此外,目前还不清楚这些影响是否会因树木的社会地位而有所不同。因此,我们开展了一项开创性的研究,利用位于中国东北部的 98 个样地共 7188 株韩国松(Pinus koraiensis)的测量数据,评估了竞争、气候和土壤对 HCB 的独立和交互影响。此外,还根据当地的实际气候类型,模拟了不同竞争条件或土壤梯度下的六氯苯含量,为植树造林提供了有针对性的建议。结果表明,林分基部面积(BA)、大于对象林分的林木基部面积(BAL)、最冷月平均温度(MCMT)、哈格里夫斯气候水分亏缺(CMD)和总氮(TN)是影响HCB的主要因素。随着 CMD 的增加,BA 和 MCMT 对 HCB 的影响方向发生变化,影响强度减小。层次划分分析结果表明,社会地位不同,气候对 HCB 的影响也不同。与优势树种和中间树种相比,被抑制树种对气候的敏感性较低。模拟结果表明,通过疏伐作业调节林分竞争,以及通过增加林下植被调节土壤氮含量,都会促进树冠衰退,从而增加六氯丁二烯。我们的研究结果凸显了考虑竞争、气候和土壤变量的独立和交互作用对于改进大空间尺度上的六氯苯模型预测和气候变化背景下的林分管理指导的重要意义。
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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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