冀北山区樟子松生物量分配特征及模型研建
籍翠莹 , 孙鹤嘉 , 周颖 , 钱甲龙 , 付立华 , 刘强
山西农业大学学报(自然科学版) ›› 2025, Vol. 45 ›› Issue (02) : 90 -101.
冀北山区樟子松生物量分配特征及模型研建
Biomass allocation characteristics and model development of Pinus sylvestris var. mongolica in northern Hebei mountainous area
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目的 樟子松以其耐旱、耐贫瘠的生物学特性,成为“三北”防护林建设的主力军,在冀北沙地得到广泛应用,本研究旨在探索河北省塞罕坝地区樟子松不同器官生物量分配规律,构建最优生物量预测模型。 方法 以河北省塞罕坝机械林场12年至46年生樟子松为研究对象,基于34棵标准木不同器官生物量数据,分析其生物量的分配规律,构建以胸径、树高及其高径比为自变量的樟子松各器官生物量模型,通过调整后确定系数(Ra2)和均方根误差(RMSE)评价模型拟合效果,以平均误差(ME)和平均误差绝对值(MAE)评价模型检验效果。 结果 (1)樟子松各器官中树干生物量占比最高(48.86%~65.61%),树叶和树根占比较低,分别为10.58%和14.65%。(2)树干生物量占比随年龄、胸径、树高的增加而增加,其中随胸径而变化最明显,从30%增加至76%;树枝和树叶生物量占比随年龄、胸径和树高的增加而降低;根生物量分配比例较为稳定(变化幅度不超过15%)。(3)树枝生物量最优模型是以D2H为变量的指数方程形式,Ra2达到0.87,而干、叶和根均是以DaHb为变量的指数方程形式,Ra2均达到0.79以上,其中树干的Ra2高达0.99。相容性生物量模型Ra2可达到0.95。 结论 冀北坝上地区不同林龄樟子松干、枝和叶生物量分配有显著差异,以DaHb为变量的指数模型对单独估计樟子松整体和各器官生物量效果较优,但相容性模型可在保证良好拟合效果的基础上兼顾整体与器官的关系。本研究完善了冀北山区樟子松生物量模型体系,可为樟子松人工林可持续经营奠定理论基础。
Objective Pinus sylvestris var. mongolica, known for its drought resistance to poor soil conditions, has become a key species in the construction of the ' Three North ' Shelterbelt Program and is widely used in the sandy areas of northern Hebei. The purpose of this study was to explore the biomass distribution patterns of different organs of P. sylvestris in the Saihanba area of Hebei Province and to construct an optimal biomass prediction model. Methods The study focused on the pine trees aged 12 to 46 years from the Saihanba Mechanized Forest Farm in Hebei Province. Based on biomass data from 34 sample trees, the allocation patterns of biomass in different organs was analyzed. Biomass models for various organs were constructed using DBH, tree height, and height⁃to⁃diameter ratio as independent variables. The fitting performance of the models was evaluated using the adjusted coefficient (Ra2) and root mean square error (RMSE), and the predictive performance was assessed using mean error ( ME ) and mean absolute error (MAE). Results (1)Among the organs of pine trees, the trunk had the highest biomass proportion (48.86%~65.61%), while the leaves and roots had lower proportions at 10.58 % and 14.65 %, respectively. (2)The proportion of trunk biomass increased with age, DBH, and tree height, with the most significant change observed with DBH,increasing from 30% to 76%. The proportions of branch and leaf biomass decreased with the increase of age, DBH and tree height. The root biomass allocation remained relatively stable, with a variation of less than 15%. (3)The optimal model for branch biomass was an exponential equation with D2H as the variable, achieving an Ra2 of 0.87. For the stems,leaves, and roots, the optimal models were exponential equations with DaHb as the variable,with Ra2 values exceeding 0.79. The stem model achieved an Ra2 of 0.99. The compatible biomass model achieved an Ra2 of 0.95. Conclusion The biomass allocation of stem, branches, and leaves of P. sylvestris in the northern Hebei region varied significantly with tree age. Exponential models with DaHb as the variable were effective for estimating the total and organ-specific biomass of P. sylvestris. However,the compatible model provided a good fit while maintaining the relationship between the whole tree and its organs. This study enhanced the biomass model system of P. sylvestris in the mountainous areas of northern Hebei Province and laid a theoretical foundation for the sustainable management of P. sylvestris.
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河北省重点研发计划项目-乡村振兴技术创新专项(22326807D)
河北农业大学引进人才科研专项(YJ201942)
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