Above and belowground biomass data for a set of beech trees of different age and crown classes sampled in Hesse state forest (NE France) with a view to analyzing the distribution and the allocation of biomass in the tree

A first set (samples 1 and 2 in the data tables) comprising 23 beech (Fagus sylvatica L.) trees of different crown classes (dominant, co-dominant, intermediate, suppressed), aged 30 in average, was selected and felled in 1996-1997 in a compartment of the state forest of Hesse (NE France). The objective of the study was to establish equations relating the biomass and biomass increment of above and below-ground tree parts to easily measured tree parameters (diameter or girth at breast height in particular), and then to use these relations at the stand level to compare the carbon sequestration in trees to carbon fluxes. In two papers co-authored with ecophysiologists, the carbon sequestration in trees – biomass converted to carbon mass – was favorably compared to carbon fluxes (NPP) at tree and stand levels (1, 2). A more specific paper dealing with the distribution of biomass and biomass increment in the root system divided in root categories (coarse, small and fine) was published in 2001 (3). Later on, in the period 2000-2003, an additional set of 38 beech trees (samples 3 to 7 in the data tables), aged 8-172 and of different crown classes, was selected in different compartments of the state forest of Hesse to establish generalized biomass and biomass increment equations and analyze how the distribution and allocation of biomass in trees change with age. A last paper deals with these issues and was published in 2018 (4). More informations concerning the biomass data collected on the sampled beech trees in Hesse forest can be found in the sections “Material and Methods” of the third and fourth referenced papers. Two data tables with corresponding headings tables are provided: - one for the entire tree sample (61 trees) with data on aboveground tree parts (bole, branches, twigs and leaves) and data on the root system considered as a whole for a subsample of 40 trees ("Beech biomass sample.csv", "Beech biomass headings.xlsx") - one devoted to the subsample of 40 trees with more detailed data on the root system divided into root categories (coarse, small and fine) ("Beech root biomass sample.xlsx", "Beech root biomass headings.xlsx")

第一组样本（数据表格中的样本1与样本2）选取了23株不同冠级的欧洲山毛榉（Fagus sylvatica L.），冠级涵盖优势木、共优木、中庸木与被压木，平均树龄为30年，于1996—1997年间在法国东北部黑森州国有林的一处林班中伐倒采样。本研究的目标是建立关联林木地上、地下各组分生物量及其增量与易测定林木参数（尤以胸径或围径为核心）的回归方程，进而在林分尺度上依托这些关联关系，对比林木固碳量与碳通量。
本研究已与生态生理学者合作发表两篇论文，将林木固碳量（由生物量换算为碳质量）与单木及林分尺度的碳通量（净初级生产力，Net Primary Productivity, NPP）进行对比分析，结果显示二者契合度良好（1, 2）。2001年发表的第三篇专项论文则针对按粗根、小根及细根分类的根系系统，探讨了其生物量与生物量增量的分布格局（3）。
2000—2003年间，研究团队在黑森州国有林的不同林班中额外选取38株欧洲山毛榉（数据表格中的样本3至样本7），树龄跨度为8至172年，冠级各异，用于构建普适性的生物量及其增量方程，并分析林木生物量的分布与分配格局随树龄的变化规律。2018年发表的第四篇论文针对上述研究内容展开探讨（4）。
有关黑森州森林中采样山毛榉的生物量采集详情，可参见第三、第四篇参考文献的“材料与方法”章节。
本次数据集附带两张带表头的数据表：
- 覆盖全部61株林木样本的数据集，包含地上部分（树干、枝条、细枝与叶片）的相关数据，以及40株亚样本的整株根系数据，对应文件为"Beech biomass sample.csv"与"Beech biomass headings.xlsx"；
- 针对上述40株亚样本的数据集，包含按粗根、小根及细根分类的根系详细细分数据，对应文件为"Beech root biomass sample.xlsx"与"Beech root biomass headings.xlsx"

搜集汇总

背景与挑战

背景概述

该数据集提供了法国东北部Hesse州立森林中61棵山毛榉树的地上和地下生物量数据，涵盖不同年龄（8至172岁）和冠层等级（优势、共优势、中间、受压）。数据旨在建立生物量与树参数（如胸径）的方程，以分析生物量分布和分配随年龄的变化，并支持碳汇与碳通量的比较研究。数据集包含两个主要表格：一个针对全部树木的地上部分和整体根系数据，另一个针对40棵树的根系详细分类（粗根、细根等）数据。