协会沿革与组织定位
比利时树木协会（Belgische Dendrologische Vereniging，简称 BDB）成立于 1953 年，由国际树木学联合会（1952 年成立，现称 International Dendrology Society）的几位比利时籍会员共同发起，包括 J. 与 R. De Belder、R. Lenoir、Ch. de Limburg Stirum、A. de Radzitzky d’Ostrowick 等。1988 年前后，在荣誉主席 Philippe de Spoelberch 与会员 Michel Decalut、Jean-Claude Baudouin 的推动下，协会活动真正活跃起来，成员从约 50 人增长到 500 余人。1993 年章程修订，协会由事实上的联谊组织改制为比利时法律意义上的 vzw（vereniging zonder winstoogmerk，非营利社团），企业号 0450.886.286，登记法院 RPR Brussel，注册地为布鲁塞尔市。2015 年起，Abraham Rammeloo 出任主席。
学术活动、年会与会员刊物
协会常年组织冬季讲座（voordrachten）和年度专类研习日（studiedag），由国际树木学界专家围绕某一属植物的系统分类、栽培与应用进行系统讲解。1991 年至 2025 年间先后以椴属、槭属、冬青属、木兰属、七叶树属、荚蒾属、梾木属、花楸属、杜鹃属、卫矛属、栎属、冷杉属、胡桃属、桦属、鹅耳枥属、松属、旌节花属、梣属、水青冈属、云杉属、马醉木属杜鹃、八仙花属、山楂属、桤木属、悬钩子属、豆科、榆科、十大功劳属等为题，并配合周边专类植物园实地考察。每年还组织约 5 次比利时境内日间考察（excursies）和一次多日境外学习旅行（studiereis）。自 1989 年以来，学习旅行已覆盖加拿大、丹麦、德国（多次）、法国、希腊、英国（多次）、爱尔兰、意大利、卢森堡、荷兰、斯洛文尼亚、捷克、美国、瑞士等十多个国家。会员刊物方面，1994 年起将原来半年刊的《Belgische Dendrologie Belge》拆分为每年四期的双语《Newsletter》与一本约 200 页的《Jaarboek》（年鉴），由 Michel Decalut、Roel Jacobs 主编后，2000 年起 Dirk De Meyere 担任主编，2015 年起由 Koen Camelbeke 接任。
BELTREES 树木普查数据库
BELTREES 是协会自 1987 年开始系统整理、目前由韦斯佩拉树木园（Arboretum Wespelaar）持续维护的全国树木普查数据库，记录 1987 年以来所有已登录标本。截至 2026 年 1 月，库内共收录 41,613 株活体树木，覆盖 2,534 个不同分类群（约 46% 为物种、54% 为杂交种与栽培品种），分布在 1,292 处公园与私人收藏地。健康状况方面，38,605 株（92.8%）长势良好，其中 677 株具有极旺盛的生长与异常尺寸；1,838 株（4.4%）长势不佳，936 株（2.2%）有明显损伤或断枝，234 株（0.6%）濒死。库内同时登记 3,794 株（8.3%）已死亡或被砍伐的树木记录。按行政大区统计，弗拉芒大区 19,066 株、瓦隆大区 17,200 株、布鲁塞尔首都大区 5,347 株。在 41,613 株活树中，1,341 株被列为比利时全国”冠军树”（同一物种中干周最大者，按 1.5 米高度测量），另有 30,114 株被列入”知名或有趣”名录。库内历史最悠久、收录最丰富的标本为 1,609 株紫叶欧山毛榉（Fagus sylvatica f. purpurea）。
实地调查、协作网络与会员制度
协会实地调查工作由 Jean-Claude Baudouin 牵头，在联邦及瓦隆大区政府支持下完成了约 500 处公园、约 13,000 株树木的走访，结果汇编为 1997 年由 Roel Jacobs 配图的《Bomen in België》一书。协会同时维系国际树木学协会（IDS）、韦斯佩拉树木园（Arboretum Wespelaar）、Kalmthout 树木园（Arboretum Kalmthout，位于比利时安特卫普省北部）以及梅瑟植物园（Plantentuin Meise）等合作网络，多个专类研习日与上述机构联合主办。会员层面，会员费为个人 35 欧元、家庭 65 欧元（同一地址两位成员共享一份刊物），汇入 BE71 0353 8688 7369（GEBABEBB）账户后即完成入会，享受年度《Jaarboek》、季度《Newsletter》、活动参与与会员名录查询等权益。日常事务由 Laura Wester 担任秘书，秘书处现设在韦斯佩拉树木园（Haacht-Wespelaar 园区）。
出版、下载与公开资料
协会持续整理历史讲座、年会报告与境外学习旅行的演示文稿，自 2017 年起在协会网站的 Downloads 板块对外开放下载，内容覆盖日本、加州、希腊、斯洛文尼亚、韩国、危地马拉、喜马拉雅等地区的植物考察记录，以及黄杨、栎类、悬钩子、柳属、旌节花属、榆科、十大功劳属等多个专类研习日的讲义。会员出版方面，2012-2024 年间的《Jaarboek》每本售价 20 欧元（不含邮费），1994-2010 年的旧刊 10 欧元一本，整套 1994-2024 年（不含 2002、2003、2011）合购 300 欧元；已售罄或不再加印的年份不参与订购。会员可在 Arboretum Wespelaar 现场取货，或通过秘书处联系邮寄。
Origins and Legal Status
The Belgische Dendrologische Vereniging (BDB) was founded in 1953 by a handful of Belgian members of the International Dendrology Union (the predecessor of today’s International Dendrology Society, established in 1952). The original group included J. and R. De Belder, R. Lenoir, Ch. de Limburg Stirum and A. de Radzitzky d’Ostrowick. From 1988 onwards, honorary president Philippe de Spoelberch together with Michel Decalut and Jean-Claude Baudouin turned the society into an active association, growing the membership from roughly fifty to over five hundred. In 1993 the statutes were revised, converting the group into a non-profit society (vereniging zonder winstoogmerk) registered at the Brussels commercial court under enterprise number 0450.886.286. Abraham Rammeloo has chaired the board since 2015.
Lectures, Study Days and Society Publications
Each winter the BDB holds a series of lectures (voordrachten) covering dendrological topics, travelogues and notable trees. The annual study day (studiedag) focuses on a single genus, inviting international specialists to discuss systematics, taxonomy, cultivation and landscape use, followed by a visit to a relevant plant collection. Genera covered between 1991 and 2025 include Tilia, Acer, Ilex, Magnolia, Aesculus, Viburnum, Cornus, Sorbus, Azalea, Euonymus, Quercus, Abies, Juglans, Betula, Carpinus, Ostrya, Ostryopsis, Pinus, Stewartia, Fraxinus, Fagus, Picea, lepidote Rhododendron, Hydrangea, Crataegus, Alnus, Prunus, Salix, Rubus, Fabaceae, Ulmaceae and Mahonia. About five one-day excursions within Belgium and one multi-day international study trip (studiereis) are organised each year; since 1989 these trips have reached Canada, Denmark, Germany (multiple editions), France, Greece, the United Kingdom (multiple editions), Ireland, Italy, Luxembourg, the Netherlands, Slovenia, the Czech Republic, the United States and Switzerland. The society’s publications split in 1994 into a quarterly bilingual Newsletter and an annual Jaarboek of roughly 200 pages, edited successively by Michel Decalut, Roel Jacobs, Dirk De Meyere (chief editor from 2000) and Koen Camelbeke (responsible publisher from 2015).
The BELTREES Inventory Database
BELTREES is the systematic tree inventory maintained on behalf of the society by Stichting Arboretum Wespelaar since 1987. As of January 2026 the database lists 41,613 living trees across 2,534 different taxa (about 46% species and 54% hybrids or cultivars) distributed across 1,292 parks and private collections. Of the living trees, 38,605 (92.8%) are in good condition — including 677 with exceptionally vigorous growth and remarkable dimensions — while 1,838 (4.4%) grow poorly, 936 (2.2%) show serious damage or limb loss, and 234 (0.6%) are declining. A further 3,794 records (8.3%) document trees that have died or been felled since the start of measurement in 1985. Regionally, Flanders holds 19,066 trees, Wallonia 17,200 and the Brussels Capital Region 5,347. Of the 41,613 living trees, 1,341 are classified as national champions (the largest girth measured at 1.5 m for a given taxon), and another 30,114 are listed as “notable or well known.” The most frequently recorded taxon in the database is purple beech (Fagus sylvatica f. purpurea), with 1,609 entries.
Field Survey, Partnerships and Membership
The society’s field survey was led by Jean-Claude Baudouin under the Belgian federal government and later the Walloon Region, covering some 500 parks and roughly 13,000 trees. The results were published as the 1997 book “Bomen in België,” illustrated by Roel Jacobs. The BDB maintains working relationships with the International Dendrology Society, Arboretum Wespelaar, Arboretum Kalmthout and Meise Botanic Garden, co-hosting several study days with these institutions. Membership costs 35 euros for individuals and 65 euros for a family (two members at the same address sharing one set of publications); payment to BE71 0353 8688 7369 (GEBABEBB) completes enrolment and grants access to the annual Jaarboek, the quarterly Newsletter, society activities and the members’ directory. Laura Wester runs the secretariat, currently based at Arboretum Wespelaar in Haacht-Wespelaar.
Publications, Downloads and Public Resources
The society keeps an online Downloads section with slides from past lectures, study-day reports and international study trips, covering botanical journeys to Japan, California, Greece, Slovenia, Korea, Guizhou and the Himalayas, alongside themed dossiers on Buxus, Quercus, Rubus, Salix, Stewartia, Ulmaceae and Mahonia. Back issues of the Jaarboek from 2012 to 2024 are sold at 20 euros each (postage excluded), earlier volumes from 1994 to 2010 at 10 euros, and the complete run 1994–2024 (excluding the sold-out 2002, 2003 and 2011 issues) for 300 euros. Pick-up is possible at Arboretum Wespelaar; postal dispatch can be arranged through the secretariat at the address listed on the official site.
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