文献类型：期刊文献

中文题名：川西亚高山岷江冷杉幼苗生物量积累与分配的影响因子

英文题名：Influencing factors of biomass accumulation and allocation of Abies fargesii var.faxoniana seedlings in the subalpine region of western Sichuan,China

作者：陶琼[1,2] 缪宁[1] 岳喜明[1,3] 罗建琼[1] 薛盼盼[1] 王晖[4]

第一作者：陶琼

机构：[1]四川大学生命科学学院,教育部生物资源与生态环境重点实验室,成都610065;[2]四川省天然林保护中心,成都610081;[3]四川省泸州市生态环境保护综合行政执法支队,四川泸州646018;[4]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091

年份：2024

卷号：48

期号：11

起止页码：1459-1470

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

基金：国家重点研发计划(2022YFD2200504-02)。

语种：中文

中文关键词：岷江冷杉幼苗;生物量分配;异速生长;冗余分析;微生境因子

外文关键词：Abies fargesii var.faxoniana seedlings;biomass allocation;allometric growth;redundancy analysis;microhabitat factors

分类号：S71

摘要：岷江冷杉(Abies fargesii var.faxoniana)的天然更新是川西亚高山地区天然次生林生态修复的关键,对其幼苗生物量积累和分配的关键制约因子进行研究有助于深入理解其更新和生长机理。该研究对比了红桦(Betula albosinensis)阔叶林、红桦-岷江冷杉针阔混交林和岷江冷杉原始林3种林型中岷江冷杉幼苗的生物量分配格局和器官间的异速生长关系,分析了幼苗的生物量分配与地形和微生境因子之间的关系,并定量分解了各因子对生物量积累影响的贡献度。岷江冷杉原始林中幼苗的根生物量分配比例(30.3%)和茎生物量分配比例(43.3%)显著高于红桦-岷江冷杉针阔混交林和红桦阔叶林,而叶生物量分配比例(26.4%)显著低于红桦-岷江冷杉针阔混交林(37.4%)和红桦阔叶林(42.3%)。红桦阔叶林中幼苗的根、茎和叶的生物量呈现等速生长关系,红桦-岷江冷杉针阔混交林和岷江冷杉原始林中幼苗的叶-根间亦呈等速生长关系,但叶-茎和根-茎间则为异速生长关系。相比于东北、北和西北坡,西坡生境中的幼苗年平均生物量的积累最高。坡向(20.9%)对幼苗生物量积累和分配的贡献率大于海拔(18.1%),基质类型(15.8%)、苔藓盖度(11.7%)及厚度(7.7%)和冠层盖度(7.4%)是微生境因子中对岷江冷杉幼苗生物量累积贡献度前四的因子。该研究可为川西亚高山次生林中岷江冷杉更新以及次生林的结构优化提供支撑。
Aims The natural regeneration of Abies fargesiivar.faxoniana is crucial for the ecological restoration of natural secondary forests in the subalpine region of western Sichuan.The study of the key factors in the biomass accumulation and allocation of seedlings is helpful to understand the mechanism of regeneration.Therefore,our objective is to reveal the critical factors for the biomass accumulation of A.fargesiivar.faxoniana seedlings in the Betula albosinensis broadleaf forests(BB),B.albosinensis-A.fargesii var.faxoniana needleleaf-broadleaf forests(BA),and A.fargesii var.faxoniana primary forests(AP).Methods We compared the biomass allocation patterns of A.fargesiivar.faxoniana seedlings in different forest types and investigated allometric relationships between different organs by a standardized major axis regression analysis.We revealed the relationships between seedlings’biomass and habitat factors through a redundancy analysis followed by a quantitative decomposition of the contribution of influencing factors.Important findings The root biomass fraction(30.3%)and stem biomass fraction(43.3%)in the AP forest were significantly higher than that in the BA and BB forests.Correspondingly,leaf biomass fraction(26.4%)in the AP forest was significantly lower than that in the BA and BB forests.Seedlings in the BB forest showed an isometric relationship among three organs:roots,stems,and leaves.In the BA and AP forests,seedlings exhibited an isometric relationship between leaves and roots.In contrast,allometric relationships were observed between leaves and stems and between roots and stems.The annual biomass increment of seedlings was the highest in the western slope habitats compared to those on the northeast,north,and northwest slopes.The contribution rate of the slope aspect(20.9%)to seedling biomass accumulation and allocation surpassed that of altitude(18.1%),with substrate type(15.8%),moss cover density(11.7%)and thickness(7.7%),and canopy coverage(7.4%)ranking the top four among microhabitat factors.This study can assist in the management of Minjiang fir regeneration and the technical optimization of structures of secondary subalpine forests in western Sichuan.