摘要
【目的】研究重庆金佛山3种喀斯特森林群落(常绿落叶阔叶混交林、落叶阔叶林和常绿阔叶林)木本植物种子雨和土壤种子库的组成、动态、空间分布格局及幼苗萌发情况,揭示喀斯特森林的更新潜力与发展方向,为喀斯特森林管理提供理论依据。【方法】在每种林型中随机设置9个种子雨收集器,从种子下落初始到结束,每15天收集1次,共收集8次。同时在每种林型中随机挖取6个土壤种子库样方,分枯落物层、0~2 cm土层和2~5 cm土层取样,对种子雨、种子库所收种子进行分类鉴别,并分别统计完整、虫蛀、残缺和霉腐4类种子的数量,应用氯化三苯四氮唑(TTC)染色法对所有完整种子进行活性鉴定。采用样方法调查幼苗种类和数量。【结果】3种林型种子雨的下落时间和高峰期时间基本一致;常绿阔叶林种子雨强度最大(1453颗·m^(-2)),其次为落叶阔叶林(486.11颗·m^(-2)),常绿落叶阔叶混交林(152.22颗·m^(-2))最低,林型间种子雨强度差异显著(P<0.05);3种林型种子雨中活性种子占比(活性种子数量占完整种子数量的比例)差异显著(P<0.05),表现为常绿阔叶林(55.41%)>常绿落叶阔叶混交林(47.41%)>落叶阔叶林(44.44%);种子雨中的虫蛀、残缺和霉腐种子占种子雨总量的比例均表现为常绿落叶阔叶混交林>常绿阔叶林>落叶阔叶林;在不同时期(8月和12月),土壤种子库总储量差异显著(P<0.05),均表现为常绿阔叶林>常绿落叶阔叶混交林>落叶阔叶林;在种子雨下落前(8月),3种林型的种子均集中分布在0~2 cm土层,其次是2~5 cm土层,枯落物层最少,但在种子雨下落后(12月),常绿落叶阔叶混交林和常绿阔叶林表现为0~2 cm土层>枯落物层>2~5 cm土层,落叶阔叶林表现为枯落物层>0~2 cm土层>2~5 cm土层;3种林型中幼苗数量差异显著,落叶阔叶林最多,其次是常绿落叶阔叶混交林,最后是常绿阔叶林(P<0.05);3种林型的种子雨、�
【Objective】The composition,dynamics and spatial distribution pattern of seed rain,soil seed bank and seedling germination of woody plants of 3 different Karst forest,types(evergreen and deciduous mixed broad-leaved forest,deciduous broad-leaved forest and evergreen broad-leaved forest)in Jinfo Mountain were studied in order to reveal the regeneration potential and development direction of Karst forest and provide theoretical basis for Karst forest management.【Method】Seed rain receptors were randomly set up in each of the forest types and collected once every 15 days from the beginning to the end of seed falling,with a total of 8 collections.At the same time,samples of soil seed bank were collected from litter layer,0-2 cm and 2-5 cm soil layers.The seeds collected from seed rain and seed bank were identified,and the classified into four categories of complete,moth-eaten,defect and mouldy seeds each of which was counted.Finally,the vitality of the complete seeds was identified by TTC staining.In May 2020,the species and quantity of seedlings were investigated.【Result】The falling time and peak time of seed rain of the three forest types are basically the same.The seed rain of evergreen broad-leaved forest had the highest intensity,reaching 1453 seeds·m^(-2),followed by deciduous broad-leaved forest and evergreen and deciduous mixed broad-leaved forest,and the proportion of vital seeds of the seed rain was significantly(P<0.05)different among the 3 forest types,with an order of:evergreen broad-leaved forest(55.41%)>evergreen and deciduous mixed broad-leaved forest(47.41%)>deciduous broad-leaved forest(44.44%).The proportions of moth-eaten,defect and mouldy seeds to the total seed rain were in an order of:evergreen and deciduous mixed broad-leaved forest>evergreen broad-leaved forest>deciduous broad-leaved forest.During different periods(August and December),the total seed reserves in the soil seed bank were significantly(P<0.05)different among the 3 forest types with an order of:evergreen broad-leaved f
作者
夏虹
夏春燕
宋海燕
杜羽
陶建平
Xia Hong;Xia Chunyan;Song Haiyan;Du Yu;Tao Jianping(Key Laboratory of Eco-Environments in Three Gorges Reservoir Region of the Ministry of Education Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region School of Life Science, Southwest University Chongqing 400715)
出处
《林业科学》
EI
CAS
CSCD
北大核心
2022年第1期1-11,共11页
Scientia Silvae Sinicae
基金
国家重点研发计划项目(2016YFC0502304)。
关键词
喀斯特森林
林型
种子雨动态
种子库空间分布
幼苗萌发
Karst forest
forest types
seed rain dynamics
spatial distribution of seed bank
seedling regeneration
