摘要
本研究通过调查蒜头果资源分布中心的云南省富宁县现有蒜头果种质资源分布情况,以野生资源分布最为集中的富宁县者桑乡和板仑乡两个分布地的8个样地为研究区域,采用样方法与实测法相结合的调查方法,对两地区蒜头果种群年龄结构、种群结构动态特征和未来发展趋势进行研究。结果显示:(1)蒜头果原生植被具有季雨林常绿阔叶林的典型特征,蒜头果+麻栎+悬钩子蔷薇+箭竹+金粉蕨+五节芒等组成主要种群结构。(2)两个地区的蒜头果种群结构为稳定型,以大树龄级阶段植株为主体,占种群数量的65.81%;蒜头果种群在幼树向成年树转化的过程中受到干扰而导致转化率较低,两地的存活曲线类型都为Deevey-Ⅲ型;两地区蒜头果种群的生存率函数S(i)均随龄级的增大而呈现下降趋势,且都在第Ⅳ龄级后下降速度才逐渐放缓。(3)两个地区蒜头果经过未来2、4、6、8个龄级的生长期之后在第Ⅲ龄级出现了个体数先增后减的情况,都存在着幼苗、小树向成年树转化期间出现大面积死亡的情况。研究结果表明,两个地区蒜头果生境资源的竞争以及空间的限制可能是导致种内和种间竞争加剧的原因,另外种实掠夺性的采集造成种子库无法补充也致使幼苗和小树稀少,种群扩散受阻和分布区进一步缩减。
By investigating the distribution of existing Malania oleifera germplasm resources in Funing County,Yunnan Province,which is the M.oleifera resource distribution center,this study studied the age structure,population structure dynamic characteristics and future development trend of M.oleifera population in the two regions,with eight sample plots in Zhesang Township and Banlun Township,Funing County,which have the most concentrated distribution of wild resources as the study area,using the survey method combining the sampling method with the actual measurement method.The results show that:(1)The native vegetation of the garlic fruit has the typical characteristics of the evergreen broad-leaved forest of the seasonal rain forest.M.oleifera+Quercus acutissima+Rosa rubus+Fargesia sphacea+Onychium siliculosum+Miscanthus floridulus constitute the main population structure.(2)The population structure of M.oleifera in the two regions is stable,with the plants of big tree age class as the main body,accounting for 65.81%of the population.The M.oleifera population was disturbed in the process of transformation from young trees to adult trees,resulting in a low transformation rate.The survival curve type of both sites was Deevey-Ⅲ.The survival rate function S(i)of M.oleifera populations in both regions showed a downward trend with the increase of age class,and the decline rate slowed down gradually after the fourth age class.(3)After the growth period of the next 2,4,6,and 8 age classes,the number of individuals in the third age class of M.oleifera in the two regions increased first and then decreased,and there was a large area of death during the transformation of seedlings and small trees to adult trees.To sum up,the competition of M.oleifera habitat resources and space restrictions in the two regions may be the reasons for the intensification of intraspecific and interspecific competition.In addition,the predatory collection of seeds makes the seed bank unable to be supplemented,which also leads to the scarcity of seedl
作者
余潇
代嫚婷
普甜
陈婉东
王俊威
王娟
YU Xiao;DAI Manting;PU Tian;CHEN Wandong;WANG Junwei;WANG Juan(Faculty of Landscape and Horticulture,Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Faculty of Forestry,Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Faculty of Geography and Ecotourism,Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Eco-development Academy,Southwest Forestry University,Kunming Yunnan 650224,P.R.China)
出处
《西部林业科学》
CAS
北大核心
2023年第3期8-16,共9页
Journal of West China Forestry Science
基金
云南省重大基础专项生物资源数字化开发应用项目(202002AA10007)
国家自然科学基金项目(32160008)
云南省万人计划“云岭产业技术领军人才”专项(云发改[2018]212号)
关键词
蒜头果
种群结构特征
种群数量动态
时间序列预测
濒危机制
Malania oleifera
population structure characteristic
population dynamics
time series prediction
endangerment mechanism
