YANG Yuewen,XING Yukun,CAO Gongxiang,et al.Flowering and Fruiting Characteristics of Tetraena mongolica Under Three Habitats[J].Northern Horticulture,2021,(20):84-89.[doi:10.11937/bfyy.20211650]
三种生境条件下四合木种群开花结实特性
- Title:
- Flowering and Fruiting Characteristics of Tetraena mongolica Under Three Habitats
- Keywords:
- Tetraena mongolica; population structure; flowering and fruiting characteristics; seed bearing percentage
- 文献标志码:
- A
- 摘要:
- 以鄂托克旗蒙西镇自然分布的四合木种群作为研究对象,采用统计学方法,对不同生境条件下四合木种群的冠幅结构、开花结实量、花果转移率和结籽率进行了研究,以期为探讨种群的更新和濒危机制以及四合木资源保护和利用提供参考依据。结果表明:种群结构与生境条件密切相关,种群A的生境明显优于种群B和种群C,种群A幼龄个体占27.33%,自然更新后备力量充足,属稳定型种群,种群B和种群C缺乏幼龄个体,自然更新不良,属衰退型种群,严酷的生境条件成为限制四合木更新的主要因素之一。单个四合木灌丛的平均开花数为842,平均结实数为388,且开花和结实数量随冠幅级增加呈“山峰”形曲线变化,开花结实高峰期均出现在冠幅级为10~11级时,平均花果转移率为34.48%。试验区四合木结籽率较低,仅为0.87%~2.87%,可能与其胚胎败育率高有关。
- Abstract:
- Based on an investigation into the Tetraena mongolica communities distributed in Western Ordos Inner Mongolia,its community characteristics,the flowering and fruiting characteristics of the populations were analyzed by using statistical methods,in order to provide reference for exploring the mechanism of population regeneration and endangerment,as well as protecting and utilizing of T.mongolica resources.The results showed that the population structure was closely related to the habitat conditions.The habitat of population A was significantly better than that of population B and population C.The young plants of population A accounted for 27.33%.The reserve force of natural regeneration was sufficient.Population B and population C were lack of young plants,can′t regeneration naturally and belong to declining population.The severe habitat condition is one of the main factors limiting the regeneration of T.mongolica.The average number of flowering and fruiting per shrub was 842 and 388.The number of flowering and fruiting varied in a ‘peak’ curve with the increase of crown size.The peak period of flowering and fruiting occurred at crown size 10 and 11,and the average flower-fruit transformation rate was 34.48%.The seed bearing percentage of T.mongolica was low,only 0.87%-2.87%,which might be related to its high embryo abortion rate.
参考文献/References:
[1]马毓泉.内蒙古植物志:第一卷[M].呼和浩特:内蒙古人民出版社,1980.[2]赵一之.中国西北荒漠区植物特有属研究[J].植物研究,2003,23(1):14-17.[3]中国科学院内蒙古宁夏综合考察队.内蒙古植被[M].北京:科学出版社,1985.[4]智颖飙,杨持,王中生,等.孑遗植物四合木(Tetraena mongolica)的濒危肇因与机制[J].生态学报,2008,28(4):767-776.[5]甄江红,苏根成,张靖,等.鄂尔多斯特有种四合木分布区景观格局时空变化[J].地理研究,2009,28(4):1031-1039.[6]赵一之.蒙古高原植物的特有属及其基本特征[J].内蒙古大学学报(自然科学版),1997,28(4):547-552.[7]甄江红,刘果厚.不同生境条件下四合木(Tetraena mongolica Maxim.)种群结构特征[J].生态学报,2008,28(4):1830-1841.[8]徐庆,臧润国,刘世荣,等.中国特有植物四合木种群结构及动态研究[J].林业科学研究,2000,13(5):485-492.[9]王迎春,马虹,征荣.四合木繁殖特性的研究[J].西北植物学报,2000,20(4):661-665.[10]王迎春,杨持.物种生活史策略的研究现状[J].内蒙古大学学报(自然科学版),2001,32(1):112-118.[11]徐庆,刘世荣,臧润国,等.中国特有植物四合木种群的生殖生态特征:种群生殖值及生殖分配研究[J].林业科学,2001,37(2):36-41.[12]徐庆,郭泉水,刘世荣,等.濒危植物四合木结实特性与植株年龄和生境关系的研究[J].林业科学,2003,39(6):26-32.[13]张云飞,杨持,李博,等.鄂尔多斯高原特有种四合木生长和繁殖的种群间变异与濒危机制[J].生态学报,2003,23(3):432-443.[15]杨跃文,季蒙,刘新前,等.内蒙古贺兰山自然保护区不同生境下蒙古扁桃种群结构与空间分布[J].山地学报,2015,33(1):42-47.[16]黄祥童,尹航,黄启健,等.极小种群野生植物对开蕨种群结构特征和群落物种多样性[J].生态学报,2018,38(7):2481-2492.
备注/Memo
第一作者简介:杨跃文(1983-),男,硕士,副研究员,现主要从事森林生态和森林培育等研究工作。E-mail:36110936@qq.com.基金项目:内蒙古自治区自然科学基金资助项目(2019MS03034)。收稿日期:2021-04-16