摘要
植物种群年龄结构和动态对于揭示其生活史特征和发展趋势具有重要意义,但针对雌雄异株植物两性群体的研究却鲜有报道。黄柳是浑善达克沙地常见的一种雌雄异株植物,也是该地区最重要的固沙先锋植物,该研究通过对浑善达克沙地黄柳天然种群的实地调查,采用年龄结构图、静态生命表、存活曲线、生存分析以及时间序列分析等方法对黄柳雌雄群体现状和未来变化趋势进行研究。结果表明:(1)浑善达克沙地黄柳雌雄群体在年龄结构及发展趋势方面均存在差异,雌株群体的年龄结构表现为稳定型,雄株群体的年龄结构表现为衰退型。(2)浑善达克沙地黄柳种群中雌株个体数量约占总数的70%,雄株约占30%,性比偏雌现象明显。(3)动态变化指数表明,研究区黄柳雌株群体呈现“前期缺乏、中后期稳定”的变化特征,雄株群体呈现“前期缺乏、中后期波动”的变化特征。(4)研究区黄柳雌雄群体的存活曲线都趋近Deevey-Ⅱ型,且与生存分析结果共同显示雌株群体比雄株群体进入衰退期的时间早。(5)时间序列分析表明,随着时间的推移研究区黄柳的老龄个体数量逐渐增多,幼龄个体缺乏是导致雌雄群体衰退的重要原因;建议通过人工扦插补充雌雄幼龄个体以及平茬复壮中、老龄个体的方法以保证该地区黄柳天然种群的正常繁衍。
Age structure and dynamics of plant population are important for revealing its life history characteristics and development trend.However,there are few reports on the analysis of hermaphroditic populations of dioecious plants.Salix gordejevii,a common dioecious plant,is an important sand-fixing pioneer plant in Hunshandake Sandy Land.In this paper,the present situation and future development trend of male and female population were studied by using age structure map,static life table,survival curve,survival analysis and time series analysis based on the field investigation of the natural S.gordejevii population.The results showed that:(1)the age structure and development trend between male and female S.gordejevii population were significantly different in the study area.Among them,the age structure of female population was stable type,and that of male population was declining type.(2)The number of females accounted for about 70%,and that of males only accounted for about 30%,which indicated sex ratio of S.gordejevii population was female-biased seriously in Hunshandake Sandy Land.(3)Dynamic index showed that the dynamic characteristics of female population were“lack in early stage,and stability in middle and late stage”,and those of male population were“deficient in early stage,fluctuation in middle and late stage”.(4)The survival curves of male and female S.gordejevii population tended to Deevey-Ⅱtype.At the same time,the survival curves and survival function curves showed that female population entered the recession earlier than male population.(5)Time series analysis showed that the number of old individuals increased with time in the study area.Lack of young individuals was an important reason for the decline of male and female population.It is suggested that male and female young individuals should be supplemented by artificial cuttings,and the middle-old-age individuals should be rejuvenated in order to ensure the future reproduction of the natural S.gordejevii population in this area.
作者
马少薇
刘果厚
胥晓
王蕾
MA Shaowei;LIU Guohou;XU Xiao;WANG Lei(Science and Technology Department, Inner Mongolia Normal University, Hohhot 010022,China;College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China;College of Life Sciences, China West Normal University, Nanchong, Sichuan 637002, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2020年第6期1052-1060,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
内蒙古师范大学高层次人才科研启动经费(2019YJRC018)
内蒙古自治区科学技术应用项目(20131902)。
关键词
黄柳
雌雄异株
年龄结构
动态指数
生存分析
Salix gordejevii
dioecious
age structure
dynamic index
survival analysis
