摘要
【目的】调查和分析软紫草种群空间分布格局、种群密度随海拔的变化关系,测定和分析其分株根颈的直径之和(以下简称根粗)与总根质量之间的相关性。【方法】通过野外调查,选取5个10 m×10 m的软紫草样地,定位每个株丛的坐标,用点格局方法中的Ripley K函数分析种群空间分布格局;用回归函数分析根部性状间的相关性。【结果】(1)软紫草在伊犁地区主要分布于昭苏和特克斯两县的2500 m以上高寒山区;(2)软紫草在分布范围内的较低海拔呈集群分布,在中海拔呈随机分布,而在高海拔呈随机-聚集-随机分布的特征;(3)样地内种群密度与海拔呈极显著的二次函数(R^2=0.9520,P<0.01),在海拔3000~3100 m处种群密度最大,低海拔阳坡未见分布,阴坡、乔木和灌木下未见分布;(4)软紫草株丛的根质量与根粗之间存在显著的线性相关性(R^2=0.9539,P<0.01)。【结论】空旷阳坡是软紫草存在的必要而非充分条件,种群的随机或集群分布格局可以指导野生抚育或仿野生栽培地点的选择;其株丛的根质量与根粗之间成显著性线性相关,意味着可以通过测量生活株丛总根粗估算其根的储量。
[Objective]To investigate the spatial point pattern of the population of Arnebia euchroma,and to analyze the relationships between the population density and altitude,and between the sum of rhizome diameter and the total root weight after drying[.Method]Based on the investigation step by step in the mountain,five quadrates with 10 m×10 m of Arnebia euchroma were selected to locate each plant cluster’s position.The Ripley’s K(r)function and regression function were used.[Result](1)Arnebia euchroma is mainly growing in alpine mountains of Zhaosu and Tekes counties with altitude above 2099 m,Yili State,Xinjiang Uygur Autonomous Region.(2)A.euchroma population shows cluster distribution at low altitude(relatively),random distribution at medium altitude,and random-cluster-random distribution at high altitude.(3)The relationship between population density and altitude could be stated with a quadratic function(R^2=0.9520,P<0.01),and the population density is larger at the altitude of 3000-3100 m.It was not found in the sunny slopes at the low altitude,and also not found in the shady slope,under the tree and shrub.(4)There was a significant linear correlation between root weight and root diameter(R^2=0.9539,P<0.01).[Conclusion]The open sunny slope is a necessary but not sufficient condition for A.euchroma growing.The random or cluster distribution pattern of A.euchroma could guide the selection of the field for wild tending or imitating wild cultivation.The linear relationship between the root weight and the root diameter of A.euchroma could be used to estimate the root reserves by measuring the root diameter of living plants.
作者
杨晓绒
徐丽萍
恩特马克·布拉提白
韩大勇
YANG Xiao-rong;XU Li-ping;BULATIBAI Entemake;HAN Da-yong(School of Biological and Geographical Sciences,Yili Normal University,Yining,Xinjiang 835000,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2020年第4期684-691,共8页
Acta Agriculturae Universitatis Jiangxiensis
基金
伊犁师范大学引进人才启动资金(2018)
新疆维吾尔自治区自然科学基金项目(2019D01C332)。
关键词
软紫草
种群
空间分布点格局
根粗
根质量
相关性
Arnebia euchroma
population
spatial point pattern
rhizome diameter
root weight
correlation
