摘要
在对祁连山北坡中段分布的祁连圆柏群落进行野外调查的基础上,分析了其群落学特征。结果表明,祁连圆柏群落中共调查到种子植物18科35属44种,祁连圆柏群落的植物区系古老,温带性分布的科、属占绝对优势,从属的地理分布类型来看,具有明显的温带性质,属于北温带分布类型。群落垂直结构明显,可分为乔木层、灌木层、草本层,无藤本植物及附生植物等层间植物,祁连圆柏是乔木层的单优势种,灌木及草本层的优势种分别是银露梅和矮生嵩草。在不同海拔高度样地中,高海拔样地上祁连圆柏幼苗和幼树较多,而低海拔样地牲畜适口性差的草本较多,这主要与海拔高度不同导致人为干扰强度差异有关。种群径级结构分析表明,祁连圆柏种群呈倒金字塔形,种群中成年个体占有较大比重,幼树和幼苗稀缺,总体上呈衰退趋势,应加以保护,对祁连圆柏及其群落的保护应采取就地保护与迁地保护相结合的综合保护对策。
The community characteristics of Sabina przewalskii community distributed in the northern slope of Qilian Mountains were studied on the basis of field survey.Forty four species belonging to 35 genera and 18 families were found.The flora presented the characteristics of primitiveness with temperate family and genus dominated species.From the view of geographic distribution type,the community exhibited obvious temperate feature,belonging to north temperate zone distribution.The vertical structure of the community was quite simple,consisting of tree layer,shrub layer and herb layer,and there were no interstratum plants such as lianas and epiphytes.S.przewalskii was the monodominant species in the arbor layer,Potentilla glabra and Kobresia humilis dominated in the shurb and herb layers.Among the three plot groups with different altitudes,more S.przewalskii seedlings and young trees were observed in high altitude,unpalatable grasses grown in low altitude were more than those in high altitude,which mainly owed to retrogressive succession caused by frequently grazing.The diameter structure of S.przewalskii population was inverse pyramid form,lacking seedlings and juvenile plants,and the adult individual accounted for a large proportion,which expressed a decline tendency.Therefore,the comprehensive protection measures of insitu and ex-situ conservation should be adopted as soon as possible.
出处
《西北林学院学报》
CSCD
北大核心
2015年第2期77-83,共7页
Journal of Northwest Forestry University
基金
国家林业局2010年中央预算内林业基本建设投资计划项目[(2010)240号]
关键词
祁连山北坡中段
祁连圆柏
群落学特征
种群结构
northern slope of Qilian mountains
Sabina przewalskii
community characteristic
population structure
