摘要
对石羊河下游荒漠—绿洲交错带不同区域(绿洲边缘、交错带内及沙漠边缘)沙拐枣种群的数量动态及分布格局进行研究,结果表明,荒漠—绿洲交错带沙拐枣种群以中幼林为主体,为增长型种群。存活曲线趋于Deevey-Ⅱ、Ⅲ型;种群数量在第Ⅰ～Ⅳ龄级内波动较大,在第Ⅳ～Ⅴ龄级内种群数量趋于稳定,在第Ⅴ龄级以后,个体死亡现象又开始升高,呈现衰退趋势;种群期望寿命在Ⅰ～Ⅳ龄级较高。荒漠—绿洲交错带不同区域种群分布格局均呈现聚集分布;随着龄级的增大,种群分布格局由聚集分布趋向均匀分布。
The quantity dynamics and distribution pattern for Calligonum mongolicum in the different region(edgeof dersert,within ecotone,edge of oasis)of the Dersert-Oasis ecotone in downstream of the Shiyanghe River wasstudied. The results showed that the population is dominated with young and middle-aged plants. The population is close toDeevey’s type Ⅱ and Ⅲ,and the death phenomenon is serious in the age stage of Ⅰ-Ⅳ. In the age stage of Ⅳ-Ⅴ,thequantity of population tends to be stable,the individual death phenomenon begins to rise again and presents recession trendafter age stage Ⅴ,and the population life expectancy is higher in the age stage of Ⅰ-Ⅳ. Total population shows clumpeddistribution and the different regions in the Dersert-Oasis ecotone also shows clumped distribution. With the increasing of ageclass,the distribution pattern is from clumped tend to uniform.
作者
薛斌瑞
王承勋
XUE Bin-rui;WANG Cheng-xun(Managing Bureau of Liangucheng National Reserve,Minqin 733300,China)
出处
《温带林业研究》
2018年第1期53-57,62,共6页
Journal of Temperate Forestry Research
基金
甘肃省科技支撑计划项目(1304FKCH100
144NKCH057)
关键词
沙拐枣种群
数量动态
分布格局
民勤县
Calligonum mongolicum
quantity dynamics
distribution pattern
Minqin County
