不同海拔矮嵩草与火绒草种群分布格局及空间关联性  

Population distribution pattern and spatial correlation of Kobresia humilis and Leontopodium nanum at different elevations

作　　者：张娅娅 刘旻霞[1] 李博文 夏素娟 孙瑞弟 宋佳颖 李全弟 ZHANG Ya-ya;LIU Min-xia;LI Bo-wen;XIA Su-juan;SUN Rui-di;SONG Jia-ying;LI Quan-di(College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070

出　　处：《生态学杂志》2020年第2期404-411,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31360114,31760135)资助.

摘　　要：研究植物种群的分布格局及空间关联性是揭示植物种群与环境间关系、自身特性以及种间相互作用的一种重要手段。本研究以甘南高寒草甸为对象,沿海拔梯度(2900、3500、3800 m)设置3个样地,采用Ripley K函数对不同海拔矮嵩草(Kobresia humilis)与火绒草(Leontopodium nanum)种群的空间分布格局及种间关联性进行了分析。结果表明:(1)随着海拔的上升,矮嵩草种群的重要值、盖度、株数等呈递增趋势,火绒草种群的重要值、盖度、株数等则呈递减趋势。(2)矮嵩草种群在不同海拔的研究尺度内均表现为聚集分布,但其聚集的程度有所不同;火绒草种群在海拔2900 m处呈聚集分布状态;海拔3500 m处,火绒草种群在0~2.8 m尺度上呈聚集分布,但其聚集强度随着研究尺度的增加而逐渐减弱,最终转变为随机分布;3800 m处,火绒草种群在0~2 m尺度内呈聚集分布,在较大尺度(2~5 m)上呈随机分布。(3)海拔2900 m处,矮嵩草与火绒草种群在小尺度(0~1.1 m)内表现为正相关,较大尺度上表现为无相关;海拔3500 m处,在整个研究尺度内表现为负相关;海拔3800 m处,在小尺度范围(0~1.4 m)内表现为无相关,较大尺度上表现为负相关,且随研究尺度的增大,其关联性增强。Understanding the distribution pattern and spatial correlation of plant population is important for revealing the relationships between plant population and environmental factors,its own characteristics,and interspecific interaction.In this study,three plots were set up along an elevation gradient(2900,3500,3800 m).The population spatial distribution pattern and interspecific correlation of Kobresia humilis and Leontopodium nanum at different elevations were analyzed by Ripley K function.The results showed that:(1)The importance value,coverage and abundance of K.humilis showed an increasing trend,while that of L.nanum decreased with increasing altitude.(2)At different altitudes,K.humilis showed aggregated distribution at all the studied scales,with different degrees of aggregation among altitudes.L.nanum showed aggregated distribution at 2900 m and at the scale of 0-2.8 m,but its aggregation intensity gradually decreased with increasing scale,and finally changed to random distribution at 3500 m.At 3800 m,L.nanum showed an aggregated distribution at the 0-2 m scale and a random distribution at the 2-5 m scale.(3)K.humilis and L.nanum showed a positive correlation each other at the 0-1.1 m scale,but no correlation at larger scales at 2900 m,and a negative correlation at all the studies scales of 3500 m.At 3800 m,there was no correlation between the two species at the scale of0-1.4 m and a negative correlation at larger scales,with the correlation increased with increasing scale.

关 键 词：矮嵩草 火绒草 点格局分析 海拔 高寒草甸 

分 类 号：Q948[生物学—植物学]