摘要
从径级结构、静态生命表、存活曲线和个体空间分布格局等方面研究新疆天山北坡天山云杉的种群结构特征与空间分布规律。研究结果表明:1)种群年龄结构中幼苗幼树(Ⅰ级)比例最大(82.11%),中树(Ⅲ-Ⅵ级)和大树(Ⅶ-Ⅹ级)比例次之,小树(Ⅱ级)比例最小(0.26%)的规律;2)种群死亡率在Ⅰ径级最高(99.70%),随着径级的增加,死亡率呈现"高-低-高"模式,种群生命期望呈现"低-高-低"的模式;3)天山云杉种群的存活曲线接近于DeeveyⅢ型,即Ⅰ径级存活指数最高(6.91),Ⅱ径级(1.16)急剧下降,Ⅱ-Ⅴ径级逐渐上升,随后逐渐下降;4)种群格局随取样尺度由25-400m2增加,聚集强度逐渐降低,其中,在取样规模为25和150m2尺度上聚集分布强度较大;5)随着种群年龄增加,分布格局由聚集型向随机型过渡,聚集强度减弱。幼苗幼树在取样规模为25和150m2尺度上聚集分布强度较大;中树在50m2和150m2尺度上较大;而小树和大树聚集强度不受取样面积影响。因此,天山北坡的天山云杉天然林应适当间伐以促进更新,种群更新的最适林隙面积为25m2。
Based on the life table, DBH （diameter at breast height） class structure, survivorship curve and spa tial distribution of Picea schrenkiana on the northern slopes of the Tianshan Mountain, China were studied. The results were as follows ： I ） The DBH class structure of the population indicated that most individuals were assem bled in the seedling stage （DBH class I ,82.11% ） , young （DBH class m w） and mature （DBH class VII X ） were the next, and sapling ones （ DBH class 11 , 0.26% ） were the least. 2） The mortality rate of the seed lings was the highest （99.70%）. With DBH class increasing, mortality displayed ＂high low high＂ mode, while the expectancy life of population displayed ＂low high low＂ mode. 3） The survivorship curve of pop ulation generally matched a Deevey Type 111. The survivorship index was the highest in DBH class I （6.91）, schrenkiana forest reach thinning period due to difficult regeneration on the northern slopes of the Tianshan Moun tain. Under natural circumstances, the 25m2 at the highest clumped intensity of seedling was the optimal area for
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第1期91-96,共6页
Journal of Arid Land Resources and Environment
基金
新疆生产建设兵团重点公益林生物多样性保护及生态状况监测项目(兵财企2006-813)资助
