和田河不同生境灰胡杨种群结构特征及竞争关系分析  

Population Structure and Intraspecific Competition of Populus pruinosain Different Habits along the Up Reaches of Hotan River

作　　者：周禧琳[1,2] 吕瑞恒[1,2] 韩路[1,2] 袁林[1] 

机构地区：[1]新疆塔里木大学植物科学学院,新疆阿拉尔843300 [2]新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔843300

出　　处：《西北林学院学报》2018年第1期43-48,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金(31360109);新疆生产建设兵团科技局博士点基金(2011BB021);新疆生产建设兵团科技局重点实验室与区域创新平台建设计划(2016BB007)

摘　　要：分析比较不同生境条件下灰胡杨种群结构、空间分布格局及种内竞争关系,为和田河上游灰胡杨种群的保护和恢复提供理论参考。在和田河上游依据生境不同,设置灰胡杨群落样方,大小分别为0.5hm^2(生境Ⅰ)、1.5hm^2(生境Ⅱ),采用相邻格子法调查分析灰胡杨种群。结果表明:1)生境Ⅰ8、12cm径阶范围灰胡杨种群数量分布较多,分别占总株数的33.25%、46.55%,幼苗、幼树缺乏。生境Ⅱ种群数量在4cm径阶分布最多,而在<2cm径阶范围分布最少,种群数量分布不合理,处于衰退种群。2)生境Ⅰ灰胡杨种群在0~1.8m尺度呈集群分布,而在>1.8m尺度条件下表现为随机分布。生境Ⅱ在0~42m范围内呈集群分布,42~48m范围内为随机分布,随着尺度逐渐增大,表现出向均匀分布转化的趋势。3)生境Ⅰ灰胡杨种群随着对象木胸径增大,平均竞争指数呈逐渐减小的趋势,而生境Ⅱ则表现出先增大后减小的趋势。4)生境Ⅰ灰胡杨种群对象木胸径与竞争强度之间服从幂函数关系,生境Ⅱ服从指数函数关系。通过函数模拟预测,生境Ⅰ灰胡杨胸径达到10cm后,种内竞争强度趋于稳定,而生境Ⅱ各径阶之间竞争强度变幅不大。受生境的影响,灰胡杨种群结构特征及竞争关系有较大差异,生境Ⅰ灰胡杨胸径≤10cm时,需进行人工抚育管理,生境Ⅱ灰胡杨种群则需尽快采取生态输水等人工措施促进灰胡杨更新复壮,保证种群结构的稳定性。Inorder to pruinosa , population sa were analyzed and tion, the P, p of Hotan Riv as follows. 1） and 12 cm ha provide a structure, compared theoretical reference for population distribution pattern and intraspeeific artlong different habitats. Using the ruinosa community plots were established according to protection and restoration of Populus competitive relationships of P. pruino- methods of wild community investiga- the habits difference in the up reaches er,the plot areas were 0.5 hm2 （habit I ） and 1.5 hm2 （habit Ⅱ ） ,respectively. The results were The number of P. pruinosa population was the highest among those with diameter ranged 8, bit Ⅰ ,which accounted for 33.25% and 46.55% ,respectively. Seedlings and saplings in habits Ⅰ were rarely observed. In habitat Ⅱ,in the highest number was found in those with diameter 4 cm, the least population number was in less than 2 cm diameter grade range. The number of P. pruinosa population distributed unreasonably, the population was in declining stage in Habits H. 2） P. p ruinosa population showed cluster distribution pattern in 1--1.8 m scales,the scales above 1.8 m was random distribution in habits I. The population showed cluster distribution pattern within 0--42 m random distribution patter within 42-48 m range,with the scale increasing,it showed the trend to the uniform distribution in Habits Ⅱ. 3） With the DBH increase of objective tree, the population competition index decreased gradually in Habits Ⅰ ,and showed first increasing and then decreasing trend in Habits Ⅱ. 4） The relation between com- petition intensity and breast height diameter of objective tree nearly conformed to power function in habits Ⅰ , but exponential function in habits Ⅱ. The forecast by function simulation showed that intraspecific com- petition intensity was tending towards stability in habits i when the DBH reached 10 cm, and the wave range of competition intensity during various diameter grade was not too obvious in habits Ⅱ. Structure characterist

关 键 词：生境 灰胡杨 种群结构 种内竞争 

分 类 号：S792.11[农业科学—林木遗传育种]