西北林学院学报2018，Vol.33Issue(1)：43-48,6.DOI:10.3969/j.issn.1001-7461.2018.01.07
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 pruinosa in Different Habits along the Up Reaches of Hotan River
摘要
Abstract
Inorder to provide a theoretical reference for population protection and restoration of Populus pruinosa,population structure,distribution pattern and intraspecific competitive relationships of P.pruinosa were analyzed and compared among different habitats.Using the methods of wild community investigation,the P.pruinosa community plots were established according to the habits difference in the up reaches of Hotan River,the plot areas were 0.5 hm2 (habit Ⅰ) and 1.5 hm2 (habit Ⅱ),respectively.The results were as follows.1) The number of P.pruinosa population was the highest among those with diameter ranged 8,and 12 cm habit 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 Ⅱ.2) P.pruinosa 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 competition 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 competition 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 characteristics and competitive relationship of P.pruinosa population had some differences affected by habitats.When the DBH of P.pruinosa was less than 10 cm,artificial tending management needed to be implemented in habits Ⅰ.Some artificial measures such as ecological water transport was carried out as soon as possible for promoting regeneration and ensuring stability of P.pruinosa population in habits Ⅱ.关键词
生境/灰胡杨/种群结构/种内竞争Key words
habitats/Populus pruinosa/population structure/intraspecific competition分类
农业科技引用本文复制引用
周禧琳,吕瑞恒,韩路,袁林..和田河不同生境灰胡杨种群结构特征及竞争关系分析[J].西北林学院学报,2018,33(1):43-48,6.基金项目
国家自然科学基金(31360109) （31360109）
新疆生产建设兵团科技局博士点基金(2011BB021) （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). （2016BB007）
