塔里木河中、下游胡杨林种内竞争对比研究
Comparative Study on Intraspecific Competition of Populus euphratica Riparian Forests in the Middle and Lower Tarim River
刘建莹 1玉米提·哈力克 1何熙祥 1木扎帕尔·米吉提1
作者信息
- 1. 新疆大学生态与环境学院绿洲生态教育部重点实验室,新疆乌鲁木齐 830017
- 折叠
摘要
为探究塔里木河中、下游胡杨(Populus euphratica Oliv.)种内竞争差异及其对水分梯度的响应规律,以塔里木河下游阿拉干断面以及中游国家自然保护区胡杨种群为研究对象,在每个区域分别选取3条样带,每条样带依照水分梯度布设3个样方,共18个样方,利用Hegyi单木竞争模型探究塔里木河中、下游水分梯度下胡杨林种内竞争变化特征.结果表明:1)塔里木河中游胡杨最适竞争范围为8 m,下游最适竞争范围为10 m;2)胡杨竞争指数与胸径服从幂函数关系(P＜0.001),胡杨竞争指数随对象木胸径的增加而逐渐减小,当胡杨胸径在塔里木河下游达20 cm以上、中游达30 cm以上时,胡杨竞争指数逐渐稳定;3)随水分梯度的降低胡杨种群竞争指数呈下降趋势,且塔里木河中游的胡杨竞争压力高于下游的胡杨.立地水文条件是控制塔里木河流域胡杨竞争强度的决定性因子;在胡杨林分管理中,应充分考虑胡杨种内竞争与水分梯度之间的关系.
Abstract
In order to investigate the intra-species competition difference of Populus euphratica and its response to water gradient in the middle and lower reaches of the Tarim River,three transect zones of P.euphratica population in the Aragan Section of the lower reaches of the Tarim River and the national nature reserve in the middle reaches of the Tarim River were selected as the research objects.Each transect zone was arranged with three quadrates according to the water gradient,with a total of eighteen quadrates.Hegyi single tree competition model was used to study the variation of intraspecific competition of P.euphratica forest under water gradient in the middle and lower reaches of the Tarim River.The results showed as follows:1)The optimal competition range of P.euphratica in the middle reaches of the Tarim River was 8 m and that in the lower reaches was 10 m.2)There was a power function relationship between the competition index and DBH of P.euphratica(P＜0.001),and the competition index of P.euphratica decreased with the increase of DBH of wood.When DBH of P.euphratica reached more than 20 cm in the lower reaches of the Tarim River and more than 30 cm in the middle reaches,the competition index of P.euphratica gradually stabilized.3)The competition index of P.euphratica decreased with the decrease of water gradient,and the competitive pressure of P.euphratica in the middle reaches of the Tarim River was higher than that in the lower reaches.Site hydrological condition is the decisive factor controlling the competition intensity of P.euphratica in the Tarim River Basin.The relationship between intraspecific competition and water gradient should be fully considered in the management of P.euphratica forest.
关键词
胡杨/水分梯度/竞争指标/点格局分析/塔里木河Key words
Populus euphratica/water gradient/competition index/point pattern analysis/the Tarim River引用本文复制引用
基金项目
国家自然科学基金(32260285)
&&(31860134)
科技部新疆综合科学考察项目(第三次)(2022xjkk0301)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据