太白红杉(Larix chinensis)混交林径级结构与竞争的关系  

The size structure and competitive relationships of Larix chinensis in mixed-conifer forest types on Taibai Mountain,China

作　　者：段仁燕[1] 王孝安[1] 黄敏毅[2] 涂云博[1] 汪超[1] 

机构地区：[1]陕西师范大学生命科学学院,西安710062 [2]安庆师范学院生命科学系,安徽安庆246011

出　　处：《生态学报》2007年第11期4919-4924,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30470324);安徽省教育厅自然科学基金资助项目(2006KJ154C;KJ2007B169)~~

摘　　要：混交林的径级结构和竞争关系的研究可在一定程度上预测群落的动态变化趋势。探讨了太白山太白红杉(Larix chinensis)混交林的径级结构和竞争关系,并对该区域森林的动态变化趋势进行了预测。结果表明:①在混交林内,太白红杉幼苗数量较少,更新差,种群径级结构呈衰退型;而巴山冷杉(Abiesfargesii)幼苗数量较多,更新良好,种群径级结构为增长型。②太白红杉种内竞争强度大于种间竞争强度,巴山冷杉种内竞争强度小于种间竞争强度。在混交区域,巴山冷杉处于群落的优势地位,而太白红杉处于劣势地位,应加强对太白红杉的保护,合理抚育管理太白红杉幼苗。Competition among plants exists when resource availability falls below the sum requirement for optimal growth of the community. By studying the size structure and competitive relationships of mixed forest, the dynamics of community can be predicted. The size structure and competitive relationships of the Larix chinensis mixed-conifer forest type on Taibai mountain were studied. The results were as follows, （1） The quantity of Larix chinensis seedlings and saplings was low, and the size structure indicated a declining population, while the quantity of Abies fargesii seedlings and saplings were relatively great, and the size structure indicated a growing population. （2） For L. chinensis, the intraspecific competition intensity was stronger than interspecific ; in A. fargesii the reverse was true, which implies that A. fargesii is the superior competitor. In the mixed-conifer forest, management activities, such as cutting non-target species, should be taken, so as to promote optimal environmental conditions for seedling recruitment in the rare L. chinensis.

关 键 词：太白红杉 巴山冷杉 竞争 径级结构 动态 

分 类 号：S718.5[农业科学—林学]