子午岭乔木群落演替过程中种间联结性分析  

Analysis of Interspecific Association for Forest Successional Series of Arbors in Ziwu Mountain

作　　者：李刚[1] 朱志红[1] 王孝安[1] 郭华[1] 

机构地区：[1]陕西师范大学,西安710062

出　　处：《东北林业大学学报》2008年第11期25-28,共4页Journal of Northeast Forestry University

基　　金：国家重点基础研究与发展规划"973"资助项目(2002CB111505);2007年陕西师范大学研究生创新基金(2007CXS032)资助

摘　　要：基于2×2列联表,以χ2统计量、联结系数、Person相关系数和多物种关联指数为参数,探讨了黄土高原子午岭马栏林区白桦林、油松林、油松+辽东栎混交林和辽东栎林乔木种间联结性与群落演替阶段及群落稳定性之间的关系。研究表明:群落演替后期具有低关联值的物种对数的比例增加,种间联结强度逐渐减弱,具有显著种间联结关系的物种对数及其所占比例减少,而且多数种对为正关联;②各群落优势种白桦(Betula platyphyl-la)、油松(Pinus tabulaeformis)和辽东栎(Quercus wutaiensis)在各自群落中的优势地位明显,且两两之间的关联不显著;③随着群落演替,多物种种间关联值由负变为正,但对统计量的检验却均不显著。这些结果说明:现阶段该地区森林群落在恢复演替的过程中种间关联程度逐渐降低,多物种之间的相互关系有逐渐变为正相关的趋势,但目前各群落多物种间在整体上尚不存在显著的正关联关系。演替系列各群落都具有相对的稳定性,演替顶极辽东栎群落的种间联结性最弱,稳定性最高,但多物种间不显著的正相关说明该地区分布最广、面积最大的辽东栎群落可能尚未达到稳定状态,仍需要对该地区天然植被进行长期保护。Based on a 2×2 contingency table, a series of parameters including X^2 -test, association coefficient （AC）, Person＇s correlation coefficient（PCC） and variance ratio（VR） were used to discuss the relationships betweerf interspecific association of arbors and the stability and succession of communities in Malan forest area, Ziwu Mountain. Result showed that the proportion of species pairs which had low absolute values of AC and PCC increased and the intensity of association became weak gradually with the progress of succession. The number and proportion of species pairs associated significantly reduced, furthermore, most of those species pairs associated positively. The important value of the dominant species such as Betula platyphylla, Pinus tabulaeforrnis, Quercus wutaiensis was much higher than that of the others in their own communities, and the interspecifie association between them was not significant. With the succession of comntunity, VR changed from negative to positive, but all of them were not significant. The results suggested that the strength of interspecifie association between species became infirm. The tendency of VR was towards positive but not significantly in the local forest communities at present. Every community was stable relatively. Interspecific association was the loosest and stability was the highest in Q. wutaiensis community. But the insignificant positive association among species showed that Q.wutaiensis community has not reached the stable state, so we still should protect the local natural vegetation reasonably for a long time.

关 键 词：子午岭 种间关联 群落演替 油松 辽东栎 

分 类 号：Q948.122.1[生物学—植物学] Q948.154