喀斯特山地青冈栎群落优势种的种间关系分析

采用2×2列联表的χ2检验和Spearman秩相关系数分析了喀斯特山地青冈栎（Cyclobalanopsis glauca）群落22个优势种的种间联结性和相关性。结果表明,在所组成的231个种对中,χ2检验中有100个种对为正联结,110个种对为负联结;Spearman秩相关系数检验有114个种对为正相关,117个种对为负相关,正、负联结或相关的种对数相近。正联结或正相关的种对主要体现了种间对生境具有相似的生态适应性和生物学特性,而负联结或负相关关系则主要由于对生境的不同偏好或相异的生物学特性所致。喀斯特山地高度的生境异质性促使优势种间的生态位相互分化,对生境的偏好趋异,负联结或负相关的种对趋于增加,因而喀斯特山地高度的生境异质性对植物种间关系的形成具有重要的影响。研究结果对于指导喀斯特地区进行人工植被恢复和重建具有一定的实践指导意义。

Interspecific relationships of dominant species in Cyclobalanopsis glauca community in karst mountain area

The study on the interspecific association and correlation among 231 species-pairs formed by 22 dominant species in Cyclobalanopsis glauca community in karst mountain area showed that 100 and 114 species-pairs were positively correlated,while 110 and 117 species-pairs had negative correlations,based on χ2 test for a 2×2 contingency table,and Spearman’s rank correlation coefficient test,respectively,and that the numbers of positive correlated species-pairs were nearly equal to the negatives.The species with similar in biological features or in ecological adaptability to the habitat or with higher degree of niche overlap tended to be positively related,while those with different biological features and different adaptability to the habitat or existing inter-competitions tended to be negatively related.The niche partitioning and the difference in habitat preference among each dominant species were promoted by high level of habitat heterogeneity in karst mountains,and so the species-pairs with negative association or negative correlation may tend to increase in number.Therefore,habitat heterogeneity plays a crucial role in the formation of the interspecific relationships among plant species in karst mountain area.Findings from this study have significance for the practice of artificial vegetation restoration and reconstruction for degraded ecosystem in karst area.