桂林喀斯特石山阴香群落主要种群的种间关系

Interspecific Relationships among Main Species of Cinnamomum burmannii Community on Karst Hills of Guilin

采用2×2列联表的χ2检验和Spearman秩相关系数,分析了桂林喀斯特石山阴香群落乔木层12个和灌木层13个主要种的种间关系。结果表明:(1)乔木层χ2检验有1个种对为显著正关联,1个种对为显著负关联;Spearman秩相关分析有3个种对为显著正相关,4个种对为显著负相关。灌木层χ2检验仅有1个种对为显著正关联;Spearman秩相关分析有8个种对为显著正相关,2个种对为显著负相关。整体来看,种对间达到显著水平的种对数较少,大多数种间关系松散,独立性相对较强;(2)正关联的种对主要体现了它们间生物学特性相近,对生境的生态适应性相似和相互重叠的生态位;而负关联的种对间往往具有不同的生物学特性,对生境条件的适应性相异或存在相互竞争;(3)喀斯特石山生境的复杂性和多样性,以及人为干扰的加剧等因素对阴香群落种间关系的波动影响明显。

Based on the data collected from field investigations, the interspecific relationships of 12 tree layer species and 13 shrub layer main species of Cinnamomum burmannii community on karst hills of Guilin were analyzed by using X^2 test and Spearman＇ s rank correlation coefficient. The results show that： （1） In tree layer, based on X^2 test （ p 〈 0.05 ）, one species-pairs showed significant positive association, and one species-pairs showed significant negative association. Based on Spearman＇ s rank coefficients, 3 species-pairs were significant or very significant positive correlation, and 4 species-pairs had significant or very significant negative correlation. In shrub layer, based on X^2 test （ p 〈 0.05 ）, one species-pairs showed significant positive association. Based on Spearman＇ s rank coefficients, 8 species-pairs were significant or very significant positive correlation, and 2 species-pairs had signifi- cant or very significant negative correlation. On the whole, species-pairs that present significant or very significant association was few in number, most species were not closely related with each other and independently distributed. （2） 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 adaptabil- ity to the habitat or existing inter-competitions tended to be negatively related. （3） The main factors that signifi- cantly affect the fluctuation of interspecific relationships in C. burmannii community were the complexity and diversity of habitats of Karst hills, human disturbance, etc.