摘要
应用方差比率法,并通过2×2列联表χ2检验法及利用Jaccard指数测定法研究了秦岭北坡和巴山北坡栓皮栎所在群落主要乔木树种的种间联结性.结果表明: 1 两地栓皮栎所在群落主要乔木种群间在总体上呈显著正关联; 2 2×2列联表的χ2检验共有9 7为秦岭北坡的种对数,下同 个种对为显著正关联,1 25 个种对为显著负关联; 3 Jaccard指数标量出了两地栓皮栎所在群落中种对间的联结程度和相伴随出现的机率,两地栓皮栎所在群落中多数乔木种群间的联结性不显著且联结程度较低; 4 种对间的正关联,主要是由于它们具有相近的生物学特性以及对生境具有相似的生态适应性所致,种对间的负关联主要是由于物种间的空间排斥,适应不同的微环境的结果; 5 两地栓皮栎所在的群落处于演替的不稳定阶段.
Interspecific association of principal tree species in the communities including Q.variabilis on the north slopes of Qinling and Bashan Mt.were study using variance ration method,χ2test of 2×2 contingency table and indexes of Jaccard.The results show that:(1) The overall relativity and interspecific association are significant positive association.(2) Positive association of 9(7) speciespairs for χ2test are significant and negative association of 1(25) speciespairs are significant (The figure in brackets is speciespair of Qinling Mt.).(3) The indexes of Jaccard can be employed to show association degree of speciespair,and together with percentage cooccurrence,it is comparatively low that association degree of majority of principal trees in Q.variabilis on the north slopes of Qinling and Bashan Mt..(4) Positive association between species occur where members of a speciespair have similar biological characteristics or traits that make them ecologically adaptive for similar habitats.Negative association between species occur spaces repel of species and adapt different microhabitat.(5) Composition of the plant species and structure of the plant communities on the Qinling and Bashan Mt.is unstable stage of succession.
出处
《西北植物学报》
CAS
CSCD
2003年第6期901-905,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院知识创新项目( KZCX1-06 )
西北农林科技大学基金项目
杨凌专项基金项目
关键词
栓皮栎
种间联结
群落稳定性
Quercus variabilis
interspecific association
stebility of the plant communities
