黄花蒿野生群落的种间关系及其对水淹干扰响应

为探明野生黄花蒿伴生植物种间关系对水淹的响应,于2006～2007年在野生黄花蒿抚育基地,设置水淹样带,并通过种间关联分析及种间协变的秩相关分析对样带上的植物种间关系进行比较分析。结果表明:水淹对大多数植物种对的关联影响不显著,而对种间协变的秩相关系数却有一定的影响,且不同种对之间的协变关系对水淹影响有较大差异,说明植物种间协变关系既受环境波动和干扰因子影响,也取决于组成种对的植物种的生态学特性,其中主要是对水分状况反应的差异。以组成群落物种的数量特征为基础的种间协变系数比只依据物种出现与否的二元数据为基础的种间关联指数对于外界干扰反应更为敏感。

Interspecific relations of the wild community of Artemisia annua and their responses to flooding disturbance

To investigate the effect of flooding disturbance on the interspcefic relations of associated species of Artemisia annua,a comparison study was conducted in the natural fostering base from 2006 to 2007. Contingency table was used to calculate the interspecific association indice,while Spearman Rank correlation coefficient was adopted to analyze the interspecific covariance. The results showed that flooding disturbance had little effect on the association type for most species pairs,but had some effect on the rank coefficients of inter-specific co-variance. Different species pairs varied greatly in their responses to the flooding disturbance. It showed that the inter-specific co-variance relations were not only dependent on environmental perturbation or disturbance factors,but also on the biological and ecological properties of the species that comprised the species pairs. Interspecific covariance based on the numerical properties of the communities were much more sensitive to the external disturbance than the interspecific associations caculated only based on the binary data of"presence or absence of species".