论文部分内容阅读
本文通过２×２联列表以多种指标分别测定了庐山常绿阔叶、落叶阔叶混交林３６个乔木种群在抽样面积分别为１００ｍ２和４００ｍ２时的种间联结性。结果表明：在中亚热带山地森林植被研究中，以Ｘ２检验为基础，结合联结系数ＡＣ和共同出现百分率ＰＣ来测定植物种群的联结性，效果较好。一方面，不同大小的样方能反映物种种间联结性的空间变化；另一方面，抽样面积为１００ｍ２，更能准确全面地表现优势种群种间联结性的特征。种间正联结性越强，其生态位重叠值越大，反之，种间负联结性越强，其生态位重叠值越小。最后，还将这３６个种群按其联结性划分为４个生态种组。
In this paper, the inter-species associations of 36 tree populations in the evergreen broad-leaved and deciduous broad-leaved mixed forests in Lushan Mountain were determined by 2 × 2 co-inventor with various indexes in the sampling area of 100m2 and 400m2, respectively. The results showed that in the study of forest vegetation in the subtropical mountainous area, the correlation between plant population was determined based on the X2 test, combined with the linkage coefficient AC and the common percentage PC, which was better. On the one hand, quadrats of different sizes can reflect the spatial change of inter-species connectivity; on the other hand, the sampling area is 100 m2, which can more accurately and comprehensively show the characteristics of interspecific association of dominant species. The stronger positive interspecific association, the greater the niche overlap, whereas the stronger negative interspecific association, the smaller the niche overlap. Finally, the 36 populations were also divided into four ecotype groups according to their connectivity.