衡阳盆地紫色土丘陵坡地自然恢复灌丛阶段主要种群联结性分析

采用2×2列联表，对衡阳盆地自然恢复灌丛阶段植物群落中20个主要种的种间联结性进行分析，结果表明：（1）自然恢复灌丛阶段群落优势种多物种间显著负关联；（2）群落中重要值较高的20个种群组成的190种对中，有58对呈显著正联结，有34对呈显著负联结；（3）以X2为基础，结合联结系数和种间关联度的3个指标较好地测定了20个主要植物种群的联结性。

Interspecific Associations Analysis of Principal Species in Natural Vegetation Recovery Shrub Stage in Sloping-land with Purple Soils in Hengyang Basin

Based on 2×2 contingency table,the interspecific association of 20 principal plant species in natural vegetation recovery shrub stage in sloping-land with purple soils in Hengyang Basin was studid.The results showed that:(1)The overall associations among dominant species in plant community had significant negative association;(2) Among 190 pairs of species in higher important values 20 plant populations,58 pairs were significant positive association and 34 pairs were significant were negative association;(3) Based on x2 correction test,together with association coefficient and 3 index in interspecific connection,the interspecific association in 20 principal plant species could be better measured.