南宁市城区森林灌木层优势种种间联结分析

Interspecific Association Analysis of the Main Species in Shrub Layer of the Forestry in the Urban Area in Nanning

采用方差分析(VR)、χ2检验,结合联结系数AC和共同出现百分率PC对南宁市城区近自然林林下灌木层25种灌木种联结性进行定量分析。结果显示:①南宁市城区森林灌木层优势种多物种种间联结呈正关联;成对物种种间正关联居多,负关联较少,不显著居多,显著居少,说明南宁市城区森林灌木层种间具有一定的联结性,但联结性不显著,这是由于南宁市城区森林处于演替的早期阶段,各种对间随机结合,具有明显的次生性和年轻性,群落结构和功能尚不稳定;②得出10个比较明显的生态组合,有三叉苦-九节、阴香-小叶女贞、水蒲桃-土密树等,这些生态结合种组的可以作为南宁市城市森林建设的重要依据。

By variance ratio （VR） ,Χ^2 test, together with association coefficient （AC） and percentage co-occurrence （PC） ,of the 25 types of plants in shrub layer of the close-to-nature plantation in the urban area in Nanning were studied. The result indicated that：（1）the overall association of the dominant species in shrub layer in Nanning was positive. The number of positive association of the species-pairs was more and the number of negative association was less, the number of species-pairs in significantly associated was more, the number of species-pairs significantly association was less. It showed that the interspecific association was positive but not obviously correlative in most of the species pair, because it was at the early stage of the succession, so the species combinated stoehasticly, the forests showed the strong secondary and juvenility characteristics, and the structure and function of the community was instability. （2）There were 10 ecogroups of species, such as： Euodia lepta （Spreng.） Merr.-Psyehotria rubra （ Lour. ） Poir. , Cinnamomum burmanni （Nees） -Ligustrum sinense Lour. , Syzygium jambos （ L. ） Alston-Bridelia balansae Tutch and so on . There ecogroups are important for the construction of the urban forest in Nanning.