南充浅丘区人工植被的群落生态初步研究

Primary Study on Community Structure of Anthropogenic Forests in the Hilly Region of Nanchong,North of Sichuan Basin

通过对南充市近郊浅丘区10年生典型人工林进行了群落调查,并对群落组成、垂直结构和水平结构进行分析.结果表明:(1)南充市近郊的人工林群落均分为乔木层、灌木层和草本层3个层次;乔木层主要由重阳木和白杨构成,物种多样性最低,Shannon-Weiner和Simpson s指数分别是0.49和0.62,乔木郁闭度较高.灌木层和草本层虽发育略差,但组成物种多,多样性较高,均在0.7以上.(2)从群落发育来看,主要的乔木和灌木物种基本上能够实现自我更新,但乔木层建群种单一,群落易受病虫害侵袭.

The planted forest, regarded as a principal measure for reforestation since 1970s, is very common in the Sichuan Basin. A case study has been carried out to survey planted forest in Nanchong, north of the Sichuan Basin. The results indicate that species diversity is very low for tree stratum （ only two species） , i. e. , Bischofia polycarpa Populus tomentosa, while the diversity in shrub and grass layer of the community is very high, which makes the ecosystem exposure to pests and other ecological risks. The results also show that there is high heterogeneity in the horizontal distribution patterns of the planted forest community due to the to the environment heterogeneity and anthropogenic disturbances.