Zhu Yuan, Qiu Yang, Fu Bojie, Zhang Ying
Department of Resources and Environmental Science, Beijing Normal University, Beijing 100875, China.
Ying Yong Sheng Tai Xue Bao. 2004 May;15(5):799-802.
Based on DCCA-OAC, the plant communities in Donggou catchment, Bashang region, Hebei Province, were classified into 8 types of community. The environmental gradient, structural gradient and human-disturbance could be well expressed in the ordination plot. Axis 1 reflected the spatial pattern of plant communities along the gradient of altitude and slope, while axis 2 showed the plant community distribution on different aspects. The plant communities showed a distribution gradient along moisture gradient as shown by the combination of both axes of DCCA. The communities exhibited different trends in the synusia and species composition. Betula platyphylla was only existed on the high and steep northern aspect. The dominate species of shrub and herbaceous synusia on northern aspect were Potentilla fruticosa and Carex rigescens respectively, while on southern aspect were Artemisia spp. and Agropyron cristatum. The distribution along altitude and slope also existed among dominate species of each synusia on southern aspect. In addition, human disturbance, including grazing, farming and logging, had significant influence on the temporal and spatial distribution of communities. In general, the better the habitat, the more intensive the human disturbance.
基于去趋势对应分析排序法（DCCA - OAC），对河北省坝上地区东沟流域的植物群落进行分类，共划分出8种群落类型。环境梯度、结构梯度和人为干扰在排序图中均能得到较好体现。第一轴反映了植物群落沿海拔和坡度梯度的空间格局，而第二轴展示了植物群落在不同坡向上的分布情况。通过DCCA的两个轴相结合可知，植物群落沿水分梯度呈现出分布梯度。各群落的层片和物种组成呈现出不同趋势。白桦仅存在于高陡的北坡。北坡灌木层片和草本层片的优势种分别为金露梅和硬苔草，而南坡则为蒿属植物和冰草。南坡各层片优势种沿海拔和坡度也存在分布差异。此外，包括放牧、耕种和伐木在内的人为干扰对群落的时空分布有显著影响。总体而言，生境越好，人为干扰越强烈。
