伏牛山森林生态系统灌木植物功能群分类

伏牛山国家级自然保护区位于中国东部亚热带和暖温带的过渡区,植被优势种明显,以灌木优势种为主体进行植物功能群分类,可以对森林生态系统的功能、框架结构及类群分布有一个明确的认识.采用群落生态学的调查方法,在伏牛山南北坡设置66个典型样方.根据调查结果,通过计算重要值,选取优势度相对较大的灌木树种进行种间联结及相关性分析,以X2(卡方)检验为基础,结合联结系数AC和共同出现百分率PC来测定灌木优势种间的联结性,根据优势种间的联结性及其在海拔梯度上的变化异同来划分植物功能群,把灌木优势种划分为7组植物功能群.植物功能群间物种表现出显著正联结,一起在同一生境中出现的几率较大,在长期的生长演化过程中,能适应相似的资源环境和对干扰有相似的响应,所以将其划分同一组植物功能群.植物功能群内有一些重要的形态特征有相似之处,功能群间的形态特征有明显的区别,如叶片的大小、形状等,功能群的这些相似及区别还需要生理生态学的进一步研究.

Functional group classification of shrub species in the Funiu Mountain forest ecosystem

Straddling the subtropical and warm\|temperate zones of East China, the Funiu Mountain National Nature Reserve is representative of north\|south climatic transition zones. The vegetation of this area consists of conspicuous dominant groups. Looking for insight into the functions, structural framework, and species distributions of this forest ecosystem, we delimited plant functional groups according to dominant shrub species. Using community ecology techniques, we investigated plant assemblages in 66 representative sampling plots on both the north and south slopes of the mountain. We used the results of this investigation to calculate species importance values, which were used to identify dominant species. We used X2 test, association coefficient (AC) and percentage co\|occurrence (PC) to measure interspecific associations of the dominant shrub species. Seven PFTs were defined according to interspecific associations and altitudinal distributions of the dominant species. These PFTs appear to reflect vegetation\|environment dynamics well. Co\|PFT species have marked similarities in some important morphological characteristics. Such characteristics differ among the PFTs. Further eco\|physiological studies are required to better understand these phenomena.