贵州北盘江不同强度石漠化区木本植物多样性及生态功能群研究

该研究通过典型群落抽样和聚类分析方法,分析贵州北盘江不同石漠化强度等级的木本植物多样性变化特征,以明确不同石漠化强度等级上的适应性功能群树种组成。结果表明:(1)随着石漠化强度的增大,木本植物的科、属、种数皆呈下降趋势,适生树种数减少;落叶型植物种类相对增加,常绿型植物种类相对减少;矮、小高位芽植物的适应种类相对增加,中、高位芽植物的适应种类相对减少。(2)欧氏距离为6.5时,将46种优势种划分为8个功能群,其中,轻度石漠化型有3个功能群共21个树种;中度石漠化型有3个功能群共14个树种;强度石漠化型有2个功能群共10个树种。

Study on Woody Plant Diversity and Ecological Function Groups of Different Rocky Desertification Gradients in Beipan River Basin of Guizhou

The species richness of woody plant was investigated in an area desertified at different gradients in Beipan River Basin of Guizhou Province via the method of cluster analysis, and the adaptive capability of different tree groups was clarified according to the desertification of their habitat. The study results indicated that: (1) the biodiversity expressed in families, genera and species decreased with the desertification extent increasing. In specific, desertification increased the species number of the deciduous plants, the nanophanerophyte and the microphanerophyte, but decreased the evergreen plants, the mesophanerophyte and the megaphanerophyte. (2) Forty six dominant species were divided into 8 functional groups when the Euclid Distance equaled 6.5. There were 3 functional groups with 21 tree species in the area slightly desertified, 3 functional groups including 14 tree species in the medium desertified area, and 2 functional groups including 10 tree species in the heavily desertified area.