关键词: 取样尺度, 物种多样性指数, 次生林, 空间分布

Abstract: Close tonature plant communities play an important role in promoting community stability, activating the internal regulation mechanism of ecosystem and enriching biodiversity. We analyzed community characteristics and environmental factors of forest vegetation at Jiufeng Mountain, a low altitude district in Beijing, using numerical classification and environmental ordination. Then, we proposed some modes of closetonature plant community construction suitable for Beijing. The results showed that the 10 plots investigated could be classified into four associations by TWINSPAN. The ordination results of plots and main plant species were consistent with those of TWINSPAN. The mixed pine and oak forest with Pinus tabuliformis, Quercus dentata and Q. variabilisas the dominant species was significantly correlated with the altitude and soil factors including pH value, organic matter content, and noncapillary porosity. There were differences in soil pH and organic matter content between natural mountain soil and urban greenspace soil. According to the basic principles of adaptability, scientificity and artistry, we proposed five basic modes of close to nature plant communities.

Key words: spatial distribution, species diversity index, secondary forest., sampling scale