摘要
生态绿化是重要的公路绿化方式,群落稳定性、生物多样性是生态绿化的基本特征和目标。以北京市顺平路顺义段两侧毛白杨(Populus tomentosa)群落为研究对象,应用加拿大Regent Instrument公司生产的WinSCANOPY For Canopy Analysis冠层分析仪及软件采集照片。通过资料分析和实地踏查,分析了不同径阶毛白杨群落冠上、林下的光环境特征和冠层结构特征指标如光合光量子通量密度(PPFD)、林隙分数(Gap fraction)、叶面积指数(LAI)、平均叶倾角(MLA)等,得出林隙分数随着胸径的增加下降,平均叶倾角随胸径增加下降,叶面积指数随胸径的变化虽然有些波动,但是总体上呈现增加趋势。
Ecological greening is an important way of highway greening. Community stability and species diversity are the two essential characteristics of highway ecological greening. By taking Populus tomentosa communities in the Shunyi section of Shunping Road （$305）, Beijing, as a research object and applying WinSCANOPY produced by Regent Instrument of Canada in taking photos, light environment over and under the canopy and community structure characteristic indexes, such as photosynthetic photon quanta flux density （PPFD）, gap fraction, leaf area index（LAD, and mean leaf angle（MLA）, are analyzed by data analysis and field investigation. Results show that the gap fraction of Populus tomentosa communities decreases with the diameter at breast hight（DBH）increasing and MLA decreases with the DBH increasing. Although LAI fluctuates in some degree, it also presents an ascending tendency. The study provides a basic analysis and a reference for highway ecological greening to establish a stable plant species diversity and a multi-layer structure.
出处
《水土保持通报》
CSCD
北大核心
2008年第4期38-42,共5页
Bulletin of Soil and Water Conservation
基金
北京市路政局公路生态绿化研究课题
