广州市白云区裸地近自然化植被恢复效果研究

[Objective]In this paper,near-natural vegetation restoration of bare land was carried out based on restoration ecology as the main theoretical basis.[Method]The revegeting effect of a slope behind Yangzhao and Yangxun Building in Baiyun Campus of Zhongkai University of Agricultural Engineering was studied by the method of revegeting near nature.The environmental conditions of nature were completely simulated.The seeds of trees,shrubs and grass were mixed by outdoor sowing test,and no artificial management method was adopted,no weeds were removed,no fertilizer or pesticide was applied.The soil elements and microclimate were measured as the research methods,and the diversity of plants and the physical and chemical properties of the soil were regularly observed.[Result]The results showed that:(1)In terms of plant diversity,the species richness of slope plants increased by 5.6%compared with that before,and the species richness of herbaceous plants increased more than that of woody plants.(2)In terms of soil physical and chemical properties,the content of organic matter and soil pH increased by 26.7%and 7.9%respectively with the effect of vegetation restoration,while the content of nitrogen decreased by 12.9%due to the rapid growth of plants.(3)In terms of microclimate change,compared with bare land,the experimental plot has a larger area of vegetation coverage on the whole,so it has a larger specific heat capacity,so the variation range of temperature and humidity is smaller than bare land.[Conclusion]In this experiment,the survival of woody plants in the sown plants is better,and the growth rate of herbs is faster.At the same time,the way of re-greening near nature can also make the original plants have better growth.Together with the experimental plants,re-greening plots can finally form a more natural ecological community,which also has a positive effect on soil improvement and microclimate formation.