中国农业科学 ›› 2006, Vol. 39 ›› Issue (03): 569-574 .

• 土壤肥料·节水灌溉 • 上一篇    下一篇

香港石质斜坡绿化基料养分动态特征研究

毛小云,郭和蓉,陈 娴,廖宗文,何达培   

  1. 华南农业大学资源环境学院
  • 收稿日期:2005-10-20 修回日期:1900-01-01 出版日期:2006-03-10 发布日期:2006-03-10
  • 通讯作者: 毛小云

Study on Dynamic Characteristics of Substrate Nutrition Used for Greening Rock Slopes in Hong Kong

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  1. 华南农业大学资源环境学院
  • Received:2005-10-20 Revised:1900-01-01 Online:2006-03-10 Published:2006-03-10

摘要: 【目的】探讨香港石质斜坡绿化中基料的养分动态变化特征。【方法】对近6年来在香港斜坡绿化中采用同种工法和相同基料进行绿化的14个坡面的基料理化性质和绿化效果进行了观测和分析。【结果】随着时间的推移基料pH值趋向于中性,而硬度有减小的趋势。6年多以来,坡面基料的吸水、保水性能保持良好,且没有明显的冲蚀现象。基料有机质含量随时间的推移有降低趋势,但幅度较小。基料全氮含量变化不大,但全磷和全钾有上升的趋势,有效氮含量呈现先下降后上升再下降的变化规律。不同完工时间的坡面植物生物量有较大的差异,但总量均比一般草地大,绿化覆盖率均保持良好,植被总盖度在90%以上。还比较了两种不同基料在近两年来香港石质斜坡绿化过程中的养分变化特征。【结论】在石质斜坡上应用纤维类有机基料进行斜坡绿化可长久保持良好的理化性状,营养元素可循环利用,在低护理条件下持续、长期保持植被是可能的。

关键词: 石质斜坡, 基料, 养分变化特征, 绿化效果, 香港

Abstract: 【Objective】The dynamic characteristics of substrate nutrition used for greening rock slopes in Hong Kong was studied.【Method】The greening effect and physical-chemical characteristics of substrate on 14 slopes, where same technique and substrate were applied throughout the past 6 years, were examined and analyzed.【Result】The pH value tend to neutral and soil hardness had a decreasing trend. The water absorbing and retaining ability of the substrate was well maintained for over 6 years and there was no significant erosion of the substrate. The content of organic matter decreased at a slow rate as the time past. The content of total nitrogen had little change while that of both total phosphorus and potassium tended to increase. A tend of available nitrogen was observed that it decreased first and increased then and decreased finally. Biomass varied obviously with different completion years, however, biomass on each slope was relatively higher than that of grassland. The coverage provided was satisfactory and the total coverage on most slopes were over 90%. The nutrition dynamic characteristics throughout 2 years of two kinds of substrates used for greening rock slopes in Hong Kong were also studied.【Conclusion】The effect of the organic substrate used for greening rock slope could be sustained and the properties of the substrate could be stabilized. In addition, nutrients that provided for plant growth could be recycled in the system. Therefore, this greening technique is suitable to establish vegetation on man-made slopes with low maintenance.

Key words: Rock slope, Substrate nutrition, Dynamic characteristic, Greening effect, Hong Kong