水土保持通报2016，Vol.36Issue(3)：346-352,357,8.
边坡生态防护工程生境基材的磷素吸附－解吸特征
Absorption and Desorption Characteristics of Phosphorus in Substrates Used in Slope Ecological Rehabilitation Engineering
摘要
Abstract
[Objective] To determine the utilization of phosphorus in slope ecological rehabilitation substrate in order to provide theoretical basis for optimizing substrate formulation .[Methods] Adsorption‐desorption characteristics of phosphorus in five types of slope ecological rehabilitation substrates were studied via con ‐stant temperature shaking culture .Then ,the adsorption‐desorption capacity and loss risk of the five sub‐strates were compared with factor analysis .[Results] The maximum adsorption capacity (Qm ) ,maximum buffering capacity (MBC) and phosphorus sorption index (PSI) have shown that the phosphorus fixation ca‐pacity of the five substrates was in an order of the natural secondary forest > the external‐soil spray seeding >the thick layer substrate > the framed beams soil covering > the vegetation‐compatible concrete .It showed that Qm had positive correlation with clay content ,while it had negative correlation with organic matter con‐tent and pH value .The desorption ability of the five types of substrates was the vegetation‐compatible con‐crete > the framed beams soil covering > thick layer substrate > the external‐soil spray seeding > the natural secondary forest .The average desorption rate had significantly positive correlation ,and it also had positive correlation with organic matter content .The negative correlation was found between the average desorption rate and clay content .This study showed that Qm ,MBC ,PSI ,the average desorption rate and easy desorp‐tion phosphorus(RDP) could best reflect the phosphorus loss risk of five different substrates .It showed that from high to low ,the order of the phosphorus loss risk was the vegetation‐compatible concrete ,the framed beams soil covering ,the external‐soil spray seeding ,thick layer substrate and the natural secondary forest . [Conclusion] The natural secondary forest has the highest conservation capacity of phosphorus in the five ec‐ological rehabilitation engineering ways ,while the vegetation‐compatible concrete has the lowest .In slope ecological rehabilitation engineering ,the proportion of clay content should be increased and the dosage of ce‐ment should be decreased ,or buffering material be added into substrate ,so that the substrate can have a stronger phosphorus adsorption capacity ,the larger phosphorus storage ,the smaller phosphorus loss risk . Thus ,the utilization ratio of phosphorus can be improved and the supplying ability can last longer .关键词
边坡/生态防护工程/磷素/吸附/解吸Key words
slope/ecological rehabilitation engineering/phosphorus/adsorption/desorption分类
农业科技引用本文复制引用
夏振尧,牛鹏辉,梁永哲,薛海龙,吴彬,许文年..边坡生态防护工程生境基材的磷素吸附－解吸特征[J].水土保持通报,2016,36(3):346-352,357,8.基金项目
“十二五”国家科技支撑计划项目“金沙江梯级水电开发区生态保护与入库泥沙调控关键技术与示范”（2012BAC06B02）；三峡库区生态环境教育部工程研究中心开放基金 （）
