边坡生态防护工程生境基材的磷素吸附-解吸特征

夏振尧; 牛鹏辉; 梁永哲; 薛海龙; 吴彬; 许文年

doi:10.13961/j.cnki.stbctb.2016.03.059

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边坡生态防护工程生境基材的磷素吸附-解吸特征

试验研究

- 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
- 水土保持通报 2016年36卷第3期页码：346-352
- 作者机构：
  
  1. 三峡地区地质灾害与生态环境湖北省协同创新中心,湖北,宜昌,443002
  2. 三峡大学土木与建筑学院,湖北,宜昌,443002
  3. 三峡大学生物与制药学院,湖北,宜昌,443002
  4. 东北林业大学生态研究中心,黑龙江,哈尔滨,150040
- 作者简介：
- 基金信息：
  
  “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（KF2013-10）
- DOI：10.13961/j.cnki.stbctb.2016.03.059
  中图分类号：
- 纸质出版：2016
- 稿件说明：
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夏振尧, 牛鹏辉, 梁永哲, 等. 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.

XIA Zhenyao, NIU Penghui, LIANG Yongzhe, et al. Absorption and Desorption Characteristics of Phosphorus in Substrates Used in Slope Ecological Rehabilitation Engineering[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 346-352.
夏振尧, 牛鹏辉, 梁永哲, 等. 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. DOI： 10.13961/j.cnki.stbctb.2016.03.059.

XIA Zhenyao, NIU Penghui, LIANG Yongzhe, et al. Absorption and Desorption Characteristics of Phosphorus in Substrates Used in Slope Ecological Rehabilitation Engineering[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 346-352. DOI： 10.13961/j.cnki.stbctb.2016.03.059.

摘要

［目的］明确边坡生态防护工程生境基材的磷素保持能力，为优化基材配方提供依据。［方法］以向家坝水电站边坡生态防护工程生境基材为对象，采用恒温振荡培养法进行吸附和解吸试验，比较不同基材的磷素吸附和解吸能力，并用因子分析法比较基材磷素的流失风险。［结果］最大吸附量（Q

）、最大缓冲容量（MBC）和磷吸持指数（PSI）3个指标均显示，5种基材的固磷能力为：天然次生林 > 客土喷播 > 厚层基材 > 框格梁覆土 > 植被混凝土，Q

与基材的黏粒含量显著正相关，与有机质含量和pH值显著负相关；磷的解吸能力为：植被混凝土 > 框格梁覆土 > 客土喷播 > 厚层基材 > 天然次生林，平均解吸率与pH值极显著正相关，与有机质含量显著正相关，与黏粒含量显著负相关；因子分析表明Q

，MBC，PSI、平均解吸率和易解吸磷5个指标可以表示边坡磷素的流失风险。边坡磷素流失风险的大小为：植被混凝土 > 框格梁覆土 > 客土喷播 > 厚层基材 > 天然次生林。［结论］ 5种生态防护方式中，天然次生林对磷的保持能力最好，植被混凝土基材对磷的保持能力最差；在施工中应当增大基材中黏粒的比重，并适当减少水泥用量或加入缓冲物质，以使基材能够具有较强的磷吸附能力、较大的磷库容和较小的磷流失风险，从而提高磷素的利用率并使其具有持久的供磷能力。

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 constant temperature shaking culture. Then

the adsorption-desorption capacity and loss risk of the five substrates 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 capacity 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 content and pH value. The desorption ability of the five types of substrates was the vegetation-compatible concrete > 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 desorption 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 ecological 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 cement 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

Keywords

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