摘要
通过对剑湖湿地湖滨带茭草(Zizania latifolia)、水蓼(Polygonum hydropiper)、蒿(Artemisia selengensis)、禾草(Alternanthera philoxeroides)和蓼茭混交5种植物群落类型对氮、磷的根际效应进行研究,并从植物生物量、植物富集量、根际土壤有效氮磷和pH值变化对根际效应的影响,揭示不同种类湿地植物对氮磷净化效率差异的内在机制。结果表明,5种植物群落的根际土壤氮、磷含量与非根际土壤相比均显著增加,其中茭草根际氮、磷增加最大,根际效应最为明显,茭草对氮磷的富集作用最强。植物对氮、磷根际效应大小顺序依次为茭草>蓼>蒿>禾草;植物根际土壤pH值和植株对氮磷的需求大小都是根际出现氮、磷累积的原因。
Rhizosphere effects of five plant community types such as Zizania latifolia, Polygonum hydropiper, Artemisia selengensis, Alternanthera philoxeroides, Zizania latifolia and Polygonum hydropiper mixed on nitrogen and phosphorus in rhizosphere were compared in Jianhu Wetland lakeside zone. Phytomass, plant enrichment, phosphorus utilization efficiency and rhizosphere pH were also analyzed to reveal the mechanism of phosphorus retention. Results showed that rhizosphere soil nitrogen and phosphorus of five plant community types increased significantly comparing with those in bulk soils. Nitrogen and phosphorus were accumulated the most in rhizosphere soil of Zizania latifolia with the most obvious rhizosphere effect. The order of the rhizosphere effect of plant community on nitrogen and phosphorus was Zizania latifolia and Polygonum hydropiper mixed, Polygonum hydropiper, Artemisia selengensis and Alternanthera philoxeroides, pH of rhizosphere soil and the demand for nitrogen and phosphorus were the main factors affecting the rhizosphere cumulative effect of nitrogen and phosphorus.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第10期73-77,共5页
Environmental Science & Technology
基金
国家重点基础研究发展计划“973”前期研究专项(2010CB434807)
国家自然科学基金项目(U0933601)
云南省中青年学术技术带头人后备人才培养项目(2010CI016)
云南省西南林业大学生物技术特色专业建设项目(50116001)
云南省教委湿地生态学创新团队项目
关键词
剑湖湿地
湖滨带
氮
磷
根际效应
Jianhu Wetland
lakeside zone
nitrogen
phosphorus
rhizosphere effect
