CAJ | 학술논문

利用根际土壤溶液的原位抽提和微量样品分析技术,对南四湖湿地的芦苇(Phragmites communis)、芦竹(Arundo donax)、香蒲(Typha latifolia)、水葱(Scirpus validus)、茭草(Zizania aquatica)和喜旱莲子草(Alternanthera philoxeroides)等6种水生植物进行了野外原位根际土壤溶液的磷素浓度分析,并从根系形态、磷素吸收利用有效性、根际土壤有效磷素和pH值变化等根际效应差异,揭示不同种类湿地植物磷素净化效率差异的内在机制.结果表明,香蒲对磷素的吸收最大;其次是芦苇、芦竹和茭草;再次是水葱和喜旱莲子草.香蒲的根际土壤溶液磷素浓度(PO_4~(3-),0.37μg/L)显著低于非根际区浓度(PO_4~(3-),0.47μg/L);而芦苇、芦竹和水葱则表现为根际土壤磷素浓度高于非根际.香蒲通过强大的根系获取了较多的磷素,芦竹则通过根际酸化促进了根系对磷素的吸收,实现了根际土壤较高的磷素去除率.喜旱莲子草根际土壤有效磷增加了48%,可能是由于其较强的根际酸化(pH值降低约O.9)增加了土壤磷素向水体流失的风险,故在湿地磷素修复中应避免使用.
이용근제토양용액적원위추제화미량양품분석기술,대남사호습지적호위(Phragmites communis)、호죽(Arundo donax)、향포(Typha latifolia)、수총(Scirpus validus)、교초(Zizania aquatica)화희한련자초(Alternanthera philoxeroides)등6충수생식물진행료야외원위근제토양용액적린소농도분석,병종근계형태、린소흡수이용유효성、근제토양유효린소화pH치변화등근제효응차이,게시불동충류습지식물린소정화효솔차이적내재궤제.결과표명,향포대린소적흡수최대;기차시호위、호죽화교초;재차시수총화희한련자초.향포적근제토양용액린소농도(PO_4~(3-),0.37μg/L)현저저우비근제구농도(PO_4~(3-),0.47μg/L);이호위、호죽화수총칙표현위근제토양린소농도고우비근제.향포통과강대적근계획취료교다적린소,호죽칙통과근제산화촉진료근계대린소적흡수,실현료근제토양교고적린소거제솔.희한련자초근제토양유효린증가료48%,가능시유우기교강적근제산화(pH치강저약O.9)증가료토양린소향수체류실적풍험,고재습지린소수복중응피면사용.
In Nansihu wetland (China), micro-suction cups were used to collect samples of soil solution from the rhizosphere of six wetland plants roots (Phragmites communis, Arundo donax, Typha latifolia, Scirpus validus, Zizania aquatica and Alternanthera philoxeroides), and capillary electrophoresis was used to determine the phosphate concentration of the soil solution. Root morphology, phosphorus uptake efficiency and phosphorus utilization efficiency, and rhizosphere pH were also analyzed to reveal the mechanism of phosphorus retention. T. latifolia was the most effective in phosphorus retention, followed by P. communis, A. donax and S. validus. Phosphorus in the rhizosphere solution (PO_4~(3-), 0.37μg/L) was significantly lower than in the bulk soil solution (PO_4~(3-), 0.47μg/L) for T. latifolia, but was reversed for P. communis, A. donax, S. validus and A. philoxeroides; no significant difference was observed for Z. aquatica. This field study suggested that T. latifolia was efficient in phosphorus retention with a strong root system. For A. philoxeroides, available phosphorus (Olsen-P) was 50% higher for the rhizosphere soil than for the non-rhizosphere, and the rhizosphere acification and phosphorus mobilization were significant. It should be avoided for phosphorus retention in wetlands.