Abstract:Take Scirpus planiculmis、Phragmites communis and Zizania aquatica in Yeyahu Wetland as studied objects, then different forms of inorganic phosphorus (IP) and organic phosphorus (OP) in rhizosphere and non-rhizosphere soil samples were extracted by chemical continuous extraction. The content characteristics and distribution regularities of different P forms were analyzed, and the P absorption mechanism of plants was also discussed.Results show that the content of Ca-P in the rhizosphere is significantly lower than non-rhizosphere,while Ex-P、Fe-P and Oc-P are the opposite.Also there is a OP cumulative trend as all the four different forms of OP in rhizosphere are higher than non-rhizosphere. The Ca-P/TP in rhizosphere is significantly less than that of non-rhizosphere, which indicated that the plants can transform Ca-P which is difficult to be absorbed into other forms to use.HR-OP/TP in rhizosphere is less than non-rhizosphere, but MR-OP/TP is just the opposite, indicating that there is a trend that the stable forms of OP can convert into high activity ones. TIP/TP in rhizosphere of all the three plants is less than the non-rhizosphere, meanwhile, almost the whole TOP/TP in rhizosphere is greater than non-rhizosphere. Accordingly, a hypothesis can be infered that in the P up-take process of roots, IP is the main part which is absorbed, yet a large number of OP wil be accumulated until transformed.
刘晶晶, 李敏, 曲博, 其美. 湿地挺水植物根系土壤中的磷形态变化与分析[J]. 中国环境科学, 2013, 33(11): 2040-2046.
LIU Jing-Jing, LI Min, QU Bo, QI Mei. The morphological changes and analysis of phosphorus in the root soil of emergent aquatic plant in the wetland. . CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(11): 2040-2046.