The morphological changes and analysis of phosphorus in the root soil of emergent aquatic plant in the wetland
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.
NETL
NSTL
万方数据
维普
