The Relationship Between the Plant Disposition and the Reduction of Nitrogen and Phosphorus in the Riparian Ecological Construction of Taohua River in Chongqing
Abstract:In order to study the relationship between the plant disposition and the reduction of nitrogen and phosphorus in the riparian ecological construction of Taohua river in Chongqing, the field test, pot experiment and phosphorus adsorption isotherm experiment were carried out. The results show that the different plant dispositions have different effects on the reduction of nitrogen and phosphorus; the combination of Iris japonisa, Reineckia carnea and Cinnamomum camphora enjoys higher efficiency for removing particle-bound nitrogen and phosphorus; the higher the tree coverage, the lower the efficiency will be; the pot has no significant effect on the removal of NO-3 (nitrate), but has effect on the removal of PO3-4 (phosphate), and the pot with plants can prevent the loss of NO-3 ; the soil water content and the PO3-4 removal efficiency are anti-related; the loam phosphorus adsorption capacity is higher than that of the sand, with that of the Reineckia carnea being the highest, followed by that of Iris japonisa; the combination of Iris japonisa, Reineckia carnea, Gardenia Ellis var fortuniana and Cinnamomum camphora should be adopted in Taohua river, with the Iris japonisa being put above the Reineckia carnea, and Gardenia Ellis var fortuniana, Cinnamomum camphora being mixed planted with Reineckia carnea.