天然红树林湿地对河水中溶解性磷酸盐的净化作用初探 ——以广州市南沙开发区为例

以广州市为数不多的天然红树林湿地之一，南沙开发区内珠江火电厂下游珠江狮子洋河段西南岸以及槽船村内河道水闸下游两个区域的天然红树林湿地沿途的溶解性磷酸盐含量变化的实测数据为依据，研究天然红树林湿地对磷的净化作用。河道内红树林不同覆盖宽度区之间和不同河道之间溶解性磷酸盐含量的对比分析显示红树林湿地对水体中的溶解性磷酸盐具有很强的净化能力，河岸红树林湿地的过滤作用的大小与河岸红树林占据河道面积的大小有关，同等河宽条件下，红树林植物覆盖宽度越大其净化能力越大。

THE PRIMARY STUDY ON THE CAPABILITY OF NATURAL MANGROVE WETLANDS TO DECREASE SOLUBLE PHOSPHATE IN RIVER WATER——A CASE STUDY OF NANSHA DISTRICT OF GUANGZHOU

An excess of soluble phosphate in a river is one of the significant pollutions ruining the river water quality.Two estuary rivers with natural mangrove wetlands developing on their banks,which are few in Guangzhou area,were selected in this study for determining the capability of nature mangroves to decrease the soluble phosphate in the river water.Analyses of the water samples taken from the Shiziyang river downstream of a firepower station and that of Caochuancun river,indicate that(1) mangrove wetlands have a great capability to decrease the amount of soluble phosphate in river water;(2) this capability is decided by the size of the wetlands occupying the areas of a riverbed.With the same riverbed section the more size of a riverbed of a mangrove wetland occupies,the more ability it gets to reduce the soluble phosphate in the water.