Effects of Sewage Discharge on Soil and Plants of the Mangrove Wetland Ecosystem

Abstract

Abstract: In order to study the feasibility of using mangrove wetland as a facility for sewage treatment and the effects of wastewater discharge on soil and plants of the mangrove ecosystem,the field work was conducted during December 1994 to December 1995 in a mangrove wetland in Futian national nature reserve in Shenzhen. Two parallel elongated sites (sites A and B, each 180m?10m) stretching from land to sea were chosen for study. Since December 1994, Site A was continuously irrigated with municipal sewage every two days,while Site Bserved as a control. The ecological impact of sewage discharge on the mangrove wetland was assessed by comparing the plant growth, nutrients of soils and vegetation between Site Aand Site B. One year later, total-N and NH₄⁺-N in the soil increased and ECdecreased significantly at Site A. And obvious changes in pHvalue and other nutrient contents in the soil of Site A could be detected. However, the nutrient contents of the leaves of the dominant plants collected from Site Aand Bwere very close and no significant difference in terms of tree height and diameter and biomass was found between the two sites.

Key words: potential evapotranspiration, Hurst index, Penman-Monteith, five provinces in Northwest China.

Huang Linan, Lan Chongyu, Shu Wensheng. Effects of Sewage Discharge on Soil and Plants of the Mangrove Wetland Ecosystem[J]. cje, 2000, (2): 13-19.

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