Changes in the water, soil, and vegetation of a wetland after a decade of receiving a sewage effluent.

摘要: The impact of discharging an oxidation pond effluent into a wetland in the Waitangi Forest (Northland) was assessed by comparing water, soil, and vegetation this (the sewage wetland) with that adjacent not receiving reference wetland). hydroperiod two wetlands differs markedly now permanently flooded whereas is subject to summer drawdown. Marked differences were found gross chemical indicators such as pH redox potential between soils 2 wetlands. Extreme also nutrient chemistry related water chemistry. This especially case for plant available forms nitrogen phosphorus. Typically soil contained ammonium inorganic phosphorus orders magnitude greater than wetland. Major noted communities sedge Eleocharis sphacelata bulrush Typha orientalis dominated covering large part wetland, much more diverse Baumea-Isachne grassy community. Historical information indicated had similar hydrological, chemical, botanical characteristics before discharge commenced. It concluded most community changes have occurred may be interpreted terms allogenic succession but future will strong autogenic component.