PURPOSE: This technical note provides a procedural framework for evaluating the economic values of wetlands. Important economic concepts on supply/demand and valuation are presented as they relate to the economic valuea supported or provided by wetlands. The framework presented here can be used to evaluate economic values within the Section 404 process, while recognizhg the difficulties of wetl...

Intertidal wetlands such as saltmarshes and mangroves provide numerous important ecological functions, though they are in rapid and global decline. To better conserve and restore these wetland ecosystems, we need an understanding of the fundamental natural bottlenecks and thresholds to their establishment and long-term ecological maintenance. Despite inhabiting similar intertidal positions, the...

Introduct ion .................................................................................................................................... 3 1 1 Carbon Cycling in Forested Wetland So i l s .................................................................................. .3 12 Carbon Fluxes Inputs .............................................................................................

Wetlands in West Africa are among the most vulnerable ecosystems to climate change. West African wetlands are often freshwater transfer mechanisms from wetter climate regions to dryer areas, providing an array of ecosystem services and functions. Often wetland-specific data in Africa is only available on a per country basis or as point data. Since wetlands are challenging to map, their accuraci...

A lot of wetlands exist in the Yellow River Delta area, Shandong China and exhibit significance for the delta ecological environmental evolution and animal habitat protection. It is important for wetland protection and management to accurately map the wetland distribution by remote sensing due to the fact that the estuary area changes very fast. This study tries to combine subpixel analysis of ...

introduction hoor-al-azim wetland is one of the most important wildlife refuges and marine ecosystems in the south-west of iran where structure and function has been significantly affected by different changes during the 2 recent decades. changes in water regime of hoor-al-azim wetland and human activities are some of the most important factors. changes in water regime and anthropogenic activit...

An assessment of wetland nature reserves and the protection of China’s vertebrate diversity.— We assessed 148 wetland nature reserves in China and the distribution of the four taxa of endemic and threatened terrestrial vertebrates, reptiles, amphibians, birds and mammals. Assessment of the wetland nature reserves was combined with the governmental list of the endemic and threatened vertebrates ...

A horizontal subsurface flow constructed wetland was investigated after eight years of residential wastewater discharge (150 person equivalents). Twenty core samples distributed over the entire wetland were taken from the soil matrix. The distribution pattern of phosphorus (P) accumulation in the substrate of the wetland was determined using kriging technique and P sorption was related to the c...

Historically isolated wetland ecosystems may provide a phosphorus (P) storage sink for runoff from agricultural pastures. Four historically isolated wetlands were characterized on two cow-calf ranches in the Lake Okeechobee Basin, Florida, to (i) quantify P storage in ecosystem compartments (plant biomass, litter, and soil) of historically isolated wetlands and surrounding improved pasture upla...

Velocity heterogeneity is often present in wetland systems and results in some influent water remaining in the wetland for less than the expected residence time. This phenomenon, known as short-circuiting, alters the distribution of the chemical and biological transformations that occur within the wetland and decreases performance in constructed treatment wetlands. In this thesis, field observa...