Cultural Eutrophication And Its Effects On The Environment

1996 Words8 Pages
Human activities continue to increase the amounts of carbon, nitrogen and phosphorus entering lakes and this may result in serious environmental and human health problems (Chen et al., 2015). Fossil fuel combustion, economic development, the use of pesticides and fertilizers, the increased demand for carbon, nitrogen and phosphorus in human activities, and land-use changes all have a significant impact on transforming carbon, nitrogen and phosphorus cycles (Chen et al., 2015). These changes are bringing serious environmental threats such as global warming, biodiversity decline, air pollution, eutrophication and water quality deterioration (Chen et al., 2015). Specifically, the primary water quality issue for freshwater and coastal marine ecosystems in the world has become known as cultural eutrophication (Smith et al., 2009). Cultural eutrophication is the nutrient enrichment caused by human activity which leads to the promotion of aquatic plant growth such as algae blooms, and ultimately the loss of available oxygen (Nicholis et al., 1975). Several studies have reported nutrient contributions to lakes from a variety of land use practices on watersheds (Nicholis et al., 1975). Thus, nutrient loading into wetlands increases nutrient concentrations in the water in streams, rivers and lakes of that watershed (Sánchez-Carrillo et al., 2011). After prolonged exposure to high nutrient loading, it is noted that an increase of the watershed internal loading can be expected, including sediment releases (Sánchez-Carrillo et al., 2011). The agricultural impact on rivers is of primary interest for understanding the nature of the nutrients that are building up. The management of phosphorus and nitrogen in waters is critical to maintaining des... ... middle of paper ... ...s to chemically characterize the forms of phosphorus contributing to legacy phosphorus in stream sediments located in watershed streams. Legacy phosphorus is phosphorus which has accumulated in sediments due to previous human activities (Correll, 1998). To complement the research goal, this study aimed to chemically characterize the forms of phosphorus in the Holland Marsh soil that is eroding into the Holland River and leading to sediment buildup. Measurements of the pH dependence of extractable phosphorus provides a basis for predicting phosphorus releases from the inorganic phosphorus forms associated with Fe, Al and Ca. The main objective of the study was to estimate the amount and forms of phosphorus in the Holland Marsh soil using a phosphorus fractionation technique, and to evaluate their possible contributions to the phosphorus loadings of the river systems.
Open Document