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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Estimating recreational value of water quality in Mississippi lakes when water quality data are scarceKelsoe, Caroline 09 August 2019 (has links)
In its 2012 National Lakes Assessment, the EPA determined that nutrients are the most widespread stressor of US Lakes, with one-third of US lakes containing excess nitrogen and/or phosphorus. In response, states are developing numeric nutrient criteria to regulate the allowable amount of nutrients in surface waterbodies. In this study, we estimate the recreational value of improved water quality as a result of reduced nutrients in Mississippi lakes using a travel cost model. A major challenge, however, is the lack of water quality data for many Mississippi lakes. We introduce a water quality prediction model to impute water quality measures for lakes that lack water quality data. We compare welfare estimates from travel cost models based on the limited available water quality data to models using predicted water quality measures to evaluate the extent to which inadequate data affects welfare estimates for improved water quality.
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Soil chemical and biological changes through the N2 fixation of black locust (Robinia pseudoacacia L.) - A contribution to the research of tree neophytes / Bodenchemische und -biologische Veränderungen durch die N-Fixierung der Robinie (Robinia pseudoacacia L.) - Ein Beitrag zur Erforschung von BaumneophytenBerthold, Dirk 29 July 2005 (has links)
No description available.
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