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Quantifying The Impact Of Urbanization On N And P Inputs, Transformations, Removal And Fluxes In Watersheds Draining To The Plum Island Estuary, Nathaniel Burr Morse
Quantifying The Impact Of Urbanization On N And P Inputs, Transformations, Removal And Fluxes In Watersheds Draining To The Plum Island Estuary, Nathaniel Burr Morse
Doctoral Dissertations
A five-fold global urban population increase over the last century is driving global land use change and causing coastal eutrophication and dead zones. This dissertation was designed to better understand how suburbanization in the Ipswich and Parker River watersheds, the two major rivers draining to the Plum Island Estuary, affects nutrient loading the Plum Island Estuary. I used an almost 17-year long-term nutrient record to test whether ongoing watershed suburbanization has affected net fluxes of nutrients to the Plum Island Estuary over the study period. Additionally, I paired this long-term study with spatial sampling of headwater watersheds across a range …
Vegetation Influences On The Ebullition Of Methane In A Temperate Wetland, Samantha Roddy
Vegetation Influences On The Ebullition Of Methane In A Temperate Wetland, Samantha Roddy
Master's Theses and Capstones
Ebullition, or bubbling, is one pathway of methane (CH4) emission to the atmosphere from wetland ecosystems. Rates of ebullition vary spatially and temporally according to dominant vegetation type, peat density and time of year or season. We studied the continuous and episodic nature of ebullition and how it varies with species composition using six acoustic and manual sensors deployed in a temperate wetland, Sallie's Fen, Barrington, NH, in 2011 and 2012. Six additional sensors were installed in June 2013 and all sensors ran from typically June to October. A subsample of the manual bubble collections at each sensor was analyzed …
Effects Of Discharge In Residence Time Distributions In A Small Headwaters Wetland In The Ipswich River Watershed, Katherine D. Lawrence
Effects Of Discharge In Residence Time Distributions In A Small Headwaters Wetland In The Ipswich River Watershed, Katherine D. Lawrence
Master's Theses and Capstones
The Ipswich River Watershed, a 401 km2 watershed located in northeastern Massachusetts, has been observed to be undergoing increasing urbanization with resulting increases in nutrient loading, in particular, nitrogen. Nitrogen uptake occurs in a 1st-order process which is dependent on the concentration of nitrogen as well as the amount of time the water containing nitrogen remains within the wetland, which is described as the residence time distribution (RTD). To better understand how discharge affects the RTD of the wetland, a number of tracer studies were conducted between May 2011 and August 2011. Additionally, fluxes into and out of the wetland …