東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Assessment of Agricultural Nutrient ...

Saltos, Theodore Nicholas.

FindBook

Google Book

Amazon

博客來

Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach./
作者:	Saltos, Theodore Nicholas.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	255 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-06, Section: B.
Contained By:	Dissertations Abstracts International80-06B.
標題:	Environmental economics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=11011158
ISBN:	9780438650060

Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach.
Saltos, Theodore Nicholas.

Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 255 p.

Source: Dissertations Abstracts International, Volume: 80-06, Section: B.

Thesis (Ph.D.)--The Ohio State University, 2018.

This item must not be sold to any third party vendors.

The deterioration of Lake Erie water quality over the last two decades, despite improvements that occurred in the 1980s and early 1990s, has caused an increasing trend in the presence of harmful algal blooms. In this study, changes in the relationship between weather and water and nutrient discharges over time are investigated for the Maumee and Sandusky watersheds, using extensive historical data in statistical models that relate water discharge (flow) and nutrient concentrations to lagged-precipitation and temperature, seasonality, and annual fixed-effects. In Chapter 1, differences in weather effects on flow between three periods that correlate with shifts in water quality trends,1960-1979, 1980-1995, and 1996-2015, are analyzed. Findings indicate a faster flow response to precipitation during 1996-2015 as compared to the previous two periods, and that part of the increase in flow over time is related to factors other than precipitation. The model is also used to assess period-averaged contributions to flow associated with precipitation lag times. It was found that, while short lag time contributions decreased during 1980-1995, they increased significantly during the 1996-2015 period, following same trend as Lake Erie water quality. These results suggest a need to implement a nutrient management strategy that goes beyond the currently adopted best management practices (BMPs). In Chapter 2, differences in the weather effects on nutrient concentration and load between two periods that correlate with shifts in water quality trends, 1980-1995, and 1996-2015, are analyzed. The investigated nutrients are attached phosphorus, soluble reactive phosphorus (SRP), total Kjeldahl nitrogen, and nitrite/nitrate-nitrogen. The model also includes economic variables which are used to analyze the effectiveness of economic policies for nutrient management. Major findings include (1) the large and statistically significant increase in SRP concentration and load response to precipitation during the 1996-2015 period as compared to the 1980-1995 period, and (2) the moderate effectiveness of a fertilizer tax policy for nutrient management. The results indicate that both nutrient input reduction and controlled drainage may be needed to reduce and control short and long-term nutrient loading. In Chapter 3, the flow and nutrient concentration models are used to investigate the effects of anthropogenic factors on flow and nutrient concentration over time, such as subsurface drainage, independently of weather. Similar rain patterns are identified and matched sets of similar sized events for the two watersheds are developed. Major findings are (1) the flow response to precipitation, when controlling for changes in weather over time, is faster for events in the interval 0.75 - 1 in. at both watersheds, and (2) the SRP concentration response to precipitation at the Maumee watershed is faster for events in the interval 0.75 - 1 in. while at the Sandusky watershed it is faster in the interval 0.5 - 0.75. These findings indicate that factors such as subsurface drainage capacity and conservation tillage may have increased over time and suggest the need to focus on management practices that store more water in the landscape, and to continue the implementation of other BMPs such as subsurface placement of phosphorus fertilizer.

ISBN: 9780438650060Subjects--Topical Terms:

535179
Environmental economics.

Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach.
LDR:04686nmm a2200361 4500 001 2210652
005 20191121124252.5
008 201008s2018 ||||||||||||||||| ||eng d
020 $a 9780438650060
035 $a (MiAaPQ)AAI11011158
035 $a (MiAaPQ)OhioLINK:osu1531928517302473
035 $a AAI11011158
040 $a MiAaPQ $c MiAaPQ
100 1 $a Saltos, Theodore Nicholas. $3 3437790
245 1 0 $a Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 255 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-06, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Sohngen, Brent.
502 $a Thesis (Ph.D.)--The Ohio State University, 2018.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The deterioration of Lake Erie water quality over the last two decades, despite improvements that occurred in the 1980s and early 1990s, has caused an increasing trend in the presence of harmful algal blooms. In this study, changes in the relationship between weather and water and nutrient discharges over time are investigated for the Maumee and Sandusky watersheds, using extensive historical data in statistical models that relate water discharge (flow) and nutrient concentrations to lagged-precipitation and temperature, seasonality, and annual fixed-effects. In Chapter 1, differences in weather effects on flow between three periods that correlate with shifts in water quality trends,1960-1979, 1980-1995, and 1996-2015, are analyzed. Findings indicate a faster flow response to precipitation during 1996-2015 as compared to the previous two periods, and that part of the increase in flow over time is related to factors other than precipitation. The model is also used to assess period-averaged contributions to flow associated with precipitation lag times. It was found that, while short lag time contributions decreased during 1980-1995, they increased significantly during the 1996-2015 period, following same trend as Lake Erie water quality. These results suggest a need to implement a nutrient management strategy that goes beyond the currently adopted best management practices (BMPs). In Chapter 2, differences in the weather effects on nutrient concentration and load between two periods that correlate with shifts in water quality trends, 1980-1995, and 1996-2015, are analyzed. The investigated nutrients are attached phosphorus, soluble reactive phosphorus (SRP), total Kjeldahl nitrogen, and nitrite/nitrate-nitrogen. The model also includes economic variables which are used to analyze the effectiveness of economic policies for nutrient management. Major findings include (1) the large and statistically significant increase in SRP concentration and load response to precipitation during the 1996-2015 period as compared to the 1980-1995 period, and (2) the moderate effectiveness of a fertilizer tax policy for nutrient management. The results indicate that both nutrient input reduction and controlled drainage may be needed to reduce and control short and long-term nutrient loading. In Chapter 3, the flow and nutrient concentration models are used to investigate the effects of anthropogenic factors on flow and nutrient concentration over time, such as subsurface drainage, independently of weather. Similar rain patterns are identified and matched sets of similar sized events for the two watersheds are developed. Major findings are (1) the flow response to precipitation, when controlling for changes in weather over time, is faster for events in the interval 0.75 - 1 in. at both watersheds, and (2) the SRP concentration response to precipitation at the Maumee watershed is faster for events in the interval 0.75 - 1 in. while at the Sandusky watershed it is faster in the interval 0.5 - 0.75. These findings indicate that factors such as subsurface drainage capacity and conservation tillage may have increased over time and suggest the need to focus on management practices that store more water in the landscape, and to continue the implementation of other BMPs such as subsurface placement of phosphorus fertilizer.
590 $a School code: 0168.
650 4 $a Environmental economics. $3 535179
650 4 $a Agriculture. $3 518588
650 4 $a Environmental management. $3 535182
650 4 $a Environmental science. $3 677245
690 $a 0438
690 $a 0473
690 $a 0474
690 $a 0768
710 2 $a The Ohio State University. $b Environmental Science. $3 1676894
773 0 $t Dissertations Abstracts International $g 80-06B.
790 $a 0168
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=11011158