東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Hydrology, Nutrient Availability, an...

Lodge, Kimberly A.

Linked to FindBook

Google Book

Amazon

博客來

Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands./
Author:	Lodge, Kimberly A.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	89 p.
Notes:	Source: Masters Abstracts International, Volume: 56-06.
Contained By:	Masters Abstracts International56-06(E).
Subject:	Aquatic sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10620336
ISBN:	9780355169140

Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands.
Lodge, Kimberly A.

Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 89 p.

Source: Masters Abstracts International, Volume: 56-06.

Thesis (M.S.)--Rochester Institute of Technology, 2017.

The loss of natural wetlands to anthropogenic development has warranted the creation of wetlands to mitigate the reduction of valuable ecosystem functions and services. However, the complex interactions between the main drivers of wetland community structure -- hydrology, nutrient availability and herbivory -- makes creation of fully functional wetland replacements challenging. In this study, we examined the interactions among these drivers, and their impacts on plant diversity and nitrogen removal in two created wetlands with different land use histories: A1N (previous gravel depository) and A3 (previous cattle pasture). We established paired plots protected from -- and open to -- large wetland grazers and compared vegetation abundance and diversity, soil characteristics, and soil respiration and potential denitrification in each wetland. At A1N, a permanently flooded emergent marsh with high observed grazer densities (predominantly waterfowl) and low nutrient availability, grazing significantly reduced plant growth and diversity. In contrast, at A3, a seasonally flooded wetland with lower grazer densities and high nutrient availability, grazing enhanced overall plant diversity and decreased invasive species cover. The effects of grazers varied seasonally and increased over time, eventually leading to a reduction in soil organic matter at both sites. In light of significant site differences, potential denitrification was limited by differential hydrology (very wet, anaerobic versus very dry, aerobic), nitrogen or carbon availability, and grazing (low or high levels) at both sites. These results suggest the possibility of long-term grazer-induced shifts in community composition and delivery of key ecosystem services in young, vulnerable created wetlands. To improve created wetland design and function, we suggest that the impact of prior land use on present nutrient availability must be considered, and sites must be heterogeneous in both physical and bathymetric structure, to provide conditions for diverse plant communities, both aerobic and anaerobic biogeochemical processes, and balanced habitat use by wetland grazers.

ISBN: 9780355169140Subjects--Topical Terms:

3174300
Aquatic sciences.

Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands.
LDR:03170nmm a2200313 4500 001 2200448
005 20190315110955.5
008 201008s2017 ||||||||||||||||| ||eng d
020 $a 9780355169140
035 $a (MiAaPQ)AAI10620336
035 $a (MiAaPQ)rit:12763
035 $a AAI10620336
040 $a MiAaPQ $c MiAaPQ
100 1 $a Lodge, Kimberly A. $3 3427197
245 1 0 $a Hydrology, Nutrient Availability, and Herbivory Interacting to Control Ecosystem Functions and Services in Created Emergent Freshwater Wetlands.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 89 p.
500 $a Source: Masters Abstracts International, Volume: 56-06.
500 $a Adviser: Anna C. Tyler.
502 $a Thesis (M.S.)--Rochester Institute of Technology, 2017.
520 $a The loss of natural wetlands to anthropogenic development has warranted the creation of wetlands to mitigate the reduction of valuable ecosystem functions and services. However, the complex interactions between the main drivers of wetland community structure -- hydrology, nutrient availability and herbivory -- makes creation of fully functional wetland replacements challenging. In this study, we examined the interactions among these drivers, and their impacts on plant diversity and nitrogen removal in two created wetlands with different land use histories: A1N (previous gravel depository) and A3 (previous cattle pasture). We established paired plots protected from -- and open to -- large wetland grazers and compared vegetation abundance and diversity, soil characteristics, and soil respiration and potential denitrification in each wetland. At A1N, a permanently flooded emergent marsh with high observed grazer densities (predominantly waterfowl) and low nutrient availability, grazing significantly reduced plant growth and diversity. In contrast, at A3, a seasonally flooded wetland with lower grazer densities and high nutrient availability, grazing enhanced overall plant diversity and decreased invasive species cover. The effects of grazers varied seasonally and increased over time, eventually leading to a reduction in soil organic matter at both sites. In light of significant site differences, potential denitrification was limited by differential hydrology (very wet, anaerobic versus very dry, aerobic), nitrogen or carbon availability, and grazing (low or high levels) at both sites. These results suggest the possibility of long-term grazer-induced shifts in community composition and delivery of key ecosystem services in young, vulnerable created wetlands. To improve created wetland design and function, we suggest that the impact of prior land use on present nutrient availability must be considered, and sites must be heterogeneous in both physical and bathymetric structure, to provide conditions for diverse plant communities, both aerobic and anaerobic biogeochemical processes, and balanced habitat use by wetland grazers.
590 $a School code: 0465.
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Ecology. $3 516476
650 4 $a Biogeochemistry. $3 545717
690 $a 0792
690 $a 0329
690 $a 0425
710 2 $a Rochester Institute of Technology. $b Environmental Science. $3 3183110
773 0 $t Masters Abstracts International $g 56-06(E).
790 $a 0465
791 $a M.S.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10620336