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

The effects of global change on the ...

Herbert, Ellen R.

Linked to FindBook

Google Book

Amazon

博客來

The effects of global change on the fate of soil organic matter in tidal freshwater wetlands.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effects of global change on the fate of soil organic matter in tidal freshwater wetlands./
Author:	Herbert, Ellen R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	248 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
Contained By:	Dissertation Abstracts International77-01B(E).
Subject:	Environmental science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3722870
ISBN:	9781339052700

The effects of global change on the fate of soil organic matter in tidal freshwater wetlands.
Herbert, Ellen R.

The effects of global change on the fate of soil organic matter in tidal freshwater wetlands. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 248 p.

Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.

Thesis (Ph.D.)--Indiana University, 2015.

Tidal wetlands are sentinel ecosystems for environmental change and human-induced degradation of natural systems. They have existed in a state of equilibrium with sea level rise (SLR) over the past 4,000 years by accumulating soil organic matter (SOM) produced by plants and trapping mineral sediment. Accumulation of SOM is controlled by the balance between plant productivity and decomposition. Both processes are susceptible to anthropogenic disturbance, including salinization caused by declining freshwater flows, eutrophication from fertilizer runoff, or accelerated SLR. I utilized field measurements and a stable-isotope tracer approach to examine how anthropogenic disturbances alter SOM through the direct effects of changes on microbial metabolism and the indirect effects mediated through changes in plant communities. Increased salinity and eutrophication accelerate microbial mineralization of organic matter by providing more energetically efficient metabolic pathways, sulfate reduction (salinity) and nitrate reduction (eutrophication). However, the microbial response is dwarfed by changes in plant productivity and biomass allocation. Salinity and eutrophication reduce total root biomass and allocation of carbon to the rooting zone. Incorporating the observed biogeochemical changes into models of marsh geomorphology reveals that increased salinity reduces the contribution of SOM to vertical accretion and reduces marsh resiliency to accelerated SLR. These results highlight the importance of the complex interactions between plant productivity, microbial activity, and geomorphic processes in tidal wetland landscapes. Because tidal wetlands integrate impacts to both freshwater and marine systems, their survival depends on maintaining the integrity in the continuum of landscapes from the headwaters of rivers to the ocean.

ISBN: 9781339052700Subjects--Topical Terms:

677245
Environmental science.

The effects of global change on the fate of soil organic matter in tidal freshwater wetlands.
LDR:02795nmm a2200301 4500 001 2121124
005 20170724102949.5
008 180830s2015 ||||||||||||||||| ||eng d
020 $a 9781339052700
035 $a (MiAaPQ)AAI3722870
035 $a AAI3722870
040 $a MiAaPQ $c MiAaPQ
100 1 $a Herbert, Ellen R. $3 3283117
245 1 4 $a The effects of global change on the fate of soil organic matter in tidal freshwater wetlands.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2015
300 $a 248 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
500 $a Adviser: Christopher B. Craft.
502 $a Thesis (Ph.D.)--Indiana University, 2015.
520 $a Tidal wetlands are sentinel ecosystems for environmental change and human-induced degradation of natural systems. They have existed in a state of equilibrium with sea level rise (SLR) over the past 4,000 years by accumulating soil organic matter (SOM) produced by plants and trapping mineral sediment. Accumulation of SOM is controlled by the balance between plant productivity and decomposition. Both processes are susceptible to anthropogenic disturbance, including salinization caused by declining freshwater flows, eutrophication from fertilizer runoff, or accelerated SLR. I utilized field measurements and a stable-isotope tracer approach to examine how anthropogenic disturbances alter SOM through the direct effects of changes on microbial metabolism and the indirect effects mediated through changes in plant communities. Increased salinity and eutrophication accelerate microbial mineralization of organic matter by providing more energetically efficient metabolic pathways, sulfate reduction (salinity) and nitrate reduction (eutrophication). However, the microbial response is dwarfed by changes in plant productivity and biomass allocation. Salinity and eutrophication reduce total root biomass and allocation of carbon to the rooting zone. Incorporating the observed biogeochemical changes into models of marsh geomorphology reveals that increased salinity reduces the contribution of SOM to vertical accretion and reduces marsh resiliency to accelerated SLR. These results highlight the importance of the complex interactions between plant productivity, microbial activity, and geomorphic processes in tidal wetland landscapes. Because tidal wetlands integrate impacts to both freshwater and marine systems, their survival depends on maintaining the integrity in the continuum of landscapes from the headwaters of rivers to the ocean.
590 $a School code: 0093.
650 4 $a Environmental science. $3 677245
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Ecology. $3 516476
690 $a 0768
690 $a 0404
690 $a 0329
710 2 $a Indiana University. $b Environmental Science. $3 1269380
773 0 $t Dissertation Abstracts International $g 77-01B(E).
790 $a 0093
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3722870