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Impact of Drought on Species-Specifi...

Yi, Koong.

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Impact of Drought on Species-Specific Carbon Balance and Water Use.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Impact of Drought on Species-Specific Carbon Balance and Water Use./
Author:	Yi, Koong.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	152 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
Contained By:	Dissertations Abstracts International80-08B.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13426667
ISBN:	9780438826663

Impact of Drought on Species-Specific Carbon Balance and Water Use.
Yi, Koong.

Impact of Drought on Species-Specific Carbon Balance and Water Use. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 152 p.

Source: Dissertations Abstracts International, Volume: 80-08, Section: B.

Thesis (Ph.D.)--Indiana University, 2019.

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

Droughts are expected to occur more frequently and intensely in the future. They are predicted to have large impacts on ecosystem benefits and services. Previous work has shown that drought tends to reduce the carbon-uptake capacity of forests and make forests more vulnerable to disturbance. Therefore, improved understanding of how droughts impact carbon and water cycling is necessary. The extent to which drought affects forest functioning is governed by species-specific responses to drought. In my work, plants' strategies for managing hydrologic stress were characterized across a range of scales (from leaf to stand-level) and ecosystems distributed across the U.S. In the first chapter, I investigated how patterns in the radial profile of sap flux and reliance on hydraulic capacitance differed among species of contrasting water-use strategies growing at Morgan-Monroe State Forest, Indiana. Results showed higher sensitivity in the sap flux of isohydric species than anisohydric species, while the anisohydric species were more reliant on hydraulic capacitance. The study further revealed that failure to account for shifts in the radial profile of sap flux could introduce substantial bias in estimates of tree water-use. In the second chapter, I compared how plants of contrasting water-use strategies would balance carbon uptake and water loss (intrinsic water-use efficiency; iWUE) in response to key environmental drivers (soil moisture, vapor pressure deficit (D), CO2 concentration). The iWUE of the isohydric species was generally more sensitive to environmental change than the anisohydric species was. The results also highlighted the high influence of D on iWUE and impact of observational scales on the results. In the third chapter, variation of marginal water cost of carbon uptake (λ) in response to changing D was explored by investigating the link between iWUE and λ at 28 FLUXNET sites. The results showed variation in directional change of λ in response to D, a pattern which has been predicted by previous work but rarely demonstrated empirically. Overall, this dissertation provide answers on how plant physiological responses to soil and atmospheric dryness are coordinated across species and sites, and also suggest an approach to incorporate this interaction to theoretical frameworks of plant physiology.

ISBN: 9780438826663Subjects--Topical Terms:

516476
Ecology.

Impact of Drought on Species-Specific Carbon Balance and Water Use.
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