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What Is Greening? An Exploration of ...

Wong, Russell Everett.

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What Is Greening? An Exploration of Vegetation Change Across Northwest Alaska in the Context of Satellite Observations.

Record Type:	Electronic resources : Monograph/item
Title/Author:	What Is Greening? An Exploration of Vegetation Change Across Northwest Alaska in the Context of Satellite Observations./
Author:	Wong, Russell Everett.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	105 p.
Notes:	Source: Masters Abstracts International, Volume: 85-11.
Contained By:	Masters Abstracts International85-11.
Subject:	Ecology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31240104
ISBN:	9798382456225

What Is Greening? An Exploration of Vegetation Change Across Northwest Alaska in the Context of Satellite Observations.
Wong, Russell Everett.

What Is Greening? An Exploration of Vegetation Change Across Northwest Alaska in the Context of Satellite Observations. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 105 p.

Source: Masters Abstracts International, Volume: 85-11.

Thesis (M.S.E.S.)--Alaska Pacific University, 2024.

Satellite-borne observations detect widespread greening, suggesting a boreal biome shift may be underway. However, without extensive ground-truthing matched to the scale of satellite scenes, it is difficult to differentiate greening of extant vegetation from greening associated with changes in plant composition. Chapter 1 describes "pixel-walking", a novel method to improve ecological interpretation of remotely sensed vegetation greenness measurements that involved sampling >24,000 Landsat pixels (30 m) across >600 km of Alaska's central Brooks Range. The example dataset illustrates that, along the boreal-Arctic boundary, vegetation with the greatest Landsat Normalized Difference Vegetation Index (NDVI) is taller than one meter, woody, and deciduous, whereas vegetation with lower NDVI tends to be shorter, evergreen, or non-woody. The field methods and associated analyses advance efforts to inform satellite data with ground-based vegetation observations using field samples collected at spatial scales more closely matching the resolution of remotely-sensed imagery. Chapter 2 extends the pixel-walking to address what is greening? Here, >1,000 km of field-based transects sampling >35,000 Landsat pixels across northwest Alaska, provides estimates of greening rates for vegetative communities, inference of how communities have greened over time, and calculations of how much each community type contributes to greening. Boreal shrub communities greened most rapidly, while tundra communities greened more slowly, with boreal shrubs growing over tundra plants contributing most to greening overall. Importantly, one third of greening pixels demonstrated shifts in greenness consistent with compositional change. Our analysis of field transects attribute much of the greening to tall deciduous shrub proliferation, a vegetation change with important consequences for wildlife habitat, subsistence communities, and the global climate system.

ISBN: 9798382456225Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Alaska

What Is Greening? An Exploration of Vegetation Change Across Northwest Alaska in the Context of Satellite Observations.
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520 $a Satellite-borne observations detect widespread greening, suggesting a boreal biome shift may be underway. However, without extensive ground-truthing matched to the scale of satellite scenes, it is difficult to differentiate greening of extant vegetation from greening associated with changes in plant composition. Chapter 1 describes "pixel-walking", a novel method to improve ecological interpretation of remotely sensed vegetation greenness measurements that involved sampling >24,000 Landsat pixels (30 m) across >600 km of Alaska's central Brooks Range. The example dataset illustrates that, along the boreal-Arctic boundary, vegetation with the greatest Landsat Normalized Difference Vegetation Index (NDVI) is taller than one meter, woody, and deciduous, whereas vegetation with lower NDVI tends to be shorter, evergreen, or non-woody. The field methods and associated analyses advance efforts to inform satellite data with ground-based vegetation observations using field samples collected at spatial scales more closely matching the resolution of remotely-sensed imagery. Chapter 2 extends the pixel-walking to address what is greening? Here, >1,000 km of field-based transects sampling >35,000 Landsat pixels across northwest Alaska, provides estimates of greening rates for vegetative communities, inference of how communities have greened over time, and calculations of how much each community type contributes to greening. Boreal shrub communities greened most rapidly, while tundra communities greened more slowly, with boreal shrubs growing over tundra plants contributing most to greening overall. Importantly, one third of greening pixels demonstrated shifts in greenness consistent with compositional change. Our analysis of field transects attribute much of the greening to tall deciduous shrub proliferation, a vegetation change with important consequences for wildlife habitat, subsistence communities, and the global climate system.
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