Abstract/Details

Global environmental change: What are the impacts of climate change and land cover change on different ecosystems?


2000 2000

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Abstract (summary)

This research incorporates the technologies of climate modeling, vegetation modeling, remote sensing and Geographic Information Systems analyses to monitor changes in land cover across the Midwestern United States, Western Honduras, and the Yucatan Peninsula. These changes in land cover are due to human impacts such as deforestation and reforestation (Honduras and Mexico), and also are due to climate change impacts as modeled for 2050 (Midwestern United States). The overall objective of this research is to understand more fully the processes and potential impacts of land cover change and future climate change on both managed and natural terrestrial ecosystems.

The potential impacts of future climate change, for the 2050s, across the Midwestern United States, are for decreased maize yields across the southern portions of the study area, and increased yields across the northern areas. The high summer maximum temperatures inhibit maize growth above temperatures of 35°C, which become more frequent across southern areas of the study region. In addition increases in climate variability results in decreased maize yields and CO2 fertilization for maize, a C4 crop, is limited. For forested regions potential climate change under a doubled CO2 climate results in an overall shift in forest composition from a transitional oak-hickory and beech-maple composition to a predominantly oak-hickory forest. In addition northern conifers and northern deciduous species were almost completely extirpated from the study region.

Land cover, specifically forest cover, changes across the study region of western Honduras and eastern Guatemala, show an overall trend of deforestation between 1987 and 1996. However, at the smaller study area scale of La Campa, reforestation is the dominant trend. These differences relate to a ban on logging within the community, land tenure and agricultural intensification processes currently occurring in the region. Research on changes in land cover using different techniques, specifically thermal band analysis, for Yucatan, Mexico, reveals a much improved method of analysis. Using discriminant analysis it was found that land cover was significantly related to surface temperatures, and as such this provides for a potential method for determining land cover. In addition, the data derived for the land cover analysis can also be used for climate modeling of terrestrial ecosystems, and to link the terrestrial and atmospheric components of the earth system.

Indexing (details)


Subject
Environmental science;
Geophysics;
Geography
Classification
0768: Environmental science
0373: Geophysics
0368: Geography
Identifier / keyword
Health and environmental sciences, Earth sciences, Climate change, Ecosystems, Environmental change, Land cover
Title
Global environmental change: What are the impacts of climate change and land cover change on different ecosystems?
Author
Southworth, Jane
Number of pages
250
Publication year
2000
Degree date
2000
School code
0093
Source
DAI-B 61/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780493007885, 0493007881
Advisor
Randolph, J. C.
University/institution
Indiana University
University location
United States -- Indiana
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9993548
ProQuest document ID
304601066
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304601066
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