Abstract/Details

Postdisturbance recovery of aboveground biomass and nutrients in tropical temperate, and boreal forests


1999 1999

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Abstract (summary)

A number of issues in basic and applied forest ecology require an understanding of the controls on post-disturbance regrowth that result in variable rates of biomass accumulation. In this study, aboveground biomass data was compiled from chronosequence and long-term studies of secondary forests worldwide to model aboveground biomass accumulation (ABA) in forests following stand-clearing disturbances.

Regression analyses and tests for slope homogeneity indicate that soil texture influenced the ABA of broadleaf forests; broadleaf stands underlain by sandy soils exhibited slower GSDY-adjusted ABA than broadleaf stands growing on non-sandy soils. On non-sandy soils, the GSDY-adjusted ABA of tropical and non-tropical broadleaf forests was indistinguishable; as a group, tropical forests are not particularly slow to recover aboveground biomass following disturbance events. Differences in soil texture were less important for needle-leaf forests; on the whole, the GSDY-adjusted ABA of needle-leaf forests was intermediate between that of sandy and non-sandy broad-leaved forests.

The global model of forest ABA was tested by calculating rates of ABA for forests recovering from slash-and—burn cultivation on two Amazonian sites—sandy dystrophic upland (terra firme) and non-sandy eutrophic floodplain (várzea). As predicted by the global model, non-sandy várzea forests accumulated more biomass and at a faster rate than sandy terra firme forests.

Disturbance characteristics (e.g., size, severity, and frequency) may also influence ABA. The global model of ABA included only regrowth following stand-clearing disturbances. The model was applied to broadleaf and coniferous temperate montane rainforests in southern Chile to test its applicability to regrowth following less severe, patchy disturbances. ABA following gap-disturbance was highly variable, although most plots fell within the range of biomass predicted by the global model.

Indexing (details)


Subject
Ecology;
Forestry
Classification
0329: Ecology
0478: Forestry
Identifier / keyword
Biological sciences; Biomass; Boreal forests; Nutrients; Postdisturbance; Regeneration; Temperate; Tropical
Title
Postdisturbance recovery of aboveground biomass and nutrients in tropical temperate, and boreal forests
Author
Johnson, Christine May
Number of pages
155
Publication year
1999
Degree date
1999
School code
0175
Source
DAI-B 60/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599259102, 0599259108
Advisor
Johnson, Arthur H.
University/institution
University of Pennsylvania
University location
United States -- Pennsylvania
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9926146
ProQuest document ID
304518488
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304518488
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