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Tropical forest dynamics in unstable terrain: a case study from New Guinea

Published online by Cambridge University Press:  25 April 2018

John B. Vincent ,
Benjamin L. Turner ,
Clant Alok ,
Vojtech Novotny ,
George D. Weiblen  and
Timothy J. S. Whitfeld Open the ORCID record for Timothy J. S. Whitfeld [Opens in a new window]
John B. Vincent
Affiliation:
Department of Plant and Microbial Biology, University of Minnesota, 140 Gortner Laboratory, 1479 Gortner Avenue, St. Paul, Minnesota 55108, USA
Benjamin L. Turner
Affiliation:
Smithsonian Tropical Research Institute, Apartado 0843–03092, Balboa, Ancon, Republic of Panama
Clant Alok
Affiliation:
New Guinea Binatang Research Center, P. O. Box 604, Madang, Papua New Guinea
Vojtech Novotny
Affiliation:
Faculty of Science, University of South Bohemia in Ceske Budejovice, Branisovska 31, 37005, Ceske Budejovice, Czech Republic Biology Centre, The Czech Academy of Sciences, Branisovska 31, 37005, Ceske Budejovice, Czech Republic
George D. Weiblen
Affiliation:
Department of Plant and Microbial Biology, University of Minnesota, 140 Gortner Laboratory, 1479 Gortner Avenue, St. Paul, Minnesota 55108, USA
Timothy J. S. Whitfeld*
Affiliation:
Department of Ecology and Evolutionary Biology, Brown University, 34 Olive Street, Box G-B225, Providence, Rhode Island 02912, USA
*
*Corresponding author. Email: [email protected]
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Abstract:

Long-term forest dynamics plots in the tropics tend to be situated on stable terrain. This study investigated forest dynamics on the north coast of New Guinea where active subduction zones are uplifting lowland basins and exposing relatively young sediments to rapid weathering. We examined forest dynamics in relation to disturbance history, topography and soil nutrients based on partial re-census of the 50-ha Wanang Forest Dynamics Plot in Papua New Guinea. The plot is relatively high in cations and phosphorus but low in nitrogen. Soil nutrients and topography accounted for 29% of variation in species composition but only 4% of variation in basal area. There were few areas of high biomass and most of the forest was comprised of small-diameter stems. Approximately 18% of the forest was less than 30 y old and the annual tree mortality rate of nearly 4% was higher than in other tropical forests in South-East Asia and the neotropics. These results support the reputation of New Guinea's forests as highly dynamic, with frequent natural disturbance. Empirical documentation of this hypothesis expands our understanding of tropical forest dynamics and suggests that geomorphology might be incorporated in models of global carbon storage especially in regions of unstable terrain.

Keywords

diversitylowland rain forestmortalityrecruitmentsoilstrees
Type
Research Article
Information
Journal of Tropical Ecology , Volume 34 , Issue 3 , May 2018 , pp. 157 - 175
Creative Commons
This is a work of the U.S. Government and is not subject to copyright protection in the United States.
Copyright
Copyright © Cambridge University Press 2018

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References

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