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Title: Above-ground net primary productivity in regenerating seasonally dry tropical forest: Contributions of rainfall, forest age and soil

Abstract

Abstract Identifying factors controlling forest productivity is critical to understanding forest‐climate change feedbacks, modelling vegetation dynamics and carbon finance schemes. However, little research has focused on productivity in regenerating tropical forests which are expanding in their fraction of global area have an order of magnitude larger carbon uptake rates relative to older forest. We examined above‐ground net primary productivity (ANPP) and its components (wood production and litterfall) over 10 years in forest plots that vary in successional age, soil characteristics and species composition using band dendrometers and litterfall traps in regenerating seasonally dry tropical forests in northwestern Costa Rica. We show that the components of ANPP are differentially driven by age and annual rainfall and that local soil variation is important. Total ANPP was explained by a combination of age, annual rainfall and soil variation. Wood production comprised 35% of ANPP on average across sites and years, and was explained by annual rainfall but not forest age. Conversely, litterfall increased with forest age and soil fertility yet was not affected by annual rainfall. In this region, edaphic variability is highly correlated with plant community composition. Thus, variation in ecosystem processes explained by soil may also be partially explained by speciesmore » composition. These results suggest that future changes in annual rainfall can alter the secondary forest carbon sink, but this effect will be buffered by the litterfall flux which varies little among years. In determining the long‐term strength of the secondary forest carbon sink, both rainfall and forest age will be critical variables to track. We also conclude that detailed understanding of local site variation in soils and plant community may be required to accurately predict the impact of changing rainfall on forest carbon uptake. Synthesis . We show that in seasonally dry tropical forest, annual rainfall has a positive relationship with the growth of above‐ground woody tissues of trees and that droughts lead to significant reductions in above‐ground productivity. These results provide evidence for climate change—carbon cycle feedbacks in the seasonal tropics and highlight the value of longitudinal data on forest regeneration.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [3]; ORCiD logo [2]
  1. Colby College, Waterville, ME (United States)
  2. University of Minnesota, Minneapolis, MN (United States)
  3. University of Notre Dame, IN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); University of Minnesota
OSTI Identifier:
1980607
Alternate Identifier(s):
OSTI ID: 1823199
Grant/Contract Number:  
SC0014363; NS000107; DEB-1053237; DE‐SC0014363
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Ecology
Additional Journal Information:
Journal Volume: 109; Journal Issue: 11; Journal ID: ISSN 0022-0477
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANPP; aboveground net primary productivity; biomass carbon; Costa Rica; forest soils; forest regeneration; seasonally dry tropical forest; succession; litterfall

Citation Formats

Becknell, Justin M., Vargas G., German, Pérez‐Aviles, Daniel, Medvigy, David, and Powers, Jennifer S. Above-ground net primary productivity in regenerating seasonally dry tropical forest: Contributions of rainfall, forest age and soil. United States: N. p., 2021. Web. doi:10.1111/1365-2745.13767.
Becknell, Justin M., Vargas G., German, Pérez‐Aviles, Daniel, Medvigy, David, & Powers, Jennifer S. Above-ground net primary productivity in regenerating seasonally dry tropical forest: Contributions of rainfall, forest age and soil. United States. https://doi.org/10.1111/1365-2745.13767
Becknell, Justin M., Vargas G., German, Pérez‐Aviles, Daniel, Medvigy, David, and Powers, Jennifer S. Tue . "Above-ground net primary productivity in regenerating seasonally dry tropical forest: Contributions of rainfall, forest age and soil". United States. https://doi.org/10.1111/1365-2745.13767. https://www.osti.gov/servlets/purl/1980607.
@article{osti_1980607,
title = {Above-ground net primary productivity in regenerating seasonally dry tropical forest: Contributions of rainfall, forest age and soil},
author = {Becknell, Justin M. and Vargas G., German and Pérez‐Aviles, Daniel and Medvigy, David and Powers, Jennifer S.},
abstractNote = {Abstract Identifying factors controlling forest productivity is critical to understanding forest‐climate change feedbacks, modelling vegetation dynamics and carbon finance schemes. However, little research has focused on productivity in regenerating tropical forests which are expanding in their fraction of global area have an order of magnitude larger carbon uptake rates relative to older forest. We examined above‐ground net primary productivity (ANPP) and its components (wood production and litterfall) over 10 years in forest plots that vary in successional age, soil characteristics and species composition using band dendrometers and litterfall traps in regenerating seasonally dry tropical forests in northwestern Costa Rica. We show that the components of ANPP are differentially driven by age and annual rainfall and that local soil variation is important. Total ANPP was explained by a combination of age, annual rainfall and soil variation. Wood production comprised 35% of ANPP on average across sites and years, and was explained by annual rainfall but not forest age. Conversely, litterfall increased with forest age and soil fertility yet was not affected by annual rainfall. In this region, edaphic variability is highly correlated with plant community composition. Thus, variation in ecosystem processes explained by soil may also be partially explained by species composition. These results suggest that future changes in annual rainfall can alter the secondary forest carbon sink, but this effect will be buffered by the litterfall flux which varies little among years. In determining the long‐term strength of the secondary forest carbon sink, both rainfall and forest age will be critical variables to track. We also conclude that detailed understanding of local site variation in soils and plant community may be required to accurately predict the impact of changing rainfall on forest carbon uptake. Synthesis . We show that in seasonally dry tropical forest, annual rainfall has a positive relationship with the growth of above‐ground woody tissues of trees and that droughts lead to significant reductions in above‐ground productivity. These results provide evidence for climate change—carbon cycle feedbacks in the seasonal tropics and highlight the value of longitudinal data on forest regeneration.},
doi = {10.1111/1365-2745.13767},
journal = {Journal of Ecology},
number = 11,
volume = 109,
place = {United States},
year = {Tue Aug 17 00:00:00 EDT 2021},
month = {Tue Aug 17 00:00:00 EDT 2021}
}

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