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Title: Windthrows increase soil carbon stocks in a central Amazon forest

Journal Article · · Biogeosciences (Online)
 [1];  [2];  [3];  [4];  [5];  [1];  [1];  [1];  [1]
  1. Inst. Nacional de Pesquisas da Amazonia, Manaus (Brazil). Lab. de Manejo Florestal
  2. Inst. Nacional de Pesquisas da Amazonia, Manaus (Brazil). Lab. de Manejo Florestal; Max Planck Society, Jena (Germany). Max Planck Inst. for Biogeochemistry, Biogeochemical Processes Dept.; Univ. Leipzig (Germany). AG Spezielle Botanik und Funktionelle Biodiversitat
  3. Max Planck Society, Jena (Germany). Max Planck Inst. for Biogeochemistry, Biogeochemical Processes Dept.
  4. Centro de Energia Nuclear na Agricultura, Piracicaba (Brazil)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate Sciences Dept.

Windthrows change forest structure and species composition in central Amazon forests. However, the effects of widespread tree mortality associated with wind disturbances on soil properties have not yet been described in this vast region. We investigated short-term effects (7 years after disturbance) of widespread tree mortality caused by a squall line event from mid-January of 2005 on soil carbon stocks and concentrations in a central Amazon terra firme forest. The soil carbon stock (averaged over a 0–30 cm depth profile) in disturbed plots (61.4 ± 8.2 Mg ha-1, mean ±95 % confidence interval) was marginally higher (p = 0.09) than that from undisturbed plots (47.7 ± 13.6 Mg ha-1). The soil organic carbon concentration in disturbed plots (2.0 ± 0.17 %) was significantly higher (p < 0.001) than that from undisturbed plots (1.36 ± 0.24 %). Moreover, soil carbon stocks were positively correlated with soil clay content (r2 = 0.332, r = 0.575 and p = 0.019) and with tree mortality intensity (r2 = 0.257, r = 0.506 and p = 0.045). Our results indicate that large inputs of plant litter associated with large windthrow events cause a short-term increase in soil carbon content, and the degree of increase is related to soil clay content and tree mortality intensity. The higher carbon content and potentially higher nutrient availability in soils from areas recovering from windthrows may favor forest regrowth and increase vegetation resilience.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1377414
Journal Information:
Biogeosciences (Online), Vol. 13, Issue 4; ISSN 1726-4189
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Contrasting patterns of carbon sequestration between Gilbertiodendron dewevrei monodominant forests and Scorodophloeus zenkeri mixed forests in the Central Congo basin journal December 2016
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