Net primary productivity allocation and cycling of carbon along a tropical forest elevational transect in the Peruvian Andes

C. A.J. Girardin, Y. Malhi, L. E.O.C. Aragão, M. Mamani, W. Huaraca Huasco, L. Durand, K. J. Feeley, J. Rapp, J. E. Silva-Espejo, M. Silman, N. Salinas, R. J. Whittaker

Research output: Contribution to journalArticle

207 Scopus citations

Abstract

The net primary productivity, carbon (C) stocks and turnover rates (i.e. C dynamics) of tropical forests are an important aspect of the global C cycle. These variables have been investigated in lowland tropical forests, but they have rarely been studied in tropical montane forests (TMFs). This study examines spatial patterns of above- and belowground C dynamics along a transect ranging from lowland Amazonia to the high Andes in SE Peru. Fine root biomass values increased from 1.50MgCha-1 at 194m to 4.95 ± 0.62MgCha-1 at 3020m, reaching a maximum of 6.83 ± 1.13MgCha-1 at the 2020m elevation site. Aboveground biomass values decreased from 123.50MgCha-1 at 194m to 47.03MgCha-1 at 3020m. Mean annual belowground productivity was highest in the most fertile lowland plots (7.40 ± 1.00MgCha-1yr-1) and ranged between 3.43 ± 0.73 and 1.48 ± 0.40MgCha-1yr-1 in the premontane and montane plots. Mean annual aboveground productivity was estimated to vary between 9.50 ± 1.08MgCha-1yr-1 (210m) and 2.59 ± 0.40MgCha-1yr-1 (2020m), with consistently lower values observed in the cloud immersion zone of the montane forest. Fine root C residence time increased from 0.31 years in lowland Amazonia to 3.78 ± 0.81 years at 3020m and stem C residence time remained constant along the elevational transect, with a mean of 54 ± 4 years. The ratio of fine root biomass to stem biomass increased significantly with increasing elevation, whereas the allocation of net primary productivity above- and belowground remained approximately constant at all elevations. Although net primary productivity declined in the TMF, the partitioning of productivity between the ecosystem subcomponents remained the same in lowland, premontane and montane forests.

Original languageEnglish (US)
Pages (from-to)3176-3192
Number of pages17
JournalGlobal Change Biology
Volume16
Issue number12
DOIs
StatePublished - Dec 2010

Keywords

  • Amazon basin
  • Andes
  • Carbon
  • Carbon stocks
  • Ecophysiology
  • Elevational gradient
  • Net primary productivity
  • Residence time
  • Soil water content
  • Temperature
  • Tropical montane forests

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

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    Girardin, C. A. J., Malhi, Y., Aragão, L. E. O. C., Mamani, M., Huaraca Huasco, W., Durand, L., Feeley, K. J., Rapp, J., Silva-Espejo, J. E., Silman, M., Salinas, N., & Whittaker, R. J. (2010). Net primary productivity allocation and cycling of carbon along a tropical forest elevational transect in the Peruvian Andes. Global Change Biology, 16(12), 3176-3192. https://doi.org/10.1111/j.1365-2486.2010.02235.x