@InProceedings{MalhiGDMGSMSSHRHAAMPFG:2015:WhCaBu,
author = "Malhi, Yadvinder and Girardin, C{\'e}cile and Doughty, Chris and
Metcalfe, Daniel and Goldsmith, Greg and Silman, Miles and Meir,
Patrick and Salinas, Norma and Silva-Espejo, Javier and Huasco,
Walter Huaraca and Rios, William Farfan and Halladay, Kate and
Am{\'e}zquita, Fililo Farf{\`a}n and Arag{\~a}o, Luiz Eduardo
Oliveira e Cruz de and Marthews, Toby R. and Phillips, Oliver L.
and Fisher, Joshua B. and Galiano-Cabrera, Darcy F.",
affiliation = "{University of Oxford} and {University of Oxford} and {University
of Oxford} and {Swedish University of Agricultural Sciences} and
{Paul Scherrer Institute} and {Wake Forest University} and
{University of Edinborough} and {University of Oxford} and
{Universidad Nacional San Antonio Abad del Cusco} and {Universidad
Nacional San Antonio Abad del Cusco} and {Universidad Nacional San
Antonio Abad del Cusco} and Met Office, Exeter and {Universidad
Nacional San Antonio Abad del Cusco} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {University of Oxford} and
{University of Leeds} and {California Institute of Technology} and
{Universidad Nacional San Antonio Abad del Cusco}",
title = "Explaining the low growth rates and biomass of tropical montane
forests: a whole carbon budget perspective",
year = "2015",
organization = "Annual Meeting of the Association for Tropical Biology and
Conservation, 52.",
abstract = "Why do tropical montane forests grow more slowly, and have lower
biomass, than tropical lowland forests? To address this question,
research to date has generally focused on correlative approaches
describing changes in growth and biomass as a function of changes
in elevation-related variables such as temperature. We present a
novel, mechanistic approach to this question by attempting to
quantify each component of the whole autotrophic carbon budget in
tropical forests along a 2800 m elevation transect in the Peruvian
Andes. We find that low growth rates at high elevations in our
site are primarily driven by low rates of gross primary
productivity (GPP), with little shift in ecosystem carbon use
efficiency (CUE) or allocation of net primary productivity (NPP).
Rather than a gradual linear decline in GPP or NPP, there is some
evidence of a sharp transition at the ecotone between submontane
and montane cloud forests, suggesting that cloud immersion, not
temperature, may the primary abiotic driver of the decline in GPP.
Photosynthetic capacity does not strongly decline with elevation
on this transect, providing evidence that neither temperature nor
nutrient limitation restrict maximum rates of photosynthesis at
high elevations. The results suggest that the decline in GPP is
driven by reduction in actual (not potential) rates of
photosynthesis due to increased cloud immersion. Biomass residence
times show a slight increase with elevation, but the low biomass
of higher elevation forests predominantly reflects low growth
rates, which in turn reflects cloud-inhibited rates of
photosynthesis. Tropical mountains are projected to experience
unprecedented rates of warming that may alter patterns of cloud
immersion, raising the possibility for shifts in growth, biomass
and ecosystem functioning as a whole.",
conference-location = "Honolulu, Hawaii",
conference-year = "12-16 July",
language = "en",
urlaccessdate = "20 abr. 2024"
}