Andean grasslands are as productive as tropical cloud forests

I Oliveras, C Girardin, C E Doughty, C E Arenas , N Cahuana, V Oliver, W Huaraca Huasco, Y Malhi

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Abstract

We aim to assess net primary productivity (NPP) and carbon cycling in Andean tropical alpine grasslands (puna) and compare it with NPP of tropical montane cloud forests. We ask the following questions: (1) how do NPP and soil respiration of grasslands vary over the seasonal cycle? (2) how do burning and grazing affect puna productivity? (3) if the montane forest expands into the puna, what will be the resulting change in productivity? The study sites are located at the South-eastern Peruvian Andes; one grassland site and the forest sites are in Wayqecha biological station, and another grassland site in Manu National Park. At each grassland site, we selected a burnt and an unburnt area, installed unfenced and fenced transects in each area, and monitored above-ground productivity (NPPAG), below-ground productivity (NPPBG) and soil respiration (Rs) for 2 yr. In the forest, we monitored NPPAG, NPPBG and Rs for 2–4 yr. Grassland NPP varied between 4.6 ± 0.25 (disturbed areas) to 15.3 ± 0.9 Mg C ha−1 yr−1 (undisturbed areas) and cloud forest NPP was between 7.05 ± 0.39 and 8.0 ± 0.47 Mg C ha−1 yr−1, while soil carbon stocks were in the range of 126 ± 22 to 285 ± 31 Mg C ha−1. There were no significant differences on NPP between the puna and forest sites. The most undisturbed site had significantly higher NPP than other grassland sites, but no differences were found when relating grazing and fire at other sites. There were lower residence times of above-ground biomass compared to below-ground biomass. There was a strong seasonal signal on grassland NPPAG and NPPBG, with a shift on allocation at the beginning of the austral summer. High elevation tropical grasslands can be as productive as adjacent cloud forests, but have very different carbon cycling and retention properties than cloud forests.
Original languageEnglish
Article number115011
JournalEnvironmental Research Letters
Volume9
Issue number11
DOIs
Publication statusPublished - 20 Nov 2014

Fingerprint

cloud forest
tropical forest
Productivity
grassland
productivity
Respiration
Soil
Carbon
Biomass
montane forest
soil respiration
Soils
Grassland
Forests
grazing
belowground biomass
carbon
aboveground biomass
soil carbon
residence time

Keywords

  • tropical alpine wetlands
  • above-ground productivity
  • below-ground productivity
  • fire
  • grazing
  • disturbances
  • puna

Cite this

Oliveras, I., Girardin, C., Doughty, C. E., Arenas , C. E., Cahuana, N., Oliver, V., ... Malhi, Y. (2014). Andean grasslands are as productive as tropical cloud forests. Environmental Research Letters, 9(11), [115011]. https://doi.org/10.1088/1748-9326/9/11/115011

Andean grasslands are as productive as tropical cloud forests. / Oliveras, I; Girardin, C; Doughty, C E; Arenas , C E ; Cahuana, N; Oliver, V; Huaraca Huasco, W; Malhi, Y.

In: Environmental Research Letters, Vol. 9, No. 11, 115011, 20.11.2014.

Research output: Contribution to journalArticle

Oliveras, I, Girardin, C, Doughty, CE, Arenas , CE, Cahuana, N, Oliver, V, Huaraca Huasco, W & Malhi, Y 2014, 'Andean grasslands are as productive as tropical cloud forests', Environmental Research Letters, vol. 9, no. 11, 115011. https://doi.org/10.1088/1748-9326/9/11/115011
Oliveras I, Girardin C, Doughty CE, Arenas CE, Cahuana N, Oliver V et al. Andean grasslands are as productive as tropical cloud forests. Environmental Research Letters. 2014 Nov 20;9(11). 115011. https://doi.org/10.1088/1748-9326/9/11/115011
Oliveras, I ; Girardin, C ; Doughty, C E ; Arenas , C E ; Cahuana, N ; Oliver, V ; Huaraca Huasco, W ; Malhi, Y. / Andean grasslands are as productive as tropical cloud forests. In: Environmental Research Letters. 2014 ; Vol. 9, No. 11.
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N1 - Acknowledgments This paper is a product of the ABERG research consortium. The authors wish to thank to the research assistants for field assistance, and to MNP forest rangers for allowing us to use their facilities. We also thank the Amazon Basin Conservation Association for institutional support. This material is based upon work supported by the UK Natural Environnent Research Council under grant NE/G006385/1.

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N2 - We aim to assess net primary productivity (NPP) and carbon cycling in Andean tropical alpine grasslands (puna) and compare it with NPP of tropical montane cloud forests. We ask the following questions: (1) how do NPP and soil respiration of grasslands vary over the seasonal cycle? (2) how do burning and grazing affect puna productivity? (3) if the montane forest expands into the puna, what will be the resulting change in productivity? The study sites are located at the South-eastern Peruvian Andes; one grassland site and the forest sites are in Wayqecha biological station, and another grassland site in Manu National Park. At each grassland site, we selected a burnt and an unburnt area, installed unfenced and fenced transects in each area, and monitored above-ground productivity (NPPAG), below-ground productivity (NPPBG) and soil respiration (Rs) for 2 yr. In the forest, we monitored NPPAG, NPPBG and Rs for 2–4 yr. Grassland NPP varied between 4.6 ± 0.25 (disturbed areas) to 15.3 ± 0.9 Mg C ha−1 yr−1 (undisturbed areas) and cloud forest NPP was between 7.05 ± 0.39 and 8.0 ± 0.47 Mg C ha−1 yr−1, while soil carbon stocks were in the range of 126 ± 22 to 285 ± 31 Mg C ha−1. There were no significant differences on NPP between the puna and forest sites. The most undisturbed site had significantly higher NPP than other grassland sites, but no differences were found when relating grazing and fire at other sites. There were lower residence times of above-ground biomass compared to below-ground biomass. There was a strong seasonal signal on grassland NPPAG and NPPBG, with a shift on allocation at the beginning of the austral summer. High elevation tropical grasslands can be as productive as adjacent cloud forests, but have very different carbon cycling and retention properties than cloud forests.

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