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Nutrient limitation in rainforests and cloud forests along a 3,000-m elevation gradient in the Peruvian Andes

Fisher, Joshua B.; Malhi, Yadvinder; Cuba Torres, Israel; Metcalfe, Dan LU ; van de Weg, Martine J.; Meir, Patrick; Silva-Espejo, Javier E. and Huaraca Huasco, Walter (2013) In Oecologia 172(3). p.889-902
Abstract
We report results from a large-scale nutrient fertilization experiment along a "megadiverse" (154 unique species were included in the study) 3,000-m elevation transect in the Peruvian Andes and adjacent lowland Amazonia. Our objectives were to test if nitrogen (N) and phosphorus (P) limitation shift along this elevation gradient, and to determine how an alleviation of nutrient limitation would manifest in ecosystem changes. Tree height decreased with increasing elevation, but leaf area index (LAI) and diameter at breast height (DBH) did not vary with elevation. Leaf N:P decreased with increasing elevation (from 24 at 200 m to 11 at 3,000 m), suggesting increased N limitation and decreased P limitation with increasing elevation. After 4... (More)
We report results from a large-scale nutrient fertilization experiment along a "megadiverse" (154 unique species were included in the study) 3,000-m elevation transect in the Peruvian Andes and adjacent lowland Amazonia. Our objectives were to test if nitrogen (N) and phosphorus (P) limitation shift along this elevation gradient, and to determine how an alleviation of nutrient limitation would manifest in ecosystem changes. Tree height decreased with increasing elevation, but leaf area index (LAI) and diameter at breast height (DBH) did not vary with elevation. Leaf N:P decreased with increasing elevation (from 24 at 200 m to 11 at 3,000 m), suggesting increased N limitation and decreased P limitation with increasing elevation. After 4 years of fertilization (N, P, N + P), plots at the lowland site (200 m) fertilized with N + P showed greater relative growth rates in DBH than did the control plots; no significant differences were evident at the 1,000 m site, and plots fertilized with N at the highest elevation sites (1,500, 3,000 m) showed greater relative growth rates in DBH than did the control plots, again suggesting increased N constraint with elevation. Across elevations in general N fertilization led to an increase in microbial respiration, while P and N + P addition led to an increase in root respiration and corresponding decrease in hyphal respiration. There was no significant canopy response (LAI, leaf nutrients) to fertilization, suggesting that photosynthetic capacity was not N or P limited in these ecosystems. In sum, our study significantly advances ecological understanding of nutrient cycling and ecosystem response in a region where our collective knowledge and data are sparse: we demonstrate N limitation in high elevation tropical montane forests, N and P co-limitation in lowland Amazonia, and a nutrient limitation response manifested not in canopy changes, but rather in stem and belowground changes. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fertilization, Forest, Montane, Nitrogen, Phosphorus, Tropical
in
Oecologia
volume
172
issue
3
pages
889 - 902
publisher
Springer
external identifiers
  • wos:000320409100024
  • scopus:84878985729
ISSN
1432-1939
DOI
10.1007/s00442-012-2522-6
language
English
LU publication?
no
id
25c8620c-7e54-4522-9f60-6dd118292e61 (old id 4643859)
date added to LUP
2014-09-26 07:55:52
date last changed
2019-09-29 03:36:18
@article{25c8620c-7e54-4522-9f60-6dd118292e61,
  abstract     = {We report results from a large-scale nutrient fertilization experiment along a "megadiverse" (154 unique species were included in the study) 3,000-m elevation transect in the Peruvian Andes and adjacent lowland Amazonia. Our objectives were to test if nitrogen (N) and phosphorus (P) limitation shift along this elevation gradient, and to determine how an alleviation of nutrient limitation would manifest in ecosystem changes. Tree height decreased with increasing elevation, but leaf area index (LAI) and diameter at breast height (DBH) did not vary with elevation. Leaf N:P decreased with increasing elevation (from 24 at 200 m to 11 at 3,000 m), suggesting increased N limitation and decreased P limitation with increasing elevation. After 4 years of fertilization (N, P, N + P), plots at the lowland site (200 m) fertilized with N + P showed greater relative growth rates in DBH than did the control plots; no significant differences were evident at the 1,000 m site, and plots fertilized with N at the highest elevation sites (1,500, 3,000 m) showed greater relative growth rates in DBH than did the control plots, again suggesting increased N constraint with elevation. Across elevations in general N fertilization led to an increase in microbial respiration, while P and N + P addition led to an increase in root respiration and corresponding decrease in hyphal respiration. There was no significant canopy response (LAI, leaf nutrients) to fertilization, suggesting that photosynthetic capacity was not N or P limited in these ecosystems. In sum, our study significantly advances ecological understanding of nutrient cycling and ecosystem response in a region where our collective knowledge and data are sparse: we demonstrate N limitation in high elevation tropical montane forests, N and P co-limitation in lowland Amazonia, and a nutrient limitation response manifested not in canopy changes, but rather in stem and belowground changes.},
  author       = {Fisher, Joshua B. and Malhi, Yadvinder and Cuba Torres, Israel and Metcalfe, Dan and van de Weg, Martine J. and Meir, Patrick and Silva-Espejo, Javier E. and Huaraca Huasco, Walter},
  issn         = {1432-1939},
  keyword      = {Fertilization,Forest,Montane,Nitrogen,Phosphorus,Tropical},
  language     = {eng},
  number       = {3},
  pages        = {889--902},
  publisher    = {Springer},
  series       = {Oecologia},
  title        = {Nutrient limitation in rainforests and cloud forests along a 3,000-m elevation gradient in the Peruvian Andes},
  url          = {http://dx.doi.org/10.1007/s00442-012-2522-6},
  volume       = {172},
  year         = {2013},
}