Climate, Topography, and Canopy Chemistry Exert Hierarchical Control Over Soil N Cycling in a Neotropical Lowland Forest

Brooke B. Osborne, Megan K. Nasto, Gregory P. Asner, Christopher S. Balzotti, Cory C. Cleveland, Benjamin W. Sullivan, Philip G. Taylor, Alan R. Townsend, Stephen Porder

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Nutrient availability varies substantially across lowland tropical forests and constrains their responses to global change. However, interactions among regional, landscape, and local controls of nutrient availability are poorly understood. In that context, we explored the effects of rainfall, topography, and canopy chemistry on nitrogen (N) cycling across the Osa Peninsula (Costa Rica). We sampled soils from catenas in regions receiving 3000 versus 5000 mm y−1 rainfall. In both regions, we sampled catenas starting on narrow, knife-edged ridges, and in the less humid region we compared catenas starting on rapidly eroding knife-edged ridges to catenas with ridges consisting of slowly eroding terraces. On the stable terraces, we sampled soils from 0.25 ha plots with either high or low mean canopy N. In all sites, we measured metrics of long- (soil δ15N) and short-term (net nitrification, net N mineralization, and KCl-extractable N) N availability. Mean soil δ15N was elevated in the less humid region (3.8 ± 0.16 vs. 3.1 ± 0.14‰; P = 0.003). Within that region, mean δ15N was enriched by approximately 1‰ on stable terraces (5.3 ± 0.14‰) relative to nearby knife-edged ridges (4.0 ± 0.24‰; P < 0.001). Short-term N metrics did not vary with rainfall or topography (P > 0.05). By contrast, short-term soil N metrics differed under canopies with high versus low canopy N, but soil δ15N did not. These results illustrate the role of climate and topography as dominant drivers of long-term N cycling in the region, as well as the potential for canopy characteristics, which are likely determined by species composition in this system, to impose small-scale heterogeneity within those broader constraints. Overall, our work suggests the utility of a hierarchical framework for understanding how diverse drivers of nutrient status interact across space and time in tropical forests.

Original languageEnglish (US)
Pages (from-to)1089-1103
Number of pages15
JournalEcosystems
Volume20
Issue number6
DOIs
StatePublished - Sep 1 2017
Externally publishedYes

Fingerprint

lowland forests
Topography
tropical forests
topography
catenas
catena
chemistry
canopy
climate
Soils
knives
terraces
Nutrients
terrace
soil
Availability
nutrient availability
tropical forest
Rain
rain

Keywords

  • N
  • canopy chemistry
  • Carnegie Airborne Observatory
  • climate
  • imaging spectroscopy
  • LiDAR
  • nitrogen
  • soil
  • topography

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Environmental Chemistry
  • Ecology

Cite this

Osborne, B. B., Nasto, M. K., Asner, G. P., Balzotti, C. S., Cleveland, C. C., Sullivan, B. W., ... Porder, S. (2017). Climate, Topography, and Canopy Chemistry Exert Hierarchical Control Over Soil N Cycling in a Neotropical Lowland Forest. Ecosystems, 20(6), 1089-1103. https://doi.org/10.1007/s10021-016-0095-7

Climate, Topography, and Canopy Chemistry Exert Hierarchical Control Over Soil N Cycling in a Neotropical Lowland Forest. / Osborne, Brooke B.; Nasto, Megan K.; Asner, Gregory P.; Balzotti, Christopher S.; Cleveland, Cory C.; Sullivan, Benjamin W.; Taylor, Philip G.; Townsend, Alan R.; Porder, Stephen.

In: Ecosystems, Vol. 20, No. 6, 01.09.2017, p. 1089-1103.

Research output: Contribution to journalArticle

Osborne, BB, Nasto, MK, Asner, GP, Balzotti, CS, Cleveland, CC, Sullivan, BW, Taylor, PG, Townsend, AR & Porder, S 2017, 'Climate, Topography, and Canopy Chemistry Exert Hierarchical Control Over Soil N Cycling in a Neotropical Lowland Forest', Ecosystems, vol. 20, no. 6, pp. 1089-1103. https://doi.org/10.1007/s10021-016-0095-7
Osborne, Brooke B. ; Nasto, Megan K. ; Asner, Gregory P. ; Balzotti, Christopher S. ; Cleveland, Cory C. ; Sullivan, Benjamin W. ; Taylor, Philip G. ; Townsend, Alan R. ; Porder, Stephen. / Climate, Topography, and Canopy Chemistry Exert Hierarchical Control Over Soil N Cycling in a Neotropical Lowland Forest. In: Ecosystems. 2017 ; Vol. 20, No. 6. pp. 1089-1103.
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