Topography strongly affects atmospheric deposition and canopy exchange processes in different types of wet lowland rainforest, Southwest Costa Rica

2010 ◽  
Vol 106 (3) ◽  
pp. 371-396 ◽  
Author(s):  
F. Hofhansl ◽  
W. Wanek ◽  
S. Drage ◽  
W. Huber ◽  
A. Weissenhofer ◽  
...  
Keyword(s):  
Costa Rica ◽  
Atmospheric Deposition ◽  
Canopy Exchange ◽  
Exchange Processes ◽  
Different Types ◽  
Lowland Rainforest

Atmospheric deposition and canopy exchange processes in heathland ecosystems

1992 ◽  
Vol 75 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Roland Bobbink ◽  
Gerrit W. Heil ◽  
Marc B.A.G. Raessen
Keyword(s):  
Atmospheric Deposition ◽  
Canopy Exchange ◽  
Exchange Processes

Statistical Description of Isotope Exchange Processes: A Multisite Model for the 18O Exchange

1982 ◽  
Vol 37 (11-12) ◽  
pp. 1161-1169 ◽  
Author(s):  
Paul Rösch
Keyword(s):  
Active Site ◽  
Isotope Exchange ◽  
Analytical Procedure ◽  
Matrix Formalism ◽  
Model Calculations ◽  
Exchange Processes ◽  
Reaction Solution ◽  
Different Types ◽  
Refinement Procedure

Abstract An analytical procedure has been developed for the determination of isotope exchange processes as exemplified by the 18O exchange catalysed by enzyme-nucleotide complexes. The model is able to handle more than one type of active site per reaction solution and is also able to distinguish between different types of inequivalence of the oxygens of enzyme bound Pi. Use of transition matrix formalism and basic statistical considerations lead directly to the simple model. A data refinement procedure is introduced and model calculations are shown.

The Structure of Different Types of Liver Cells in Relation to Uptake and Exchange Processes

1988 ◽  
pp. 1-14
Author(s):  
Albert Geerts ◽  
Luc Bouwens ◽  
Ronald De Zanger ◽  
Hans Van Bossuyt ◽  
Eddie Wisse
Keyword(s):  
Liver Cells ◽  
Exchange Processes ◽  
Different Types

Atmospheric deposition and net retention of ions by the canopy in a tropical montane forest, Monteverde, Costa Rica

1998 ◽  
Vol 14 (1) ◽  
pp. 27-45 ◽  
Author(s):  
KENNETH L. CLARK ◽  
NALINI M. NADKARNI ◽  
DOUGLAS SCHAEFER ◽  
HENRY L. GHOLZ
Keyword(s):  
Costa Rica ◽  
Atmospheric Deposition ◽  
Inorganic Ions ◽  
Montane Forest ◽  
Cloud Water ◽  
Tropical Montane Forest ◽  
Weighted Mean ◽  
Ammonium N ◽  
Mist Deposition ◽  
Balance Technique

Meteorological variables, bulk cloud water and precipitation (BCWP), and bulk precipitation (BP) were measured above the canopy, and throughfall (TF; n = 20) was collected beneath an epiphyte-laden canopy of a tropical montane forest (TMF) for 1 y at Monteverde, Costa Rica. Total deposition (cloud + wet + dry) of inorganic ions to the canopy was estimated using a sodium (Na+) mass balance technique. Annual BCWP and BP depths were 2678 mm and 1792 for events where mean windspeeds (u) ≥ 2 m s&supminus1;, and 4077 mm and 3191 mm for all events, respectively. Volume-weighted mean pH and concentrations of nitrate-N (NO3−-N) and ammonium-N (NH4+-N) were 4.88, 0.09 and 0.09 mg l&supminus1; in BCWP, and 5.00, 0.05 and 0.05 mg l&supminus1; in BP, respectively. Cloud water and mist deposition to the canopy was estimated to be 356 mm. Estimated deposition of free acidity (H+), NO3−-N, and NH4+-N to the canopy was 0.49, 3.4 and 3.4 kg ha&supminus1; y&supminus1;, respectively. Mean TF depth was 1054 ± 83 mm (mean ± S.E.) for events where u ≥ 2 m s&supminus1;, and 2068 ± 132 mm for all events. Volume-weighted mean pH and concentrations of NO3−-N and NH4+-N in TF were 5.72, 0.04 mg l&supminus1;, and 0.07 mg l&supminus1;, respectively. Mean fluxes of H+, NO3−-N, and NH4+-N in TF were 0.04 ± 0.01, 0.6 ± 0.2 and 1.3 ± 0.2 kg ha&supminus1; y&supminus1;, and percent net retention of these ions by the canopy was 92 ± 2, 80 ±6, and 61 ± 6%, respectively. Phosphate, potassium, calcium and magnesium were leached from the canopy. Seasonal data suggest that biomass burning increased concentrations of NO3− and NH4+ in cloud water and precipitation at the end of the dry season. Regardless, a large majority of the inorganic N in atmospheric deposition was retained by the canopy at this site.

scholarly journals Nitrogen fixation by phyllosphere bacteria associated with higher plants and their colonizing epiphytes of a tropical lowland rainforest of Costa Rica

2008 ◽  
Vol 2 (5) ◽  
pp. 561-570 ◽  
Author(s):  
Michael Fürnkranz ◽  
Wolfgang Wanek ◽  
Andreas Richter ◽  
Guy Abell ◽  
Frank Rasche ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Costa Rica ◽  
Higher Plants ◽  
Tropical Lowland ◽  
Lowland Rainforest ◽  
Phyllosphere Bacteria ◽  
Tropical Lowland Rainforest

scholarly journals The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica

2015 ◽  
Vol 120 (12) ◽  
pp. 2579-2595 ◽  
Author(s):  
Diana Oviedo‐Vargas ◽  
David P. Genereux ◽  
Diego Dierick ◽  
Steven F. Oberbauer
Keyword(s):  
Carbon Dioxide ◽  
Costa Rica ◽  
Methane Emissions ◽  
Lowland Rainforest ◽  
Regional Groundwater

Comparison of Bulk, Wet-Only, and Wet-plus-Dry Deposition Measurements at the Turkey Lakes Watershed

1988 ◽  
Vol 45 (S1) ◽  
pp. s26-s37 ◽  
Author(s):  
Robert J. Vet ◽  
Alain Sirois ◽  
Dean S. Jeffries ◽  
R. G. Semkin ◽  
N. W. Foster ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
Dry Deposition ◽  
Measurement Methods ◽  
Bulk Deposition ◽  
Data Sets ◽  
Bulk Data ◽  
Different Types ◽  
Turkey Lakes Watershed ◽  
Seasonal Deposition ◽  
Nitrate Deposition

Four different types of atmospheric deposition measurements were made at the Turkey Lakes Watershed from 1981 to 1984. They included weekly and variable period bulk deposition measurements. The resulting annual and seasonal deposition estimates from the four methods were compared for numerical and statistical differences. Several results unexpected from the theory of the measurement methods appeared in the comparison: (1) one of the bulk deposition measurements produced lower deposition of acid-related ions than the two wet-only measurements and (2) the monthly wet-only measurements produced higher deposition of sulphate than the two bulk deposition data sets (by 6 and 19%). Several results were consistent with the theory of the measurements: (1) the daily wet-only measurements produced deposition values lower than the weekly bulk deposition measurements and (2) the wet-plus-dry deposition measurements produced higher estimates of sulphate and nitrate deposition than the two bulk data sets (15 – 35% higher). Laboratory biases appeared to be partially responsible for some of the differences found in the comparison.

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