scholarly journals New insights into mechanisms driving carbon allocation in tropical forests

2014 ◽  
Vol 205 (1) ◽  
pp. 137-146 ◽  
Author(s):  
Florian Hofhansl ◽  
Jörg Schnecker ◽  
Gabriel Singer ◽  
Wolfgang Wanek
Keyword(s):  
Tropical Forests ◽  
Carbon Allocation

Variations of carbon allocation and turnover time across tropical forests

2021 ◽  
Author(s):  
Hui Yang ◽  
Philippe Ciais ◽  
Yilong Wang ◽  
Yuanyuan Huang ◽  
Jean‐Pierre Wigneron ◽  
...  
Keyword(s):  
Tropical Forests ◽  
Carbon Allocation ◽  
Turnover Time

scholarly journals Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

2013 ◽  
Vol 10 (5) ◽  
pp. 8247-8281 ◽  
Author(s):  
F. Wagner ◽  
V. Rossi ◽  
C. Stahl ◽  
D. Bonal ◽  
B. Hérault
Keyword(s):  
Carbon Cycle ◽  
Tropical Forests ◽  
Time Scale ◽  
Carbon Allocation ◽  
Net Primary Production ◽  
Time Lag ◽  
Production Model ◽  
Wood Production ◽  
Modis Evi ◽  
Seasonal Time Scale

Abstract. The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS EVI dataset, a climate-explicit wood production model and direct litterfall observations at an intra-annual time scale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 Mg C ha−1yr−1 and 2.2 ± 0.4 Mg C ha−1yr−1), they occured separately in time. EVI increased with the magnitude of leaf renewal at the beginning of the dry season when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short lived pools (leaves) to long lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the irradiance-driven leaf renewal and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal time scale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests.

scholarly journals Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

2013 ◽  
Vol 10 (11) ◽  
pp. 7307-7321 ◽  
Author(s):  
F. Wagner ◽  
V. Rossi ◽  
C. Stahl ◽  
D. Bonal ◽  
B. Hérault
Keyword(s):  
Carbon Cycle ◽  
Tropical Forests ◽  
Vegetation Index ◽  
Carbon Allocation ◽  
Net Primary Production ◽  
Time Lag ◽  
Production Model ◽  
Climate Data ◽  
Wood Production ◽  
Global Carbon

Abstract. The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha−1 yr−1), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests.

scholarly journals Climate implications on forest above- and belowground carbon allocation patterns along a tropical elevation gradient on Mt. Kilimanjaro (Tanzania)

Oecologia ◽  
2021 ◽  
Vol 195 (3) ◽  
pp. 797-812
Author(s):  
Natalia Sierra Cornejo ◽  
Christoph Leuschner ◽  
Joscha N. Becker ◽  
Andreas Hemp ◽  
David Schellenberger Costa ◽  
...  
Keyword(s):  
Tropical Forests ◽  
Net Primary Productivity ◽  
Fine Root ◽  
Carbon Allocation ◽  
Elevation Gradient ◽  
Coarse Root ◽  
Belowground Carbon Allocation ◽  
Productivity Data ◽  
Allocation Patterns ◽  
Belowground Productivity

AbstractTropical forests represent the largest store of terrestrial biomass carbon (C) on earth and contribute over-proportionally to global terrestrial net primary productivity (NPP). How climate change is affecting NPP and C allocation to tree components in forests is not well understood. This is true for tropical forests, but particularly for African tropical forests. Studying forest ecosystems along elevation and related temperature and moisture gradients is one possible approach to address this question. However, the inclusion of belowground productivity data in such studies is scarce. On Mt. Kilimanjaro (Tanzania), we studied aboveground (wood increment, litter fall) and belowground (fine and coarse root) NPP along three elevation transects (c. 1800–3900 m a.s.l.) across four tropical montane forest types to derive C allocation to the major tree components. Total NPP declined continuously with elevation from 8.5 to 2.8 Mg C ha−1 year−1 due to significant decline in aboveground NPP, while fine root productivity (sequential coring approach) remained unvaried with around 2 Mg C ha−1 year−1, indicating a marked shift in C allocation to belowground components with elevation. The C and N fluxes to the soil via root litter were far more important than leaf litter inputs in the subalpine Erica forest. Thus, the shift of C allocation to belowground organs with elevation at Mt. Kilimanjaro and other tropical forests suggests increasing nitrogen limitation of aboveground tree growth at higher elevations. Our results show that studying fine root productivity is crucial to understand climate effects on the carbon cycle in tropical forests.

scholarly journals Effects of Soil Fertilization on the Allocation of Net Primary Productivity in Tropical Rainforests of Chocó, Colombia

2021 ◽  
Author(s):  
Harley Quinto-Mosquera ◽  
Hamleth Valois-Cuesta ◽  
Flavio Moreno-Hurtado
Keyword(s):  
Tropical Forests ◽  
Primary Productivity ◽  
Net Primary Productivity ◽  
Carbon Allocation ◽  
Permanent Plots ◽  
Tropical Rainforests ◽  
Soil Fertilization ◽  
Nutrient Contents ◽  
The World ◽  
And Control

Tropical rainforests have the highest rates of net primary productivity (NPP) of the world. Hypotheses about the effect of edaphic nutrient contents, especially the availability of P, propose that they limit NPP of tropical forests or promote the redistribution of its above and belowground components. However, these hypotheses have not been tested experimentally in highly rainy tropical forests. To test such hypotheses, the effects of soil fertilization on the above and belowground NPP were evaluated in forests of two localities of Chocó (Colombia), one of the rainiest regions of the world. Five fertilization treatments (N, P, K, NPK and Control) were applied, and the above and belowground NPP were determined in permanent plots. There were no significant effects of treatments on total NPP; only the application of N significantly increased litter NPP. Additionally, a redistribution of the above and belowground NPP was found with the application of P, which increased the proportion of fine roots and litter, and decreased the woody components of forest NPP. This change of carbon allocation is interpreted as an ecophysiological mechanism to capture additional nutrients in soils with very low content of available P.

Tropical Forests

1921 ◽  
Vol 3 (3supp) ◽  
pp. 267-270
Author(s):  
Vernon Kellogg ◽  
R. M. Yerkes ◽  
H. E. Howe
Keyword(s):  
Tropical Forests

Valuing Tropical Forests

1995 ◽  
Author(s):  
Randall A. Kramer ◽  
narendra Sharma ◽  
Mohan Munasinghe
Keyword(s):  
Tropical Forests

FRUGIVORIA E DISPERSÃO DE SEMENTES POR PEIXES

2008 ◽  
Vol 1 (1) ◽  
pp. 7-18
Author(s):  
Luciane Lopes de Souza
Keyword(s):  
Sustainable Development ◽  
Seed Dispersal ◽  
Tropical Forests ◽  
Natural Regeneration ◽  
Main Species ◽  
Fishing Gears ◽  
Solimões River

Biotic or abiotic processes of seed dispersal are important for the maintenance of the diversity, and for the natural regeneration in tropical forests. Ichthyochory is one of the fundamental mechanisms for seed dispersal in flooded environments, as the “igapó” forests. A study on the ichthyochory of the igapós was conducted at Amanã Sustainable Development Reserve, in the middle Solimões river, from June 2002 to September 2004. Monthly samples of frugivorous fish were taken, with the main fishing gears used locally. Guts of 1,688 fish caught were examined. The main species were Myloplus rubripinnis (29.21%), Hemiodus immaculatus (18.96%),Colossoma macropom um (16.23%) and Mylossoma duriventre (16.05%). The diet was made of vegetables (fruits, leave and flowers), and animals (arthropods). 53.02% of all fish caught ingested fruits. The total number of intact seeds in the stomachs and intestines were 8,069 and 5,763 respectively. About 61.9% of the Brycon melanopterus (matrinchão), 46.34% of the Brycon amazonicus (mamuri) and 30.22% of M . rubripinnis (parum ) analysed had intact seeds in their guts. Seeds of Nectandra amazonum and Genipa spruceana ingested proved to be more viable than those non-ingested by fish. The high rates of frugivory, the presence of intact seeds in the guts of fish and the greater viability of ingested seeds all suggest that these animals are important seed dispersors in the “igapó” forests of Amanã Reserve.

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