Forest Structure and Productivity in Puerto Rico's Luquillo Mountains

Weaver, Peter L.; Murphy, Peter G.

doi:10.2307/2388721

Cited by 197 publications

(194 citation statements)

References 21 publications

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“…Esse resultado é próximo ao valor de 7,6 t ha -1 ano -1 , encontrado por Weaver & Murphy (1990) em uma floresta tropical de Porto Rico. Comparando-se com algumas estimativas feitas em florestas tropicais obtidas por Whittaker & Likens (1975) de 9,0 t ha -1 ano -1 , ou por Atjay et al (1979), de 10,0 t ha -1 ano -1 , o valor simulado por esse modelo foi cerca de 30% menor.…”

Section: Resultsunclassified

Simulação dos efeitos das mudanças do uso da terra na dinâmica de carbono no solo na bacia do rio Piracicaba

Silveira

Victória

Ballester

et al. 2000

Pesq. agropec. bras.

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, LUIZ ANTONIO MARTINELLI 5 e MARISA DE CÁSSIA PICCOLO 6 RESUMO -Neste trabalho teve-se como objetivo testar o modelo CENTURY para simular os efeitos das mudanças de uso da terra nos teores de carbono no solo e na produção primária líquida na bacia do rio Piracicaba, SP. O modelo foi parametrizado e as simulações foram realizadas considerando-se áreas de florestas, pastagens e cana-de-açúcar, dada a sua importância econômica. Os resultados obtidos indicaram que a alteração do uso/cobertura do solo provoca a diminuição do estoque de carbono do solo. As simulações realizadas na transição de uma floresta para cana-de-açúcar indicaram um decréscimo de 28% no estoque de carbono nos primeiros 12 anos, e diminuição de 42% com 50 anos de cultivo do solo com essa gramínea. Na simulação da transição de uma floresta para pasto, seguida do cultivo da cana-deaçúcar, verificou-se que na primeira mudança (floresta-pastagem) a perda de carbono foi de 24%, enquanto na segunda alteração (pastagem-cana) a perda foi de 22%. Com relação à produção primária, os resultados obtidos de floresta (6,6 t ha), cana-de-açúcar (77, 82, 80 t ha) e pasto (6,5 t ha), mostraram-se similares aos valores observados no campo por outros autores.Termos para indexação: biogeoquímica, modelagem, subtropical. SIMULATION OF THE EFFECTS OF LAND USE CHANGES IN SOIL CARBON DYNAMICS IN THE PIRACICABA RIVER BASIN, SÃO PAULO STATE, BRAZILABSTRACT -The objective of this study was to test adequability of the CENTURY model to simulate the effects of land use changes on soil carbon content and net primary production to specific subtropical Brazilian environmental conditions. After parameterization, simulations were performed for forested areas, pasture and sugarcane cultures which have economical importance and representative areal extension in the Piracicaba River basin, São Paulo State, Brazil. The results obtained indicate that changes in use/cover from forest to agricultural practices resulted in lower soil carbon stocks. The simulations of the transition from forest to sugarcane indicated a decrease of 28% in soil carbon stocks for the first 12 years and 42% for 50 years of sugarcane cultivation. The simulation of the transition from forest to pasture and then to sugarcane resulted in a 24% loss of soil carbon stock for the first transition (forest-pasture) and of 22% for the second one (pasture-sugar-cane). The net primary production results obtained for forest (6.6 ton ha -1 yr ) and pasture (6.5 ton ha -1 yr -1) were similar to those observed by other authors in field measurements.

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Section: Resultsunclassified

Simulação dos efeitos das mudanças do uso da terra na dinâmica de carbono no solo na bacia do rio Piracicaba

Silveira

Victória

Ballester

et al. 2000

Pesq. agropec. bras.

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“…The mean annual rainfall increases with elevation from approximately 2450 mm per year at lower elevations to over 4000 mm per year at higher elevations. The mean annual temperature declines from 23 to 19°C along the elevation gradient (Weaver and Murphy, 1990;Silver et al, 1999). Within the Luquillo Mountains, there are four forest types along the elevation gradient: lower montane rain forest below 600 m.a.s.l (Tabonuco forest), montane rain forest between 600 and 900 m.a.s.l (Colorado forest), and Elfin/dwarf forest on the exposed slopes or ridges above 900 m.a.s.l, and Palm forest scattered on steep slopes and near riparian areas especially above 500 m.a.s.l (Weaver and Murphy, 1990).…”

Section: Study Sitementioning

confidence: 99%

“…The mean annual temperature declines from 23 to 19°C along the elevation gradient (Weaver and Murphy, 1990;Silver et al, 1999). Within the Luquillo Mountains, there are four forest types along the elevation gradient: lower montane rain forest below 600 m.a.s.l (Tabonuco forest), montane rain forest between 600 and 900 m.a.s.l (Colorado forest), and Elfin/dwarf forest on the exposed slopes or ridges above 900 m.a.s.l, and Palm forest scattered on steep slopes and near riparian areas especially above 500 m.a.s.l (Weaver and Murphy, 1990). Each forest type differs greatly in species composition, richness, structure, productivity, litterfall and environmental factors (Weaver and Murphy, 1990;Silver et al, 1999).…”

Section: Study Sitementioning

confidence: 99%

“…Within the Luquillo Mountains, there are four forest types along the elevation gradient: lower montane rain forest below 600 m.a.s.l (Tabonuco forest), montane rain forest between 600 and 900 m.a.s.l (Colorado forest), and Elfin/dwarf forest on the exposed slopes or ridges above 900 m.a.s.l, and Palm forest scattered on steep slopes and near riparian areas especially above 500 m.a.s.l (Weaver and Murphy, 1990). Each forest type differs greatly in species composition, richness, structure, productivity, litterfall and environmental factors (Weaver and Murphy, 1990;Silver et al, 1999). Mountains in the LEF are characterized by steep, highly dissected topography with slopes varying between 2 and 75°(22°on average) and they contain geomorphologically complex combinations of ridge, slope, upland valley and riparian valley (Garcia-Montiel and Scatena, 1994;Scatena and Lugo, 1995).…”

Section: Study Sitementioning

confidence: 99%

“…Originally, the CENTURY soil model used a soil depth of 20 cm. We allowed the simulated soil depth to 30 cm in our simulation in order to meet the 15 cm depth intervals in water submodel of the CENTURY model, as well as the fact that soil organic matter decreases greatly with depth and a large amount of SOC is stored at surface layer in the LEF (Lugo et al, 1986Odum and Pigeon, 1970;Silver et al, 1994;Weaver and Murphy, 1990).…”

Section: Model Descriptionmentioning

confidence: 99%

See 2 more Smart Citations

Spatial and seasonal dynamics of surface soil carbon in the Luquillo Experimental Forest, Puerto Rico

Wang

Cornell

Hall

et al. 2002

Ecological Modelling

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Impact of hydrologically driven hillslope erosion and landslide occurrence on soil organic carbon dynamics in tropical watersheds

Dialynas

Bastola

Bras

et al. 2016

Water Resources Research

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The dynamics of soil organic carbon (SOC) in tropical forests play an important role in the global carbon (C) cycle. Past attempts to quantify the net C exchange with the atmosphere in regional and global budgets do not systematically account for dynamic feedbacks among linked hydrological, geomorphological, and biogeochemical processes, which control the fate of SOC. Here we quantify effects of geomorphic perturbations on SOC oxidation and accumulation in two adjacent wet tropical forest watersheds underlain by contrasting lithology (volcaniclastic rock and quartz diorite) in the Luquillo Critical Zone Observatory. This study uses the spatially explicit and physically based model of SOC dynamics tRIBS‐ECO (Triangulated Irregular Network‐based Real‐time Integrated Basin Simulator‐Erosion and Carbon Oxidation) and measurements of SOC profiles and oxidation rates. Our results suggest that hillslope erosion at the two watersheds may drive C sequestration or CO2 release to the atmosphere, depending on the forest type and land use. The net erosion‐induced C exchange with the atmosphere was controlled by the spatial distribution of forest types. The two watersheds were characterized by significant erosion and dynamic replacement of upland SOC stocks. Results suggest that the landscape underlain by volcaniclastic rock has reached a state close to geomorphic equilibrium, and the landscape underlain by quartz diorite is characterized by greater rates of denudation. These findings highlight the importance of the spatially explicit and physical representation of C erosion driven by local variation in lithological and geomorphological characteristics and in forest cover.

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Forest Structure and Productivity in Puerto Rico's Luquillo Mountains

Cited by 197 publications

References 21 publications

Simulação dos efeitos das mudanças do uso da terra na dinâmica de carbono no solo na bacia do rio Piracicaba

Simulação dos efeitos das mudanças do uso da terra na dinâmica de carbono no solo na bacia do rio Piracicaba

Spatial and seasonal dynamics of surface soil carbon in the Luquillo Experimental Forest, Puerto Rico

Impact of hydrologically driven hillslope erosion and landslide occurrence on soil organic carbon dynamics in tropical watersheds

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