The age of the DBH How much time tropical trees need to attain 1.3 m height Simone Vieira (CENA) Susan Trumbore (UCI) Plínio Camargo (CENA) Luiz Martinelli.

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Presentation transcript:

The age of the DBH How much time tropical trees need to attain 1.3 m height Simone Vieira (CENA) Susan Trumbore (UCI) Plínio Camargo (CENA) Luiz Martinelli (CENA) Diogo Selhorst (SETEM) Niro Higuchi (INPA)

Asner et al. 2005

Ecosystem Function Time Elasticity Disturbance Inertia System stability Function range

Forest Structure and dynamics Age structure

Background

Precipitation 2200 mm 1900 mm 1960 mm

Differences between forests

Forest structure

Manaus has more biomass overall, in smaller trees, than sites with a more pronounced dry season Vieira et al., 2004

Not all forests in the Amazon are alike SiteStem/haMgC/ha Manaus Santarém Rio Branco Humaitá

Age structure simulated - Manaus 0.04cm/year 0.65* stdev 0.02cm/year stdev 0.02cm/year 0.65* stdev Trees >300 years old 50% Trees >300 years old 50% Trees >300 years old 45% Vieira et al. 2005

Age structure simulated - Rio Branco 0.04cm/year 0.65* stdev 0.02cm/year stdev 0.02cm/year 0.65* stdev Trees >300 years old 32% Trees >300 years old 38% Trees >300 years old 27% Vieira et al. 2005

Age structure simulated - Santarém 0.04cm/year 0.65* stdev 0.02cm/year stdev 0.02cm/year 0.65* stdev Trees >300 years old 18% Trees >300 years old 27% Trees >300 years old 17% Vieira et al. 2005

Manaus Santarém Rio Branco Individuals/ha Biomass C MgC/ha Growth MgC/ha/yr Mean age of C (yr)* MRT of C (stock/growth)** Mean Tree Age (yr)* * From monte carlo simulations **biomass-weighted Data from Vieira et al C dynamics differ with forest location

Radiocarbon and dendrometer based estimates of growth agree Big trees grow more rapidly than small trees Trees in Manaus (central Amazon) grow much more slowly than other areas

Field sites Terra firme forest Oxisols (Distrophic and Eutrophic) Variation in dry season length Shortest in Manaus, longer in Rio Branco (Catuaba and Humaitá), Santarém Water Table – Deep (Manaus, Santarém) – Shallow (Acre)

Sampling

2 plots by site (2.5 X 2.5 m) Recent gap and not recent gap All trees smaller than 10 cm DBH Tress with 1.3m heigth Radiocarbon dating – Base and DBH (center)

1.3m

~ stem/ha

Although biomass may recover quickly through fast-growing pioneer species, slow growing species (therefore biodiversity) will take centuries to recover from disturbance Implications of low growth rates: