BIOSPHERE-ATMOSPHERE INTERACTIONS IN DRY FOREST (MT) Site description Net ecosystem CO 2 exchange measurements Meteorological and ancillary measurements.

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Presentation transcript:

BIOSPHERE-ATMOSPHERE INTERACTIONS IN DRY FOREST (MT) Site description Net ecosystem CO 2 exchange measurements Meteorological and ancillary measurements Field problems Preliminary results Additional measurements

The study was conducted approximately 50 km NE of Sinop Mato Grosso, Brazil (11°24.75'S: 55°19.50'W), which is located in the tropical rain forest and savanna ecotone Measurements were conducted between August 1999 and July 2001 in an intact, mature transitional forest with a closed m tall canopy. The vegetation consists of evergreen trees that are characteristic of transitional forest in Mato Grosso. Soils are sandy, well-drained nutrient-poor (dystrophic) ultisols.

Sonic anemometer calibration - Team training

Leaf photosynthesis curve measurement

Leaf water potential measurement

Monitoring litter fall and decomposition: contribution to the transitional tropical forest (cerradão) respiration Litter fall 20 litter traps were installed in a 1 ha plot close to the meteorological tower. Fallen litter was collected monthly sorted and dry mass of leaves, twigs, flowers and fruits. Litter pool Monthly, in the same plot, litter on the soil surface was collected in 20, 25cmx25cm sampling squares. Litter decomposition dynamics In the same plot, we collected the litter on the forest soil to make the decomposition estimation.

Field problems

Lightining problems

UFMT technician fixing datalogger

Monitoring lighgtining activity around the Sinop tower

Preliminary results

PAR mount installed on the tree

Preliminary results Over the annual cycle, the CO2 flux of the transitional forest appears to be in balance. Our composite annual estimate of net C accumulation was 0.04 tC/ha. This value is lower than estimates reported for other forest ecosystems. There are large seasonal variations in transitional forest CO2 flux due to rainfall.