Tropical forest

7 important questions on Tropical forest

What two gradients are determining the above-ground biomass distribution in the Amazon?

1. Precipitation gradient. NW having a wet climate and SE a dry climate.
2.  Soil depth and nutrient uptake gradient. SW is young shallow & high in phosphorus and the NE having deep old soils which are low in phosphorus.

What two gradients are determining the above-ground biomass distribution in the Amazon?

1. Precipitation gradient. NW having a wet climate and SE a dry climate.
2.  Soil depth and nutrient uptake gradient. SW is young shallow & high in phosphorus and the NE having deep old soils which are low in phosphorus.

Name three treads in the Amazon forest.

1. Land use change
2. Fire
3. Drought
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What are the main changes in feedback of land use change in the conversion from forest to grassland.

In grassland less evaporation therefore less latent heat and more sensible heat.

What do the younger, nutrient rich but shallow and limited rooting depth soil in the Western part of the Amazon result in?

Fast forest growth but high tree mortality and fast biomass turnover.

What do the older, less fertile but deeper soils in the east result in?


A relatively slow tree growth and a low mortality rate, resulting in a less dynamic forest.

How does leaf phenology play an important role in the seasonal drought response?


At the start of the dry season trees shed leaves and replace them with young productive leaves. Leading to a higher productivity,
compensating for the negative drought effects by the end of the dry season.

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