biol 215 - content after midterm 2

top three most populated countries? are they also the most dense?

1. china - pretty dense

2. india - very dense

3. US - not dense

what are the three methods of deforestation and how do they forest ecosystems?

(a) selective cutting - most eco friendly option but most expensive

• removal of single trees by helicopter

• small gaps are created in the canopy, allowing sunlight to reach the forest floor; letting seedlings grow

• similar to natural disturbances

(b) variable retention - also eco friendly but expensive (road construction)

• Some trees are removed, but a portion of the original forest is left behind

• ~10–30% of the original trees are retained in each cut block

• The remaining trees help maintain some forest structure and habitat (good for wildlife)

( c) clear cutting - very invasive

• remove all trees in patches up to 2000 ha

what are lateritic soils? is it high in nutr

highly weathered soils commonly found in tropical regions, especially areas with warm temperatures and heavy rainfall.

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