实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
在《稀树大草原的秘密》一书中，他们发出了非洲应当控制人口的强烈呼唤。
In the book "Secrets of the Savanna", they issued a strong call that Africa should control its population.
一些稀树大草原生长在潮湿、涝渍的土壤上；其它则在干燥、多沙、排水良好的土壤上。
Some savannas occur on wet, waterlogged soils; others on dry, sandy, well-drained soils.
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