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.
它是由表面张力的力量保持的，没有它，水会立即从任何潮湿的表面流失，使它完全干燥。
It is held there by the force of surface tension without which water would drain instantly from any wet surface, leaving it totally dry.
它的范围包括海平面的极地地区、4500米高的干燥的亚热带地区以及3500-4500米高的潮湿的热带地区。
It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics.
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