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Table 2 Definitions of South American dry biomes

From: Forgotten forests - issues and prospects in biome mapping using Seasonally Dry Tropical Forests as a case study

Biome Annual rainfall (mm/year) Length of dry season (months) Dominant plant families Physiognomy of vegetation Notes on flora Soils Natural fire cycles Frost
Seasonally dry tropical forests
[45]
< 1,100 5-9 Leguminosae, Bignoniaceae, Euphorbiaceae, Cactaceae, Bromeliaceae Open to closed canopy forest Adaptations to drought, scarcity of perennial grasses Fertile, well drained, shallow soils. pH 6-7 Absent Absent
Savannas
[40, 68, 69]
800-2,200 3-5 Leguminosae, Myrtaceae, Vochysiaceae, Poaceae, Cyperaceae Open to wooded grasslands Fire adaptations in most plants, dominance of C4 grasses Poor, Al rich, well drained, deep soils. pH very acid (~5) Regular Absent
Chaco
[41, 42]
450-1,200 c. 5 (variable) Leguminosae (esp. Mimosoideae), Anacardiaceae, Cactaceae, Poaceae, Bromeliaceae Open to closed canopy forest, interspersed with occasional savannas Frost and salinity tolerant species with temperate affinities Saline. Sometimes very alkaline in depth (up to pH 8-9) Occasional Regular, rarely snow
  1. Comparison of the tropical dry biomes of South America and their definitions. See Werneck et al. [36] for a review on South American dry biomes.