Population Structure and Spatial Distribution Patterns of a Naturally Regenerated Jatropha curcas L.Population in a Dry Hot Yuanmou Valley in Yunnan Species composition and diversity characteristics of Quercus franchetii communities in dry hot valley of Jinsha River The Drought Resistance of Acacia and Eucalyptus in Yuanmou Dry-hot Valley Yunnan Province INITIAL STUDY ON VEGETATION REHABILITATION IN YUAN MOU DRY HOT VALLEY