PLANT EFFECTS ON SOILS IN DRYLANDS: IMPLICATIONS FOR COMMUNITY DYNAMICS AND ECOSYSTEM RESTORATION

摘要

Almost 50% of the emerged land (6.15 10(> ha) are considered drylands (Reynolds and Stafford Smith, 2002). They are distributed in four continents, covering from 31% (South America) to 75% (Australia) of the continental land area. Drylands encompass areas with a wide range of conditions in relation to the ratio Precipitation/Evapotranspiration (P/E), from hyperarid (P/E<0.03) to Dry Subhumid (0.5