Systematic assessment and regional features of soil quality in the aainan Bland

The systematic evaluating model of soil quality of Hainan Island was established and the comprehensive quality of soil was evaluated．The results show that the soils in the Hainan Island have high water availability and root suitabilitv at a poor nutrition oondition．The comprehensive soil quality is at a moderate or smtable leve1．Soils under the cover of viigin forest have the best soil quality compared to those used by annual and perennial crops．