Species-household curve that similar to area-species curve of 3y fallow field showes the minimum sampling percentage were 20% based on the fit and assessment of model curve S=a+blnB. A list of folk utilizable plants found in sampling plots is attached.

• 采用曲线S =a +blnB作为农户数 -物种数曲线的拟合模型初步确定热带地区 3年轮歇地户级水平农业生物多样性的抽样比例为 2 0%25。