一、前言海南岛南部和两南部滨海地区,除了土壤瘦瘠之外,冬春季节长期干旱,在无灌溉条件下,农作、热作一般均不宜种植,只有腰果树,由于能耐旱耐瘠,生长良好,有相 I. Introduction Coastal areas in the south of Hainan Island and the south of the two areas are long-awaited in spring and winter in addition to soil leaching. Under non-irrigated conditions, farming and heating are generally not suitable for planting. Only cashew trees can tolerate drought and barrenness , Grow well, with phase