云南河口不同土地利用方式下的土壤养分变化

摘要

Three kinds of plantations were selected to study the nutrition status in soil, and the change in soil nutrients of lands for different purposes was analyzed. Results indicated that it has the highest soil organic matter and hydrolyze nitrogen in He-vea rubber plantation, with the lowest pH value and available phosphorus, the effective potassium content is in the medium level. In avocado orchard, all pH value, organic matter, hydrolyze nitrogen are in the medium level and its available potassium is the lowest. In banana plantation, pH value and the content of available potassium are the highest but organic matter is the lowest. In general, soil nutrients in banana plantation shows better performance, then are the Hevea plantation and avocado or-chard. There is only significant difference in pH value and available phosphorus between Hevea plantation and avocado or-chard. There is no significant difference among the other nutrients index and it is a positive correlation with each other.%选取云南河口橡胶园、油梨园和香蕉园的3种热带作物作为研究对象，通过研究其土壤 pH、有机质、碱解氮、有效磷和速效钾等指标，分析不同土地利用方式下的土壤养分变化状况。结果显示：3种热带作物中橡胶园有机质、解碱氮最高，pH、有效磷最低，速效钾居中；油梨园土壤 pH、有机质、解碱氮、有效磷均为中间水平，速效钾最低；香蕉园土壤 pH、有效磷、速效钾含量最高，有机质最低。总体来看，香蕉园土壤养分水平相对较高，橡胶园中等，油梨园中等偏下，这些养分指标中仅有橡胶园和油梨园土壤 pH、有效磷之间存在极显著差异，各土壤养分之间为一般正相关关系，差异不显著。