云南红河流域冲积沙壤土结构香蕉园土壤水肥力状况研究

对云南红河流域冲积沙壤土结构的香蕉园不同深度条件下土壤水肥力状况进行监测和研究,结果表明:(1)该研究区香蕉园中土壤水pH 5.4~7.4,平均值6.08,电导率47~230μS/cm,平均值101.6μS/cm,随着土壤深度的增加,其pH、电导率逐渐减小,整体上表现为20 cm40 cm80 cm;(2)土壤水中的主要营养元素碱解氮、有效磷、速效钾在不同时间梯度、不同纵向深度具有不同的含量及变化特征,三者的平均值分别为3.49、0.015、8.7 mg/L,说明该区域内土壤水肥力状况较低,尤其缺乏磷肥;(3)相关性分析说明,除20 cm深度土壤水中的碱解氮、有效磷、速效钾具有一定相关性外,其他不同纵向深度土壤水中的碱解氮、有效磷、速效钾不具有显著相关性,变化差异较大。

Soil Water and Fertility Status of Banana Plantations in the Alluvial Sandy Loam in Honghe-river Drainage Areas

In this paper, the soil water fertility was monitored and studied under the different depth soil in the banana plantation of the alluvial sandy loam structure in Honghe-river drainage area, the results showed that： （1）The soil water pH of the banana plantation was 5.4~7.4 in this studied area, the average was 6.08;and the conductivity was 47~230 μS/cm, the average was 101.6 μS/cm. The soil water pH and conductivity has decrease with the increase of soil depths on the whole, their value as： 20 cm 〉 40 cm 〉80 cm. （2） The main nutrition elements hydrolyze nitrogen、 available phosphorus、 effective potassium had different content and characteristics under the different periods, and different depth. the average content for the solution as： hydrolyze nitrogen 3.49 mg/L, available phosphorus 0.015 mg/L, effective potassium 8.7 mg/L, it was indicated that the fertility status of the soil water was low within the region, especially lack of phosphate fertilizer. （3） The correlation analysis shows that except the soil water hydrolyze nitrogen, available phosphorus, effective potassium form 20 cm deep has some correlations, but others has not significant relationships which form different depths soil water, and their differences has large. This study has important implications for guiding fertilization of banana.