黄土丘陵沟壑区沟道土壤养分分布特征研究

Distribution Characteristics of Soil Nutrients in Loess Hilly and Gully Area

【目的】了解黄土丘陵沟壑区沟道内土地复垦后土壤养分的空间分布特征,为科学治理沟道水土及土地复垦工程优化设计提供依据。【方法】通过采集从沟头至沟口8个样点0～200 cm土层土壤剖面数据,进行室内试验分析后运用SigmaPlot绘制了土壤养分分布图。【结果】黄土丘陵沟壑区沟道区土地复垦后土壤平均有效磷、速效钾及有机质量处于较低水平。有效磷及机质随土层深度的增加呈现出先减小后增大趋势,速效钾随深度的加深呈减小趋势,沟道土壤呈碱性且pH值随着土层深度的增加逐渐增大。从沟头至沟口有效磷量呈现出逐渐减小的趋势,速效钾及pH值逐渐增大。【结论】有机质空间分布特征与有效磷空间分布相似,有效磷量于沟头至沟道中部耕作层以下富集。

【Objective】Understand the spatial distribution characteristics of soil nutrients after land reclamation in the loess hilly and gully region, and provide a basis for the scientific design of the channel water and soil reclamation project.【Method】The soil nutrient distribution maps were collected by SigmaPlot after collecting the soil profile data of 8 m soil layers from the head of the ditch to the mouth of the ditch. 【Result】The average available phosphorus, available potassium and organic matter content of the soil in the channel area of the loess hilly and gully region were lower. The average available phosphorus content and organic matter content decreased first and then increased with the increase of soil depth, and the average available potassium content decreased with depth. The channel soil is alkaline and the pH value increased with the depth of the soil layer. The effective phosphorus content from the head to the gully showed a gradual decrease, and the available potassium content and pH value gradually increased.【Conclusion】The spatial distribution characteristics of organic matter are similar to the spatial distribution of available phosphorus, and the available phosphorus content is enriched below the trough head to the middle of the channel.