沙质河漫滩地土壤质量提升技术研究

【目的】研究沙质河漫滩地土壤质量提升技术,探索覆土改良措施对该地区土壤地力提升效益。【方法】通过对沙质河漫滩进行覆土,研究覆土材料的理化性质,进一步分析了其对土壤速效养分的影响。【结果】①覆土土壤田间持水率沙土高于黄土,黄土是沙土的1.88倍,表明黄土的保水特性远高于沙土。②通过水分特征曲线分析,黄土体积含水率高于沙土,黄土体积含水率在下降至14%以后趋于稳定,沙土饱和导水率在下降至5%以后趋于稳定,表明黄土持水性能高于沙土。③在水稻抽穗期和成熟期,表层土壤有效磷量显著高于底层,且差异显著。水稻成熟期土壤速效钾除表层量较高外,其余各土层量均较低,其中20～30 cm土层速效钾量较水稻抽穗期的量显著降低。④土壤有效磷与土壤有机质显著相关,与土壤黏粒量显著相关;有机质与土壤有效磷和速效钾著正相关。【结论】沙地覆盖黄土后土壤质量得到改善,土壤保水保肥能力显著提升。

Study on Soil Quality Improvement Technology in Floodplain of Sandy River

【 Objective 】 Study the soil quality improvement technology of sandy floodplain and explore the improvement effect of soil improvement measures on the soil fertility in this area. 【 Method 】 The physical and chemical properties of covering soil were studied in sandy beach, and the effect on soil available nutrient was further analyzed. 【Result】① The field water-holding capacity of sandy soil was higher than that of loess, and loess was1.88 times of sandy soil, which indicates that the water retention characteristics of loess were much higher than sandy soil.② Through the analysis of water characteristic curve, the water content of loess volume was higher than that of sand, and the water content of loess was stabilized after falling to 14%. The saturated hydraulic conductivity of sandy soil tends to be stable after declining to 5%, which indicated that the water holding capacity of loess Higher than sand. ③ During the heading and maturing stages of rice, the available P content in the surface soil was significantly higher than that in the bottom layer, and the difference was significant. The content of available K in20～30 cm soil layer was significantly lower than that in rice, and the content of available K in soil was higher than that in rice.④Soil available P was significantly correlated with SOM, and was significantly correlated with soil clay content. SOM was positively correlated with soil available P and available K. 【Conclusion】The soil quality was improved after the loess covered the loess, and the soil water retention and fertilizer retention capacity was significantly improved.