灌溉方式对半干旱区侧柏人工林土壤理化性质的影响

Effects of Irrigation Methods on Soil Physical and Chemical Properties of Platycladus Orientalis Plantation in Semi-arid Region

为探究黄土高原半干旱区不同灌溉方式对侧柏人工林土壤理化性质的影响,在兰州市小青山水土保持科技示范园区侧柏人工林地选取喷灌、穴灌和漫灌3个灌溉处理开展试验,通过田间试验与室内分析相结合的方法,分析不同灌溉方式下土壤理化指标的变化特征。结果表明,不同处理侧柏人工林土壤含水量、孔隙度及持水量均随土层深度的增加而减小,土壤容重表现出相反的趋势。不同灌溉方式下,喷灌地土壤容重和含水量均小于漫灌地,孔隙度和持水量均大于穴灌地和漫灌地。不同灌溉方式的土壤养分指标也有所不同,土壤有机碳、全氮、水解性氮、速效钾基本均随土层深度的增加而减小,且表现为喷灌地>漫灌地>穴灌地,土壤pH、有效磷变化无明显规律。3种灌溉方式中喷灌改善土壤理化性质的效果最好,是一种更适合于侧柏人工林的灌溉措施。

In order to investigate the effects of different irrigation methods on soil physical and chemical properties of platycladus orientalis plantation in semi-arid of loess plateau,the changes of soil physical and chemical indexes under sprinkler irrigation,hole irrigation and flood irrigation were conducted through the combination of field experiment and laboratory analysis in Xiaoqingshan soil and water conservation science and technology demonstration in Lanzhou.The results showed that soil water content,porosity and water holding capacity decreased with the increase of soil depth,while soil bulk density showed an opposite trend.The soil bulk density and water content in sprinkler irrigation were lower than those in flood irrigation,while porosity and water holding capacity were higher than those in hole irrigation and flood irrigation.Soil nutrient indexes were also different under different irrigation methods,the soil organic carbon,total nitrogen,hydrolysable nitrogen and available potassium decreased with the increase of the soil depth with the order of sprinkler irrigation>hole irrigation>flood irrigation,while the soil pH and available phosphorus had no obvious change regularity.Among the three irrigation methods,sprinkler irrigation had the best effect on improving soil physical and chemical properties,and was a more suitable irrigation measure for platycladus orientalis plantations.