滴灌条件下核桃土壤水分空间变异性  

Study on Spatial Variability of Soil Moisture for Walnut under Drip Irrigation

作　　者：周世军[1] 雷晓云[1] 李芳松[1] 谢训园[1] 潘婷[1] 

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《节水灌溉》2011年第3期9-11,共3页Water Saving Irrigation

基　　金："十一五"国家科技支撑计划项目(2007BAD38B02)(2007BAD38B05);国家自然科学基金项目(51060002);新疆自治区高技术研究与发展计划项目(200712111);新疆水利水电工程重点学科基金资助项目

摘　　要：在新疆阿克苏地区温宿县核桃林场30 m×60 m(一根支管控制)的范围内,布置土壤水分监测点共计435个。利用地统计学方法,研究了核桃在滴灌条件下田间土壤含水率在空间上的变异规律,以便为核桃滴灌自动化灌溉系统中墒情监测传感器的合理布设及墒情预测提供理论依据。结果表明,滴灌条件下的采样幅度一定时,增大采样间距对土壤水分变异系数没有影响;各采样间距的土壤水分具有中等程度的空间相关性,且随着采样间距的增大,空间相关度变化不大,说明滴灌条件微尺度上的空间变异性受采样间距的影响不太显著;沿滴灌带方向的空间相关度明显大于垂直滴灌带方向,即沿滴灌带方向由结构性因素引起的变异更大,具有强烈的空间带状结构。A total of 435 soil moisture monitoring points in 30 m× 60 m（a branch controls） were layout in Walnut Forestry Centre of Aksu district of Xinjiang.The spatial variability of soil moisture under drip irrigation of walnut fields was analyzed by using geology-statistics method to provide guideline for the soil moisture monitoring program and soil moisture prediction.The results indicated that augmenting the sampling spacing made no difference with variance coefficient of soil moisture while sampling extent was invariable under drip irrigation.The field soil moisture was moderate spatial autocorrelation under different sampling spacing.As the sampling spacing was augmenting,spatial autocorrelation had few diversification.It indicated that the sampling spacing has inapparent influence to spatial variability on micro-scale of drip irrigation.The spatial autocorrelation under the direction of the capillary was obviously bigger than that of branch pipe.Namely the variety under the direction of the capillary caused by structural factor was more evidence and the variability had a strong spatial zonal structure.

关 键 词：空间变异性 土壤含水率 滴灌 核桃 

分 类 号：S152.7[农业科学—土壤学]