摘要
根据四川盆地丘陵区重庆市璧山县青杠墒情站点土壤水分每天的动态监测资料，用小波分析的谱相分析方法研究了土壤水分的垂直异质性。结果表明：土壤水分变化是个随机平稳的波动序列；就时间变异来看，其变异有一定的隐周期，大致可分为3～5月的次波动期、7～9月的剧烈波动期、10～2月的相对稳定期。就土壤的垂向变化来看，站点的0～10cm的变异高于10-20、20-40cm层变异；各层变异之间存在一定的因果关系，可用互谱密度系数表示。但受降水、蒸发、作物利用等多种因素的制约，并未表现出完全的同步响应关系。
The present study used soil moisture to investigate the temporal-spatial distribution of moisture in the topsoil in soil moisture inspected sites Qinggan. Wavelet transform method was used to find periods of soil moisture and check saltation point and the response of the variance of soil moisture of each layer was explored through the analysis of mutual spectrum. The main results show that the change of soil moisture in vertical direction was an approximate random stable signal process. The seasonal dynamics of soil moisture can be divided into three stages： soil water stable stages （from Oct to Feb）, depleting stage （from Mar to May）, and unstable stage （from Jul to Sep）. And the breaking point of surface layer （0-10 cm） was more than underlayers（20-40 cm）, time lag was demonstrated in the changes of soil moisture in most soil layers, their changes in different layers are not the same.
出处
《灌溉排水学报》
CSCD
北大核心
2009年第2期98-100,共3页
Journal of Irrigation and Drainage
基金
教育部科技创新工程重大项目培育资金项目(706049)
