摘要
通过对土壤水分垂直变异的分析,探讨了贵州岩溶地区黄壤坡地的土壤水分特性。研究运用小波变换对各层土壤水分序列的突变点进行了检测,根据相干谱和互谱特征分析了各层土壤水分变化的响应关系;利用相频特征研究了各层土壤之间水分变化的时滞性。结果表明,试验区各层土壤水分变化近似平稳随机过程;土壤表层至底层之间存在交替的弱透水层与弱持水层,大部土壤层的水分变化与其上层之间存在一定的时滞性。
In this paper, soil moisture vertical variance was used to analyze the moisture characteristic of soil in yellow soil sloping field of Guizhou Province. First, wavelet transform method was used to check saltation points. Second, the response of the variance of soil moisture of each layer was explored through the analysis of mutual spectrum. Last, time lag was studied by phase frequency characteristic. The results indicated that the change of soil moisture in vertical direction was an approximate random stable signal process, and the breaking phenomenon of surface layers (0-20 cm) was more than underlayers (20-100 cm), time lag was demonstrated in the changes of soil moisture in most soil layers.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2005年第3期6-11,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点科技攻关计划项目(99-021-03-06)
关键词
土壤水分
小波变换
互谱密度
soil moisture
wavelet transform
mutual spectrum
