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| 黄壤坡地土壤水分垂直变异特征分析 | |
| 引用本文： | 蒋太明,刘海隆,刘洪斌,肖厚军,夏锦慧. 黄壤坡地土壤水分垂直变异特征分析[J]. 农业工程学报, 2005, 21(3): 6-11 |
| 作者姓名： | 蒋太明 刘海隆 刘洪斌 肖厚军 夏锦慧 |
| 作者单位： | 1. 贵州省农业科学院,贵阳,550006 2. 西南农业大学资源环境学院土壤系,重庆,400716 3. 西南农业大学资源环境学院土壤系,重庆,400716;中国科学院地球化学研究所,贵阳,550005 |
| 基金项目： | 国家重点科技攻关计划项目(99-021-03-06) |
| 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。 |
| 关 键 词： | 土壤水分； 小波变换； 互谱密度 |
| 文章编号： | 1002-6819(2005)03-0006-06 |
| 收稿时间： | 2004-02-17 |
| 修稿时间： | 2004-10-08 |
Analysis of vertical variation characteristic of soil moisture in yellow soil sloping field |
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| Jiang Taiming,Liu Hailong,Liu Hongbin,Xiao Houjun and Xia Jinhui. Analysis of vertical variation characteristic of soil moisture in yellow soil sloping field[J]. Transactions of the Chinese Society of Agricultural Engineering, 2005, 21(3): 6-11 | |
| Authors: | Jiang Taiming Liu Hailong Liu Hongbin Xiao Houjun Xia Jinhui |
| Abstract: | In this paper, soil moisture vertical variance was used to analyze the moisture characteristic of soil in yellow soil sloping field of GuizhouProvince. 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, andthe 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. |
| Keywords: | soil moisture wavelet transform mutual spectrum |
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