干旱区生态环境知识资源中心(Arid): 干旱区盐渍土介电常数特性研究与模型验证

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	干旱区盐渍土介电常数特性研究与模型验证
其他题名	Constant characteristic and model verification of saline soil dielectric in arid area
	雷磊; 塔西甫拉提·特依拜; 丁建丽; 江红南; 姚远; 孙永猛; 夏军; 阿尔达克·克里木
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2013
卷号	29 期号:16 页码:125-133
中文摘要	常用的土壤介电模型一般都是针对非盐渍化土壤提出来的,对于干旱区盐渍化土壤,模型对于介电常数虚部的描述与实际测量情况有一定差距。为了更好地深入研究干旱区盐渍化土壤介电常数特性,该文选择盐渍土介电模型(修正的含水含盐土壤 Dobson 介电模型)作为典型研究区盐渍化土壤介电常数的基础模型,模拟分析土壤介电常数对模型参数的响应,在野外实测数据的支持下验证了盐渍土介电模型的适用性。研究结果表明:1)在低频区域(0.5
英文摘要	Due to its unique superiority on soil property monitoring, microwave remote sensing is considered to be one of the most valuable means of soil property detection. Being a property of soil related to moisture in arid and semiarid regions, the salinity of soil has negative impact on crop yield. But there is little formal study corresponded to the application of microwave remote sensing on monitoring of soil salinity. Additionally, the dielectric properties are the basis of microwave remote sensing for earth observation, and also the key parameters of relationship establishment between the backscattering coefficient and soil parameters (moisture, salt content). In the present study, the corrective moist salt soil Dobson dielectric model was adopted as a fundamental model to simulate the soil dielectric constant. We also analyzed the response of soil dielectric constants to model parameters and verified the applicability of the corrective moist salt soil Dobson dielectric model by using field collected data at Wei-kuqa river oasis. We found that:1) In low frequency regions (i.e., 0.5< f < 5 GHz), soil dielectric constant has an obvious response to soil volumetric water content and soil salt content;2) With a relatively high correlation coefficient (R>0.95) of the corresponding linear regression model, the soil moisture content significantly correlated to the real part of soil dielectric constant; 3) Based on obvious response of imaginary part of soil dielectric constant to soil salt content (R=0.86), soil salt content determines the value of soil dielectric constant imaginary part. In the low frequency region, soil dielectric constant significantly correlated to the volumetric water content and soil salt content. In all frequency regions of studied electromagnetic wave, the real part of permittivity had a significant response to the soil volumetric water content, and it increased with the increasing of water content. As to the imaginary part of the permittivity, dielectric constant slightly increased with the decreasing of water content, which indicated the soil moisture directly determined the real part of soil dielectric constant. Imaginary part of the soil dielectric constant apparently responded to soil salinity, and the soil salt content obviously determined the imaginary part of the dielectric constant, especially in the lower frequency. We concluded that the corrective moist salt soil Dobson dielectric model can objectively describe the soil dielectric constant and the values estimated were approximate to the measured soil dielectric constant. This research showed that the soil dielectric constant can be used to monitor the degree of soil salt content, water content and soil salinization, and it is feasible to use the saline soil dielectric model to invert the soil salinity.
中文关键词	盐分 ; 土壤 ; 模型 ; 介电常数 ; 干旱区
英文关键词	saline soil models dielectric constant arid area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4905197
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229901
作者单位	新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	雷磊,塔西甫拉提·特依拜,丁建丽,等. 干旱区盐渍土介电常数特性研究与模型验证[J]. 新疆大学,2013,29(16):125-133.
APA	雷磊.,塔西甫拉提·特依拜.,丁建丽.,江红南.,姚远.,...&阿尔达克·克里木.(2013).干旱区盐渍土介电常数特性研究与模型验证.农业工程学报,29(16),125-133.
MLA	雷磊,et al."干旱区盐渍土介电常数特性研究与模型验证".农业工程学报 29.16(2013):125-133.