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Dielectric properties of saline soil based on a modified Dobson dielectric model

ISSN号：1007-4929
期刊名称：《节水灌溉》
时间：0
分类：S543.9[农业科学—作物学] TQ320.662[化学工程—合成树脂塑料工业]
作者机构：[1]Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China, [2]Earth and Environmental Studies, Montclair State University, Montclair 07043, USA
相关基金：The study was supported by International Science ＆ Technol- ogy Cooperation Program of China （2010DFA92720-12）, the Xinjiang Regional Youth Scientific-technical Talent Training Engineering Project （2013711014）, the National Natural Sci- ence Foundation of China （U1303381, 41261090, 41130531） and the New Century Excellent Talents Supporting Plan of the Ministry of Education of China （NCET-12-1075）.

作者： Nigara TASHPOLAT[1], DING Jianli[1], YU Danlin[2]

关键词：盐渍土壤, 电模型, 介电特性, 渭干河-库车河三角洲, 新疆维吾尔族自治区, 后向散射系数, 土壤含水量, 介电常数, saline soil, dielectric constant, dielectric constant model, backscattering coefficient, Radarsat-2 images

中文摘要：

土壤 salinization 是为在干旱区域的农业开发的一颗主要担心。在这份报纸，一个修改多布森电介质模型被使用在 Xinjiang Uygur 自治区域的 Ugan-Kuqa 河三角洲绿洲模仿盐的土壤的绝缘的常数，西北的中国。模型表演通过在在雷达 backscattering 系数之间的土壤电介质常数和盐的土壤的绝缘的常数上分析它的参数的影响被检验。学习的结果显示那：(1 ) 土壤电介质常数的真实部分被土壤水内容在低雷达频率影响；想象的部分仔细与土壤水内容和土壤盐被联系内容。(2 ) 土壤水和盐内容与辩证损失的系数被联系，它与在干旱区域的盐的土壤的自然条件一致并且为土壤电介质性质的学习提供珍贵参考书。(3 ) 土壤水内容和土壤的变化腌内容在盐的土壤的绝缘的常数上有立刻的影响。随后，雷达 backscattering 系数被影响对盐的土壤的绝缘的常数作出回应。雷达 backscattering 系数对有 R ²=0.75 的一个关联系数的雷达十字极化模式很负责。这研究提供一个潜在的方法监视土壤 salinization 并且由使用一个土壤电介质模型和雷达技术玷污水内容。

英文摘要：

Soil salinization is a major concern for agricultural development in arid areas. In this paper, a modified Dobson dielectric model was applied to simulate the dielectric constant of saline soil in the Ugan-Kuqa river delta oasis of Xinjiang Uygur autonomous region, northwestern China. The model performance was examined through analyzing the influences of its parameters on the soil dielectric constant and the relationship between radar back- scattering coefficient and the dielectric constant of saline soil. The results of the study indicate that：（1） The real part of the soil dielectric constant is affected by soil water content at low radar frequencies; the imaginary part is closely related with both the soil water content and soil salt content. （2） The soil water and salt contents are related with the coefficient of dialectical loss, which is consistent with the natural conditions of saline soil in arid areas and provides valuable references for the study of soil dielectric properties. （3） The changes of soil water content and soil salt content have instant influences on the dielectric constant of saline soil. Subsequently, the radar backscattering coefficient is affected to respond to the dielectric constant of saline soil. The radar backscattering coefficient is most responsible to the radar＇s cross polarization pattern with a correlation coefficient of R2=0.75. This study provides a potential method to monitor soil salinization and soil water content by using a soil dielectric model and radar tech- niques.

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