基于介电频谱特征参数的红壤干旱指标评价研究

Evaluation of red soil drought index based on dielectric spectrum characteristic parameters

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原文链接

国家科技期刊平台
NETL
NSTL
维普
万方数据

中文摘要：为获取红壤含水量对电磁波介电频谱的响应特征,探讨介电频谱特征参数作为红壤干旱评价指标的可行性,以红壤为研究对象,开展不同体积含水量红壤的频域介电谱(FDS)试验,提取介电谱特征曲线积分值,分析介电频谱特征参数与体积含水量的相关性,结合国家《农业干旱等级》标准提出基于介电频谱特征参数的红壤干旱评价指标.结果表明:红壤介电常数实部和虚部均随着介电频谱频率的增大而逐渐减小,两者与体积含水量均呈正相关关系;介电损耗因数随频率变化具有波动性,且体积含水量越小波动性越强,总体呈现出先减小后增大的趋势;通过最小二乘法拟合得到介电频谱特征参数与体积含水量的量化关系,采用细菌觅食算法确定最优的模型系数,拟合精度均大于0.95;基于介电谱特征参数建立红壤干旱指标评价模型,预测值与标准值之间的误差均为±1％左右.该模型能有效地评价红壤干旱程度,可为红壤区域性农业干旱调查、评估及预警提供参考指标.

外文摘要：The purpose of this study was to obtain the response characteristics of red soil moisture content to the dielectric spectrum of electromagnetic wave and discuss the feasibility of dielectric spectrum characteristic pa-rameters as the evaluation red soil drought index.The frequency domain dielectric spectroscopy(FDS)test of red soil with different volume water content was finished,and the integral value of the dielectric spectrum characteristic curves was extracted to analyze the correlation between the dielectric spectrum characteristic parameters and the vol-ume water content.Combined with the national agricultural drought grade standard,the red soil drought evaluation indexes based on dielectric spectrum characteristic parameters were proposed.The results showed that the real and imaginary parts of the dielectric constant of red soil gradually decrease with the increase of the frequency of the die-lectric spectrum,and both were positively correlated with the volumetric water content.The dielectric loss factor fluctuates with the increasing frequencies,the smaller the volumetric water content,the stronger the fluctuation,and a trend of decreasing first and then increasing was showed.The quantitative relationship between the character-istic parameters of the dielectric spectrum and the volumetric water content was given by the least square method.The bacterial foraging algorithm was used to determine the optimal model coefficients,and the fitting accuracy was greater than 0.95.Finally,the evaluation model of red soil drought index was established based on the characteristic parameters of dielectric spectroscopy.The error between the predicted value and the standard value was between± 1％.The model could effectively evaluate the degree of red soil drought degree to provide the reference indicators for regional agricultural drought investigation,assessment,and early warning in red soil.

外文关键词：

red soilfrequency domain dielectric spectroscopycharacteristic parametervolumetric water contentdrought index

作者：

王海军、徐兴倩、屈新、赵熹、王能龙、曹涵

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作者单位：

云南农业大学水利学院,云南昆明 650201

安阳工学院土木与建筑工程学院,河南安阳 455000

关键词：

红壤频域介电谱特征参数体积含水量干旱指标

基金：

国家自然科学基金云南省基础研究计划面上基金云南省高层次人才培养支持计划"青年拔尖人才"专项云南省教育厅科研项目

项目编号：

42367025202101AT070271YNWR-QNBJ-2020-0302023Y1017

出版年：

2024

DOI：

10.7606/j.issn.1000-7601.2024.01.27

干旱地区农业研究

西北农林科技大学

干旱地区农业研究

CSTPCD北大核心

影响因子：1.021

ISSN：1000-7601

年,卷(期)：2024.42(1)

参考文献量10