基于探地雷达对根系探测的限制性因素研究

Research on limiting factors of root system detection using ground penetrating radar

在探地雷达对地下根系进行探测和识别的过程中,许多因素会影响根系的分辨率。本文通过探地雷达对木薯根系进行模拟探测试验,模拟探测根系过程中的3种主要影响因素,即天线频率、根径及根系分布,并讨论了3种因素对探地雷达根系探测的影响。结果表明:在浅层土壤中,相对于低频天线,中高频天线能得到较高的根系分辨率,而1200 MHz天线频率的探测效果最佳。在干燥的砂质壤土中,中高频天线的最小识别根径是0.3 cm,但受根系深度和水平间距的影响,800 MHz天线频率探测精度减弱。可知天线频率、根径、根系埋藏深度和根系水平间距都是影响探地雷达进行根系探测的重要因素。

Several factorswill affect the resolution of root detection,in the processof detecting and identifying underground rootsby ground penetrating radar(GPR).In thispaper,the experiment of detecting cassava root by ground penetrating radar(GPR)wascarried out.Three main influencing factorsin root detection,namely antenna frequency,root diametersand root spatial distribution were simulated in the processof detecting cassava root system,and the influence of three factorson GPR root system detection wasalso discussed.The resultsshowed that,in shallow soil,the medium and high frequency antennascan get higher root resolution compared to the low frequency antennas,and the 1200 MHz antenna frequency hasthe best detection effect.In dry sandy loam,the minimum recognized root diameter of medium and high frequency antenna was0.3 cm,but it wasaffected by root depth and horizontal spacing.These resultsconfirmed that the antenna frequency,diameter of root,the depth of root,and root horizontal spacing were important influence factorsfor root detection using ground penetrating radar.