Sensitive factors analysis in using GPR for detecting plant roots based on forward modeling
Sensitive factors analysis in using GPR for detecting plant roots based on forward modeling
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发表时间：
2012
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通讯作者：
C. Jin
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作者：
C. Jin
根系在植物生态系统中起着至关重要的作用。传统的根系测量方法破坏性大、劳动强度大，限制了采样数量和大小的可管理性。探地雷达(GPR)是一种非破坏性的根系分析方法，已被证明是一种可行和有效的根系检测方法。然而，很难从探地雷达雷达图中识别出根。由于根系的复杂性和根际的异质性，使得探地雷达在根系探测中的应用变得困难，通过将模拟结果与田间试验结果进行对比，验证了利用基于时域有限差分(FDTD)理论的探地雷达剖面正演模拟软件GprMax进行根部探地雷达反射剖面建模的可行性，并通过建立不同的正演模型，分析了敏感因素对探地雷达探测植物根系的影响。模拟结果表明，天线频率、根系形态、根含水率、根大小和深度对根系探地雷达剖面有明显的影响。
Roots play a crucial role in plant ecosystem.Traditional methods for roots measurements are destructive and labor intensive,limiting the manageability of the size and number of sampling.Ground-penetrating radar(GPR),a nondestructive root analysis method,has already been testified as a feasible and efficient root detection method. However,it is difficult to idetify roots from GPR radargrams. The complexity of root systems and heterogeneity of rhizosphere make the application of GPR to root detection arduous.The feasibility of using GprMax,a GPR profile forward simulation software based on Finite Difference Time Domain(FDTD)theory,for root GPR reflection profiles modeling was validated by comparing simulation results and field experiment results.Furthermore,through developing various forward simulation models,the effect of sensitive factors in using GPR for detecting plant roots was analyzed.Simulation results show that antenna frequency,root system configuration,root water content,root size and depth have obvious impact on root GPR profiles.Conclusions from this paper will help the interpreting of roots GPR reflection profiles and the application of GPR to root detection.