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根系是植物的重要组成部分,根系研究对于植物、土壤以及生态系统研究的重要意义不容忽视.植物根系的传统探测方法不仅耗时费力而且会破坏根系原生环境.因此寻求一种无损性的植物根系探测技术尤为重要.探地雷达作为一种无损性探测方法,在根系参数估算方面具有巨大潜力.利用探地雷达2GHz频率天线在根径估测方面的优势,提出一个可实际应用的粗根生物量估算新方法,即:首先通过采集少量的根样本测得平均根密度;通过探地雷达野外测量实验建立基于探地雷达波形信号的根径估测模型对根径进行估测;基于根圆柱体(短根)或长锥体(长根)假设,通过估测的根径计算出根体积;最后利用根密度和根体积计算得到根生物量.得到主要结论如下:(1)直径大于0.5cm的粗根密度相对稳定;(2)从2GHz频率天线的探测数据中提取出的波形参数ΔT与根的深度无关,据此可建立精度较高的根径估测模型;(3)基于根密度和根体积可直接估算粗根生物量,无论粗短根或粗长根,新方法均能达到较高估算精度.上述结果验证了所建立的GPR根径估测模型和根生物量估算方法的合理性和有效性.
Root system is an important part of plant, and the importance of root system research in plants, soils and ecosystems can not be ignored. The traditional detection methods of plant roots not only takes time and effort but also destroys the root system environment. Therefore, Detection technology is particularly important.Ground penetration radar as a nondestructive detection method has great potential in estimating root parameters.Based on the advantages of GPR antenna in root diameter estimation, a practical application of coarse root organism A new method for estimating the amount of root is proposed. First, the average root density is measured by collecting a small amount of root samples. The root diameter is estimated based on the ground-based radar waveform signal through field measurement of ground penetrating radar. (Short root) or long cone (long root) hypothesis, the root volume was calculated from the estimated root diameter, and finally the root biomass was calculated from root density and root volume.The main conclusions are as follows: (1) cm; (2) The waveform parameter ΔT extracted from the detection data of the 2GHz frequency antenna has nothing to do with the depth of the root, so that the fine root density can be established finely (3) Based on the root density and root volume, the crude root biomass can be estimated directly, and the new method can reach higher estimation precision regardless of the short and short root or coarse roots.The above results verify that The established GPR root estimation model and root biomass estimation method are reasonable and effective.