Root System Scanning Data with Ground Penetrating Radar (GPR) in Shandong Province, China, 2024

Two scanning schemes (a square grid scanning scheme and a concentric circle scanning scheme) were employed for detection of the triploid poplar ((P. tomentosa × P. bolleana) × P. tomentosa) root system using GPR at an antenna frequency of 1600 MHz, with a 15 cm interval, so as to non-destructively invert the spatial distribution of plant root systems.

The GPR root survey was conducted at the state-owned Jiucheng Forest Farm in Gaotang County, Liaocheng City, Shandong Province, China (116°05′25′′E, 36°48′47′′N), authorized by the Gaotang County Qingping Forest Farm Municipal Nature Reserve Management Office. During the experiment, the environment, soil, and microorganisms were not damaged.

The GPR used was the TRUTM (Tree Radar Unit) (Tree Radar, Inc, USA), operating at an antenna frequency of 1600 MHz. Two scanning schemes were employed for non-destructive detection of the root system: a square grid scanning scheme and a concentric circle scanning scheme. The square grid scanning scheme involved a total of 44 scanning lines, including 22 lines along the positive X-axis (Y000, Y015, …, Y150; Y210, Y225, …, Y360) and 22 lines along the positive Y-axis (X000, X015, …, X150; X210, X225, …, X360). Each scanning line was 3.60 m long, with a 15 cm interval between adjacent parallel scanning lines, covering a total scanning area of 12.96 m². The concentric circle scanning scheme was centered around the root collar, starting from the initial line and proceeding in a clockwise direction to complete a full circle. The length of each scanning line corresponded to the circumference of the circle, with the concentric circle radius starting at 30 cm and ending at 180 cm, increasing in increments of 15 cm, resulting in 11 scanning lines (R030, R045, …, R180) and covering an area of 10.18 m².

本研究采用方形网格扫描与同心圆扫描两种方案，借助天线频率为1600 MHz的探地雷达（Ground Penetrating Radar，GPR）对三倍体毛白杨（(P. tomentosa × P. bolleana) × P. tomentosa）的根系进行检测，扫描间隔设置为15 cm，以实现植物根系空间分布的无损反演。

本次探地雷达根系调查点位位于中国山东省聊城市高唐县国有九成林场（东经116°05′25′′，北纬36°48′47′′），相关调查工作已获得高唐县清平林场市级自然保护区管理办公室的许可。实验全程未对区域内的环境、土壤及微生物造成破坏。

本次实验使用的探地雷达为TRUTM（Tree Radar Unit）型（美国Tree Radar公司生产），其天线工作频率为1600 MHz。实验采用两种扫描方案实现根系无损检测：其一为方形网格扫描方案，共计包含44条扫描测线，其中沿X轴正方向的测线22条（编号依次为Y000、Y015、…、Y150；Y210、Y225、…、Y360），沿Y轴正方向的测线22条（编号依次为X000、X015、…、X150；X210、X225、…、X360）。单条测线长度为3.60 m，相邻平行测线的间距为15 cm，总扫描覆盖面积达12.96 m²。其二为同心圆扫描方案，以植物根颈为圆心，从初始测线开始沿顺时针方向完成整周扫描；单条测线长度对应所在圆周的周长，同心圆半径从30 cm起步，以15 cm为步长递增至180 cm，共计11条测线（编号依次为R030、R045、…、R180），总扫描覆盖面积为10.18 m²。