CAJ | 학술논문

土层厚度对林地生产力具有重要影响，是评价林地土壤质量的重要指标。为了对林地土壤的土层厚度进行调查，该文应用电阻率断层扫描技术对林地土壤土层厚度进行了研究，对其可适用性做出评价。通过在野外试验点对土壤电阻率的实地断层扫描，将其结果与实际测定得到的基岩特征电阻率相结合，预测土层厚度，并将预测值和实地基坑开挖数据进行比较。结果表明，研究区土层厚度多在小于2 m的范围内，电阻率断层扫描技术估测结果与实测结果相符（均方根误差为0.2678），初步表明该技术在估算林地土层厚度方面具有良好的适用性。该研究结果为土壤学方面相关研究提供重要手段，也将对土壤质量评价和土地利用等相关工作提供指导。
토층후도대임지생산력구유중요영향，시평개임지토양질량적중요지표。위료대임지토양적토층후도진행조사，해문응용전조솔단층소묘기술대임지토양토층후도진행료연구，대기가괄용성주출평개。통과재야외시험점대토양전조솔적실지단층소묘，장기결과여실제측정득도적기암특정전조솔상결합，예측토층후도，병장예측치화실지기갱개알수거진행비교。결과표명，연구구토층후도다재소우2 m적범위내，전조솔단층소묘기술고측결과여실측결과상부（균방근오차위0.2678），초보표명해기술재고산임지토층후도방면구유량호적괄용성。해연구결과위토양학방면상관연구제공중요수단，야장대토양질량평개화토지이용등상관공작제공지도。
Soil thickness is the key index for the soil quality evaluation and has great effect on the productivity and properties of the forested soils. Soil thickness is commonly defined as the distance from the soil surface to the bedrock. The direct estimates of bedrock depth through drilling steel or from destructive boreholes and pits are too expensive and laborious in large areas, for the study area is often far away from the road and large tools are not accessible. Geophysical method seems to be a possible non-invasive and efficient alternative. Among available techniques, ground penetrating radar, seismic waves or sound waves often provide confusing or even wrong information, which prohibits the signal to go deeper from the shallower rocks. However, electrical resistivity tomography (ERT) offers interesting assets. The electrical resistivity depends on a number of soil textural and structural characteristics and can be regarded as a proxy of many soil properties. The electrical resistivity of the soil is found to be sensitive to the soil inclusion such as the tunnel or rocks. The ERT provides the electrical image of subsurface soil, and the result provided is easy to be explained and straightforward. It has been proved that the approach is suitable to investigate heterogeneous soils having components with contrasted electrical resistivity. This is often the case in soil between the soil matrix and the bedrock. In this research, the ERT was applied to the stony forested soils to study the soil thickness, and the applicability of the ERT was evaluated. Electrical resistivity of the soil samples overlying the bedrock was measured in the lab with four-electrode method and characterized as 48-640?m. Electrical resistivity of the bedrock was obtained by data extraction from the ERT surveys and measured on site using four-electrode method, and the results showed that the electrical resistivity of the bedrock could be characterized as 1 200-1 600?m. The two-dimensional ERT was carried on site with gradient electrode array and the results were inversed by RES2DINV; finally the inversed resistivity section were combined with the characteristic electrical resistivity of the bedrock and its overlying soils to estimate the soil thickness. The estimated results by the ERT were compared to the real soil thickness obtained by digging pits. The results indicated that the soil thickness varied between 0 and 2 m in the Mt-ventoux hilly area located in the south of France. The estimated results fitted well with the real soil thickness measured by digging pits with root mean square error (RMSE) of 0.2678 andR2 of 0.8223. Thus the excellent applicability of the ERT to the soil thickness evaluation was proved on the forested soils. In this research, the transition between the bedrock and soil surface was found in the field, and the electrical properties of the transition were studied. And still, the applicability of the ERT was verified on account of the transition between the bedrock and soil surface, which is not common in the literature available. The method proposed showed higher accuracy and indicated that the applicability of the ERT for soil thickness distribution evaluation. In the future research, the method will be tried to apply to the soil dry layer which is popular in the Loess plateau and to evaluate the applicability. Soil moisture and temperature has great effect on the soil electrical resistivity, so the soil moisture and temperature is suggested to be measured in the field in order that the results more fit the reality. The research will provide an important tool for the problems related to soil and will be an important aid for the soil quality evaluation and land utilization.