基于不同质地分类的紫色土颗粒组成转换研究
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中图分类号：S152.3 文献标识码：A 文章编号：1673-9868（2026）02-0170-10
Abstract： To achieve the conversion of soil texture data between the International System and the United
States Department of Agriculture System，this study used cubic spline interpolation method， piecewise cubic Hermite interpolation method and fractal model to construct the conversion model of different particle size content of purple soil，based on the particle composition data of 143 purple soil samples. The conversion value and actual value of cubic spline interpolation method and the contents of particles in the [0.002，0.02） mm range and [0，0.05）mm were correlated by one-dimensional linear equation，onedimensional quadratic equation and SVR model. MAE and RMSE were used to evaluate the conversion accuracy of each model. The results showed that： ① The cubic spline interpolation method and piecewise cubic Hermite interpolation method had poor conversion effect，while the fractal model had better effect. The SVR model or the quadratic fitting equation y=-0. 001 90x2+0. 981 90x-4. 141 30 were used to correct the prediction of the content of particles [0，0.05）mm by cubic spline interpolation. The quadratic fitting equation y=0. 004 83x2+0. 909 44x+3. 639 24 were used to correct the prediction of the content of the particles [0，0.02）mm by cubic spline interpolation method. The corrected cubic spline interpolation method achieved higher conversion accuracy. ② The quadratic fitting equation （204号 3.76953x-5.76368 achieved the convenient conversion from [0.002，0.02）mm particle content to （20 [0，0.05）mm particle content，but the conversion error of some samples were large. Through the SVR model or the quadratic fitting equation y=0. 001 08x2+0. 309 65x-0. 481 06 ， the convenient conversion from the content of particles [0， 0. 05）mm to the content of particles in the [O.Oo2，0.O2） mm range were achieved，and the conversion accuracy was high.
Key words： purple soil; soil particle composition; soil texture; texture conversion model
土壤质地是根据土壤颗粒组成划分的土壤类型，反映了土壤的自然属性，对土壤肥力有着极大的影响，对制定土壤利用与管理规划、进行土壤改良意义重大[1]。（剩余11710字）
