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Relationship between granitic soil particle-size distribution and shrinkage properties based on multifractal method

Pedosphere 2020年第6期30卷 853-862页

作者： Yujie WEI Xinliang WU Jinwen XIA Chongfa CAI Soil and Water Conservation Research Centre College of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementGuangdong Institute of Eco-environmental Science&TechnologyGuangdong Academy of SciencesGuangzhou 510650China

The mechanical properties of granitic residual soils vary with depth due to changes in soil type and heterogeneity caused by weathering.The purpose of this study was to relate the spatial variation of particle-size distribution(PSD)of granitic soils with soil shrinkage parameters using multifractal theory.The heterogeneity of PSD and pedogenic processes were depicted in detail by multifractal dimensions.The PSD generally increased with the increase of profile depth in accordance with the variation of single fractal dimension(D)ranging from 2.45 to 2.65.The shrinkage limit was greatly influenced by the multifractal dimension parameters,including information dimension(D1)and capacity dimension(D0)(Adjusted R2=0.998,Pshrinkage characteristic curve was fitted by the modified logistic model(R2>0.97,root sum of squaresshrinkage of granitic soils was primarily influenced by PSD and soil compactness.

关键词： bulk density fractal dimension multifractal characteristics shrinkage characteristics soil compactness

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Pilot Study to Examine Radial Variation in Annual Ring Width, Density and shrinkage

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Chinese Forestry Science and Technology 2003年第4期2卷 25-30页

作者： URAKAMI Hiroyuki HIRAKAWA Yasuhiko YAMASHITA Kana Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 ChinaForestry and Forest Products Research Institute JapanForestry and Forest Products Research Institute Japan

The annual ring width, density and shrinkage variation from pith to bark in Chinese fir (Cunninghamia lanceolata) and Boka sugi (Cryptomeria japonicd) were studied and compared. The results show that the ring width decreased sharply from pith to bark for Chinese fir. However, the ring width variation pattern for Boka sugi followed a different way, i.e., the ring width decreased to the fifth ring, increased to the tenth ring, decreased again to the fifteenth, and then increased to the twentieth, where it...

关键词： plantation wood annual ring width density variation shrinkage characteristics Chinese fir Boka sugi

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