Abstract. Pedotransfer functions are used to relate gridded databases of soil texture information the hydraulic and thermal parameters land surface models. The within these pedotransfer uncertain calibrated through analyses point samples. How calibrations at spatial scale modern models is unclear because represent an area average. We present a novel approach for calibrating such improve model m...

Exact estimates of soil clay (<2 μm) and silt (2-20 μm) contents are crucial as these size fractions impact key soil functions, and as pedotransfer concepts based on clay and silt contents are becoming increasingly abundant. We examined the effect of removing soil organic matter (SOM) by H2O2 before soil dispersion and determination of clay and silt. Soil samples with gradients in SOM were retr...

1Assistant Professor, Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran E-mail: [email protected], Af. Member of ASCE 2Research assistant, Nanjing hydraulic research institute, Geotechnical Engineering Department, Nanjing, P.R. China E-mail: [email protected] 3Assistant Professor, Department of Soil Science, Faculty of Agriculture, Khorasgan Is...

Computer models have been used to assess soil organic carbon (SOC) stock change. Commonly, models require to determine soil bulk density (Db), a variable that is often lacking in soil data bases. To partly overcome this problem, pedotransfer functions (PTFs) are developed to estimate Db from other easily available soil properties. However, only a few studies have determined the accuracy of thes...

1443 Soil Sci. Soc. Am. J. 73:1443-1452 doi:10.2136/sssaj2008.0021 Received 23 Jan. 2008. *Corresponding author ([email protected]). © Soil Science Society of America 677 S. Segoe Rd. Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information...