Incorporation of Biochar Carbon into Stable Soil Aggregates:The Role of Clay Mineralogy and Other Soil Characteristics

作     者：Charlene N. KELLY Joseph BENJAMIN Francisco C. CALDERON Maysoon M. MIKHA David W. RUTHERFORD Colleen E. ROSTAD 

作者机构：West Virginia UniversityDivision of Forestry and Natural Resources337 Percival HallMorgantownWV 26506USA USDA-ARSCentral Great Plains Research Station40335 County RoadGGAkronCO 80720USA U.S.Geological SurveyMS 408PO Box 25046Building 95Denver Federal CenterDenverCO 80225USA 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2017年第27卷第4期

页      面：694-704页

核心收录：

学科分类：0818[工学-地质资源与地质工程] 09[农学] 090101[农学-作物栽培学与耕作学] 0903[农学-农业资源与环境] 0901[农学-作物学] 

主　　题：aggregate size fractions, aggregate stability, mineralogy, soil strength, water-holding capacity, weathered soil 

摘      要：Aggregation and structure play key roles in water-holding capacity and stability of *** this study,the incorporation of carbon(C) from switchgrass biochar into stable aggregate size fractions was assessed in an Aridisol(from Colorado,USA) dominated by 2:1 clays and an Alfisol(from Virginia,USA) containing weathered mixed 1:1 and 2:1 mineralogy,to evaluate the effect of biochar addition on soil *** biochar was applied at 4 levels,0,25,50,and 100 g kg^(-1),to the soils grown with wheat in a growth chamber *** changes in soil strength and water-holding capacity using water release curves were *** the Colorado soil,the proportion of soil occurring in large aggregates decreased,with concomitant increases in small size *** changes in aggregate size fractions occurred in the Virginia *** the Colorado soil,C content increased from 3.3 to 16.8 g kg^(-1),whereas in the2 000 μm *** greatest increase(from 6.2 to 22.0 g kg^(-1)) occurred in the 53–250 μm *** results indicated that C was incorporated into larger aggregates in the Virginia soil,but remained largely unassociated to soil particles in the Colorado *** addition had no significant effect on water-holding capacity or strength *** biochar to more weathered soils with high native soil organic content may result in greater stabilization of incorporated C and result in less loss because of erosion and transport,compared with the soils dominated by 2:1 clays and low native soil organic content.