Solid-State 13C Nuclear Magnetic Resonance Spectroscopic Characterization of Soil Organic Matter Fractions in a Forest Ecosystem Subjected to Prescribed Burning and Thinning

作     者：thilini d.ranatunga zhongqi he kamala n.bhat junyan zhong 

作者机构：Department of Biological&Environmental SciencesAlabama A&M UniversityNormal AL 35762(USA) USDA-ARSSouthern Regional Research CenterNew 0rlcans LA 70124(USA) Department of PhysicsChemistry and MathematicsAlabama A&M UniversityNormal AL 35762(USA) College of Sciences0ld Dominion UniversityNorfolk VA 23529(USA) IntertekAllentown PA 18195(USA) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2017年第27卷第5期

页      面：901-911页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the USDA National Institute of Food and Agriculture(NIFA),Evans Allen Grant,USA(No.224120) the National Science Foundation(NSF-CREST-CFEA),USA(No.1036600) the Agricultural Experimental Station,Alabama A&M University,Alabama,USA(Journal#:660) 

主　　题：density fractionation forest fires forest management practices forest soils fulvic acids humic acids humin particulateorganic matter 

摘      要：Forest management practices such as prescribed burning and thinning in forest ecosystems may alter the properties of soil organic matter （SOM）. In this study, surface softs from field plots in the Bankhead National Forest, Alabama, USA, were used to investigate possible SOM transformations induced by thinning and burning. Elemental analysis and solid-state 13C cross polarization magic angle spinning nuclear magnetic resonance （13C CPMAS NMR） spectroscopy were used to characterize SOM fractions in whole soils, humic substances, and density fractions. Our data revealed that the changes in SOM fractions due to the repeated burning carried out in the forest ecosystem studied were involved mainly with alkyl C, O-alkyl C, and carbohydrate functional groups, implying that most prominent reactions that occurred involved dehydrogenation, de-oxygenation, and decarboxylation. In addition, burning and thinning might have also affected the distribution and composition of free and occluded particulate SOM fractions. The limited structural changes in SOM fractions suggested that low-intensity prescribed fire in the forest ecosystem studied will not create major structural changes in SOM fractions.