农业环境科学学报2017，Vol.36Issue(2)：322-328,7.DOI:10.11654/jaes.2016-1131
玉米秸秆不同还田方式对黑土有机碳组成和结构特征的影响
Effect of different ways of corn stover application to soil on composition and structural characteristics of organic carbon in black soil
摘要
Abstract
The practice of corn stover application to soil is an important measure to improve soil fertility and increases soil organic matter.However,the influence of different ways of corn stover application on humus composition and humic acid structural characteristics in soil is not well understood.The black soil of micro area corn field at the Jilin Agricultural University was taken as the research object,and three treatments were set as follows:CK(No corn stover incorporated),C 1 (corn stover incorporated to shallow layer),C2 (corn stover deep incorporation).Fulvic acid (FA),humic acid(HA) and humin (HM) were extracted by the modified humus component method,and purified HA was prepared by IHSS method,and to measure its structural properties of element composition,infrared spectroscopy and differential thermal property.As the results show:Corn stover application to soil improved the organic carbon contents of soil humic components significantly,PQ values of soil humus (the radio of HA proportion in ex-tractable humus) increased significantly.compared with CK,the C 1 treatment of SOC,HA,FA and HM in the surface soil(0～20 cm) significantly increased by 21.8％,27.3％,11.5％ and 30％ respectively,The C2 treatment of SOC,HA,FA and HM in the subsurface soil(20～40 cm) significantly increased by 26.3％,32％,13.4％ and 31.9％ respectively.It was found that C1 and C2 treatments could reduce the condensation degree,oxidation degree and thermal stability of HAs,increase the content of aromatic-C and aliphatic chain hydrocarbon,and make HA simpler in structure.These changes were representative in surface soil for the HA of C 1 treatment,compared with CK,the (O+S)/C ratio decreased by 11.3％,the aliphatic-C/aromatic-C ratio(2920/1620) increased obviously by 23.4％.On the other hand,for the HA of C2 treatment,above changes mainly appeared in subsurface soil,the (O+S)/C ratio was 9.1％ lower than CK,the aliphatic-C/aromatic-C ratio(2920/1620) significantly increased by 23％ compared with CK.It has great significance to clarify the mechanism of improving soil fertility and to guide the practice of corn stover application to soil.关键词
玉米秸秆/不同还田方式/土壤有机碳组成/结构特征Key words
corn stover/different application ways/soil organic C composition/structural characteristics分类
资源环境引用本文复制引用
董珊珊,窦森..玉米秸秆不同还田方式对黑土有机碳组成和结构特征的影响[J].农业环境科学学报,2017,36(2):322-328,7.基金项目
吉林省秸秆综合利用平台项目(2014C-1) （2014C-1）
国家自然科学基金项目(41571231) （41571231）
国家重点研发计划项目(2016YFD0200304)The Jilin Provincial Straw Platform for Comprehensive Utilization,China(2014 C-1) （2016YFD0200304）
The National Natural Science Foundation of China(41571231) （41571231）
National Key Research Projects of China(2016YFD0200304) （2016YFD0200304）
