中国土壤与肥料Issue(1)：35-44,10.DOI:10.11838/sfsc.1673-6257.24175
半干旱区玉米秸秆还田方式对土壤富里酸含量及其结构特征的影响
The effect of returning corn straw to the field in semi-arid areas on the content and structural characteristics of soil fulvic acid
摘要
Abstract
In order to clarify the changes in soil organic carbon components under different straw returning methods,this study was based on a 7-year long-term positioning experiment of straw returning.Three-dimensional fluorescence spectroscopy technology was used to analyze the soil organic carbon content,fulvic acid content,and structural characteristics under CK(no straw returning),FG(straw covering returning),FM(straw burying returning)and FH(straw mixed returning)treatments.The results showed that:(1)Different straw returning methods were more conducive to the accumulation of soil organic carbon and fulvic acid content in the surface layer(0-10 cm).Among them,straw covering returning treatment was the best,followed by straw burying returning treatment.Compared with CK treatment,the organic carbon and fulvic acid content increased by 16.86%,16.80%and 67.30%,57.21%,respectively.FG and FH treatments reduced soil organic carbon content by 7.67%and 3.68%in the 30-40 cm soil layer,respectively.FG treatment reduced the content of fulvic acid in the sub surface layer(20-30 and 30-40 cm),while FH treatment reduced the content of fulvic acid in the soil layer of 30-40 cm by 25.19%.(2)The sources of fulvic acid in soil humus were influenced by both endogenous and exogenous sources.FM treatment showed an increase in FI,BIX and HIX in the four soil layers compared to CK.This indicated that FM treatment had a higher degree of soil humification and better stability in different soil layers.(3)The three-dimensional fluorescence spectrum and fluorescence region integration indicated that FM,FG and FH treatments all increased humic acid substances,resulting in a higher degree of humification and a more complex structure.Three fluorescent components were identified in this experimental area.Among them,Component 1(Excitation/Emission=330/410)and Component 3(Excitation/Emission=270,370/460)were both humic acid substances,mainly derived from organic matter produced by the decomposition of higher plants;Component 2(Excitation/Emission=230,260/415)was a fulvic acid substance;The higher the relative content of Component 3,the higher the degree of soil humification.Compared with CK,the relative content of Component 3 in FM treatment increased by 3.8%-15.44%in the four soil layers.In summary,burying and returning straw to the field was the best way to increase soil humification and enhance soil fertility.关键词
半干旱区/秸秆还田方式/土壤富里酸/荧光结构Key words
semi-arid areas/straw returning method/soil fulvic acid/fluorescent structure引用本文复制引用
高盼,王宇先,李欣洁,蔡姗姗,徐莹莹,杨慧莹,张巩亮..半干旱区玉米秸秆还田方式对土壤富里酸含量及其结构特征的影响[J].中国土壤与肥料,2025,(1):35-44,10.基金项目
黑龙江省省属科研院所科研业务费项目(CZKYF2024-1-B004). （CZKYF2024-1-B004）
