应用生态学报2025，Vol.36Issue(12)：3689-3698,10.DOI:10.13287/j.1001-9332.202512.020
玉米秸秆还田对白浆土水溶性有机碳及荧光特性的影响
Effects of maize straw application on water-soluble organic carbon and fluorescence characteristics of albic soil
摘要
Abstract
Albic soil is a typical low-yield soil in China,characterized by low soil organic matter content.Explo-ring the impacts of maize straw return on the water-soluble organic carbon(WSOC)content of albic soils is of great significance for improving carbon sequestration and stabilizing soil fertility.In an experiment,we added maize straw(1％of soil mass)to two subtypes of albic soil(typical and meadow albic soils)at depths of 10 cm,20 cm,and 30 cm,with no straw addition as the control,to analyze changes in WSOC content and fluorescence characteristics at 40,100,and 290 days after straw addition.Results showed that maize straw addition significantly increased WSOC content at all depths in both subtypes,with a tendency to increase over time.After 290 days,WSOC content in typical albic soil increased by 6.4％,15.7％,and 131.7％at 10 cm,20 cm,and 30 cm depths,respectively,while meadow albic soil showed increases of 8.6％,25.1％,and 54.0％at the same depths.Maize straw addition significantly decreased the water-soluble organic carbon/soil organic carbon(WSOC/SOC)ratio,indicating higher stability of SOC pool.The fluorescence index(1.15-1.79)and biogenic index(0.91-2.63)increased by 5.8％and 2.7％,respectively,while the humification index(0.25-0.62)decreased by 15.0％,suggesting that WSOC was influenced by both exogenous and endogenous substances and that straw addition led to a reduction in the humi-fication of albic soils.Analysis of the WSOC fluorescence spectra identified four components belonging to three types of substances:soluble microbial products,humic acid like substances,and protein-like substances.After the addi-tion of straw,the contents of humic acid like substances in typical albic soil decreased,while that of soluble micro-bial products and protein like substance increased.In meadow albic soil,the contents of humic acid like substances increased at depths of 10 cm and 30 cm but decreased at 20 cm;soluble microbial products increased at depths of 10 cm and 20 cm but decreased at 30 cm,while that of protein-like substances showed the opposite trend.Straw re-tuning increased the WSOC content in albic soil,promoted the formation of low-molecular-weight fluorescent com-ponents in WSOC solution,simplified the structure and enhanced the nutrient-supplying capacity.关键词
白浆土/玉米秸秆/水溶性有机碳/组分/结构Key words
albic soil/maize straw/water-soluble organic carbon/component/structure引用本文复制引用
匡恩俊,王秋菊,邹佳何,李婧阳,田立彬,姜宇,刘峰..玉米秸秆还田对白浆土水溶性有机碳及荧光特性的影响[J].应用生态学报,2025,36(12):3689-3698,10.基金项目
本文由国家重点研发计划项目(2022YFD1500800)和中央引导地方科技发展专项(ZY04JD05-002)资助. （2022YFD1500800）
