水铁矿对小麦秸秆腐解衍生溶解性有机质的分馏作用
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中图分类号：X71 文献标志码：A 文章编号：2095-6819（2025）05-1309-14 doi：10.13254/j.jare.2025.0045
Fractionation of dissolved organic matter derived from wheat straw decomposition by ferrihydrite
WANG Xiaoyang'，TANGXiaodan'，LUOYajuan1，WANG Siyu1，NIUChengjian1，YANNal.2，MA Shuanglong1* （1.College ofesourcesndEnvioent，HenanAgriculturalUiversityZngzou4o6，na;2.SjiuangLngquanake GardenAffairs Center，Shijiazhuang O5O2Oo，China）
Abstract：Wheatstraw-deriveddissolvedorganicmater（WSDOM）isakeysubstratedriving themetabolismof decomposing microrganissandcorelinkcordinatingtheresourceutilzatioofgricultualwaste，teimprovementofsoilfunctios，theulatio ofenvironmentalrisks，ndteacievemntofaboneutraltgoals.Tosystematicallevealtheoleularompositioadstructral dynamiccharacteristicsofWSDOMandclarifythefractionationefectofgoethiteonitscomponents，thisstudyanalyedthelight absorptionproperties，molecularweightdistribution，fluorescencecomponents，andfunctionalgroupevolutionofWSDOMduring decompositionthroughmultiplespectroscopictechniquesandfractionationexperiments.Theresultsshowedthatasdecomposition progressed over 7-day cycles， SUVA254 ，SUVA26o，and A253/A203of WSDOM decreased from 1.73，1.68，and0.32 to 0.91，0.88，and 0.23， respectively，while E2/E3 significantlyincreasedfromtheinitial2.74to3.41，indicatingagradualdecrease inaromaticityandtheformation ofwater-isolubleacromoleularumus.Additioalytheelatiecotentofprotei-lkesubstanesinWireasdfro0.75 ondayOofdecompositiotoO81ondy3andtendeceasedtoO78onday7whileterelativecotentsfulvicacid-lkeadmc acid-likesubstancesdecreasedfrom0.172and0053onday0to0.144and0.044onday3andthenincreasedto0.202and0070onday 7.TheadsortionetofgoeteoWOatdieretecomposiidysassificantlyirentwitedsooetn WSDOM on day 3 being the most prominent，with an adsorption capacity（calculated in C）of up to 52.835mg⋅g-1 . During the decompositionprocess，protein-likesubstancesandvolatilefatyacidsweredecomposed，andunstablefulvicacid-likesubstances gradualltransfoeditous.Goethitedasigiantfractionatioetoigaroaticitygolelareghtdye containingcomponentsinWSDOM.Theresearchresultsprovideacertaintheoreticalbasisfordevelopingeficientandrapidstraw decompositiontechnologies，improvingtheefciencyofstrawresourceutilizationandthecarbonsequestrationandcarbonsink enhancement capacity of farmland soil.
Keywords：wheat straw; decomposition; dissolved organic matter; ferrihydrite; fractionation
小麦秸秆作为我国农业生产的重要副产品，年产量高达数亿吨。（剩余21937字）
