水田和旱地铁氧化物对红壤团聚体碳固持的影响 -pg电子娱乐平台

doi:10.12357/cjea.20230241长期不同施肥水田和旱地铁氧化物对红壤团聚体有机碳固持特性的影响[j].中国生态农业学报(中英文),2023,31(9):14281438xueironoxidescarbonsequestrationcharacteristicsredsoilaggregatespaddyfieldsuplandundervaryinglong-termfertilizationpractices[j].chinesejournaleco-agriculture,2023,31(9):14281438长期不同施肥水田和旱地铁氧化物对红壤团聚体有机碳固持特性的影响江西省红壤及种质资源研究所/农业农村部酸化土改良与利用重点实验室　南昌　331717;中国农业科学院农业资源与农业区划研究所/耕地培育技术国家工程实验室　北京　100081;山西农业大学生态环境产业技术研究院/土壤环境与养分资源山西省重点实验室　太原　030031)红壤中铁氧化物是影响有机碳固持的主要因素之一。探究红壤旱地和水田土壤有机碳与不同形态铁氧化物的关系,有助于理解土壤有机碳的稳定机制,为农田合理管理提供科学依据。本文依托我国南方红壤旱地和水田长期施肥定位试验(均超35分别采集长期不施肥(ck)、单施氮肥(n)、氮磷钾配施(npk)和npk与有机肥配施(npkm)种施肥处理的土壤样品,采用沙维诺夫干筛法获得土壤大团聚体mm)和微团聚体(0.25mm),测定土壤团聚体有机碳含量及络合态、游离态和无定形等形态铁氧化物的含量。水田土壤大、小和微团聚体的平均有机碳含量分别为8.21gkg、7.65gkg2.08gkg而旱地分别为2.93gkg、6.68gkg和1.33gkg水田土壤大、小和微团聚体中的平均可溶性有机碳含量分别为70.72mgkg79.83mgkg和30.29mgkg而旱地分别为7.27mgkg、21.49mgkg和5.88mgkg。无论是旱地还是水田,土壤小团聚体和微团聚体无定形铁氧化物含量与土壤有机碳含量均呈显著正相关关系,土壤各粒级团聚体无定形铁氧化物含量与可溶性有机碳含量均呈显著正相关关系。水田土壤各粒级游离态铁氧化物含量与土壤有机碳含量均呈显著正相关关系,尤以微团聚体贡献率较高。水田条件下,土壤微团聚体中的游离态铁氧化物含量与可溶性有机碳含量呈显著正相关关系。随着土壤团聚体粒级的增加,铁氧化物含量表现为先增加后降低的趋势。无定形铁氧化物对旱地和水田土壤有机碳均具有固持作用,游离态铁氧化物仅对水田土壤有机碳具有固持作用。关键词:红壤;旱地;水田;施肥;土壤有机碳;铁氧化物中图分类号:s153开放科学码(资源服务)标识码(osid):effectsironoxidescarbonsequestrationcharacteristicsredsoilaggreg-atespaddyfieldsuplandundervaryinglong-termfertilizationpracticesxueyikangliukailouwuleiwangbinzhangwenjuxuminggangliyu’ecaiandong国家自然科学基金项目(42007073)和江西省“双千计划”项目(jxsq2020102116)资助通信作者:**娥,主要从事农田温室气体排放核算与减排技术研究,e-mail:liyue@caas.cn;主要从事土壤碳循环研究,e-mail:caian-dong@caas.cn主要从事土壤碳循环研究。e-mail:xyk@caas.cn收稿日期:2023-05-05　接受日期:2023-06-01nationalnaturalsciencefoundationchina(42007073)doublethousandplan”projectjiangxiprovince(jxsq2020102116).correspondingauthors:liyu’e,e-mail:liyue@caas.cn;caiandong,e-mail:caiandong@caas.cnreceivedmay2023;acceptedjun.2023中国生态农业学报(中英文)　2023chinesejournalofeco-agriculture,sep.2023,31(9):14281438http://www.ecoagri.ac.cnsustainabledevelopmentagriculture,chineseacademyagriculturalscienceskeylaboratoryagriculturalenvironment,ministryruralaffairs,beijing100081,china;jiangxiinstituteredsoilgermplasmresourceskeylaboratoryacidifiedsoilameliorationutilization,ministryruralaffairs,nanchang331717,china;agriculturalresourcesregionalplanning,chineseacademyagriculturalsciencesnationalengineeringlaboratoryimprovingqualityarableland,beijing100081,china;industrialtechnology,shanxiagriculturaluniversityshanxiprovincekeylaboratorysoilenvironmentnutrientresources,taiyuan030031,china)abstract:ironoxideredsoilcriticalfactorregulatingsoilorganiccarbonsequestration.ourobjectiverela-tionshipbetweensoilorganiccarbonironoxidepaddies,whichstabilizationmechanismsoilorganiccarbonprovidesscientificguidancerationallanduse.basedpaddylong-termfertil-izationexperiments(over35years)redsoilsouthernchina,designedtreatmentsincludedfertilizercontrol(ck),chemicalnitrogen chemicalnitrogen, phosphorus, potassiumfertilizers (npk), npkcombined manure(npkm). according dryscreening soilaggregates obtainlarge soil macroaggregates mm),small aggregates (0.252 mm), microaggregates(0.25 mm). all soil aggregates were used determinesoil organic carbon, soil dissolved organic carbon, complex iron oxide, free iron oxide, amorphous iron oxide, ironactivity. compared ck,npk npkmtreatments uplandsdecreased soil macroaggregates significantlyincreased soil small aggregates npkmtreatments paddyreduced soil macroaggregates increasedsmall aggregates. averageorganic carbon contents soilaggregates were 8.21, 7.65, 2.08gkg paddyfields, 2.93,6.68, 1.33gkg uplands,respect- ively. averagecontents dissolvedorganic carbon macroaggregates,small aggregates paddysoils were 70.72, 79.83, 30.29mgkg respectively,whereas those uplandsoils were 7.27, 21.49, 5.88mgkg