摘要
【目的】明晰有机肥和秸秆还田调控紫色土有机碳组分的效应,揭示有机肥和秸秆还田增强土壤固碳的机制。【方法】以川中石灰性紫色土为对象,采用田间试验和室内分析研究不同施肥处理对土壤有机碳组分及稳定性的影响,施肥处理包括不施肥(CK)、NPK化肥配施(NPK)、单施猪厩肥(OM)、猪厩肥配施NPK化肥(OMNPK)和秸秆还田配施NPK化肥(CRNPK)。【结果】各施肥处理下土壤4个有机碳组分的含量表现为高氧化活性有机碳组分(F_(1))>稳定有机碳组分(F_(4))、中氧化活性有机碳组分(F_(2))>低氧化有机碳组分(F_(3)),F_(1)组分为氧化有机碳的优势组分,占总有机碳(TOC)含量的60.18%~74.08%。与CK相比,NPK、OMNPK仅分别显著增加F_(3)和F_(1)组分含量,F_(1)、F_(2)、F_(3)和F_(4)组分在OM处理下分别显著提高51.87%、112.50%、440.00%和102.17%,在CRNPK处理下F_(1)~F_(4)组分分别显著提高79.80%、103.13%、300.00%和94.57%。稳定性较高的氧化有机碳组分(F_(3)+F_(4))占TOC比例在不同施肥处理间的增幅大小顺序为OM>NPK、CRNPK>OMNPK;OM的有机碳的活性系数较CK显著降低8.46%,稳定系数比CK显著提高55.75%。土壤有机碳各组分与TOC呈极显著正相关,F_(1)还与氮、磷存在极显著正相关。【结论】秸秆还田配施氮磷钾化肥能在显著提升高活性有机碳含量的同时增加稳定性有机碳的占比,是一种能协调有机碳矿化与固持,增加有机碳固存的优选农田管理措施。高氧化活性有机碳对土壤质量变化最为敏感,更适合作为指示环境条件变化对土壤质量影响的诊断指标。
【Objective】To clarify the effects of manure and corn residue on organic carbon fractions of purple soil,and to reveal the mechanism of manure and corn residue to enhance soil carbon sequestration.【Method】Taking the calcareous purple soil in central Sichuan as the object,field experiments and laboratory analysis were used to study the effects of different fertilization treatment on the fractions and stability of soil organic carbon.The fertilization regimes include no fertilization(CK)and compound application of NPK(NPK),single application of pig manure(OM),pig manure combined with synthetic NPK fertilizer(OMNPK),and corn residue combined with synthetic NPK fertilizer(CRNPK).【Result】The content of four soil oxidized organic carbon fractions under each treatment ranked in the order of high oxidative active organic carbon(F_(1))>Stable organic carbon(F_(4))&medium oxidized active organic carbon(F_(2))>low oxidized active organic carbon(F_(3));among which F_(1) is the dominant fraction of oxidized organic carbon,accounting for 60.18%-74.08%of the total organic carbon(TOC)content.Compared with CK,NPK and OMNPK only significantly increased the content of F_(3) and F_(1) respectively;F_(1),F_(2),F_(3) and F_(4) were significantly increased by 51.87%,112.50%,440.00%,and 102.17%in OM,and79.80%,103.13%,300.00%,and 94.57%in CRNPK,respectively;The order of the increase in the ratio of more stable oxidized organic carbon fractions(F_(3)+F_(4))to TOC between different fertilization treatments is OM>NPK,CRNPK>OMNPK;The activity coefficient of soil organic carbon in OM was significantly reduced by 8.46%,while the stability coefficient of soil organic carbon was significantly increased by 55.75%.Each soil oxidized organic carbon have a very significant positive correlation with TOC,and F_(1) also has a very significant positive correlation with nitrogen and phosphorus.【Conclusion】Corn residue combined with synthetic NPK fertilizer can significantly increased not only the content of high activity organic carbon,but
作者
邓明位
张思佳
朱波
李梦
蒲玉琳
DENG Mingwei;ZHANG Sijia;ZHU Bo;LI Meng;PU Yulin(College of Resources,Sichuan Agricultural University,Chengdu 611130,China;Key Laboratory of Mountain Surface Processes and Ecological Regulation,Chinese Academy of Sciences,Chengdu 610041,China)
出处
《四川农业大学学报》
CSCD
北大核心
2021年第2期205-211,共7页
Journal of Sichuan Agricultural University
基金
国家自然科学基金(41401328)
四川农业大学创新训练计划项目(201710626118)。
关键词
施肥方式
紫色土
氧化有机碳组分
活性系数
稳定系数
fertilization regimes
purple soil
oxidized organic carbon fractions
activity coefficient
stability coefficient
