植物营养与肥料学报2025，Vol.31Issue(8)：1482-1490,9.DOI:10.11674/zwyf.2024615
施肥和根际效应对玉米光合碳在土壤团聚体中固存的影响
Sequestration characteristics of photosynthetic carbon of maize in soil aggregates respond to fertilization and rhizosphere effect
摘要
Abstract
[Objectives]The purpose of this study was to investigate the characteristics of photosynthetic carbon(C)sequestration in rhizosphere and non-rhizosphere soil aggregates under different fertilization treatments,and to quantify the contribution of photosynthetic C to organic C of soil aggregates,so as to provide theoretical basis for C sequestration and sustainable development of farmland soil.[Methods]Based on the long-term experimental station of Shenyang Agricultural University,this study selected no fertilization(CK)and chemical fertilization(NPK)treatment plots to repeatedly conduct the in-situ13 CO2 pulse labeling for many times from booting to tasseling stage of maize.The rhizosphere and non-rhizosphere soil samples were taken destructively at the matured period of maize,and the wet sieving method was used to separate different sizes of soil aggregates,and the organic C content and δ13 C value in each soil aggregates were measured.[Results]Rhizosphere effect significantly affected the proportions of>0.25 mm and<0.053 mm aggregates in soil,and the proportion of>0.25 mm aggregate was higher in CK treatment than that in NPK treatment,while the proportion of<0.053 mm aggregate was lower in CK treatment than that in NPK treatment.Fertilization significantly affected the content of 13 C fixed in each size aggregate,and the contribution of 13 C to organic C within the 0.25-0.053 mm and<0.053 mm aggregates.Rhizosphere effect significantly affected the content of fixed 13 C and its contribution to organic C in 0.25-0.053 mm aggregate;the interaction effect between fertilization and rhizosphere effect significantly affected the content of 13 C fixed in 0.25-0.053 mm aggregate,and the contribution of 13 C to organic C within the 0.25-0.053 mm and<0.053 mm aggregates.Compared with CK treatment,the content of 13 C fixed in>0.25 mm aggregates of rhizosphere soil was 41.80%lower,but that of non-rhizosphere soil was not significantly different,that in 0.25-0.053 mm aggregates of rhizosphere and non-rhizosphere soils were 20.43%and 126.19%higher in NPK treatment,respectively.The content of 13 C fixed in 0.25-0.053 mm aggregate of rhizosphere soil was 121.43%and 17.89%higher than that of non-rhizosphere soil under CK and NPK treatments,respectively.Compared with CK treatment,NPK treatment significantly reduced the contribution of the fixed 13 C to organic C within<0.053 mm aggregates by 52.17%in rhizosphere and by 20.00%in non-rhizosphere soil,and doubled that in 0.25-0.053 mm aggregates of non-rhizosphere soil.In the CK treatment,the 13 C contribution of fixed 13 C in<0.053 mm aggregates of rhizosphere soil was 15.00%higher than that of non-rhizosphere soil,but was 45.45%higher in NPK treatment.[Conclusions]Photosynthetic C is mainly fixed in>0.25 mm soil aggregates.Fertilization reduces the fixation of photosynthetic C in>0.25 mm soil aggregate,enhances that in 0.25-0.053 mm aggregates,especially in rhizosphere soil.And fertilization significantly decreases the contribution of photosynthetic C to organic C of<0.053 mm aggregate of rhizosphere soil.Therefore,rhizosphere effect enhances photosynthetic C fixation in 0.25-0.053 mm aggregates,but weakens that in<0.053 mm aggregate.关键词
光合碳/土壤团聚体/13C脉冲标记/施肥处理/根际效应Key words
photosynthetic carbon/soil aggregates/13C pulse labeling/fertilization treatment/rhizosphere effect引用本文复制引用
张鑫,祝腾霄,梅秀文,李玉萍,田春花,安婷婷,汪景宽..施肥和根际效应对玉米光合碳在土壤团聚体中固存的影响[J].植物营养与肥料学报,2025,31(8):1482-1490,9.基金项目
辽宁省科学研究经费项目(JYTYB2024065). （JYTYB2024065）
