落叶与氮素添加对旱地樱桃果园土壤激发效应的影响
Priming Effect of Leaf Litter and Nitrogen Addition on Dryland Cherry Orchards Soils
王静 1王弋博 1薛瑞芳 1王丹丹 1南文慧 1王华2
作者信息
- 1. 甘肃省农业固体废弃物资源化利用重点实验室;天水师范学院生物工程与技术学院,甘肃天水 741000
- 2. 陇南师范高等专科学校农林技术学院,甘肃陇南 742500
- 折叠
摘要
研究外源碳氮添加对旱地樱桃果园土壤激发效应的影响,为阐明落叶还田与氮肥对旱地果园土壤有机碳矿化作用机理提供理论依据.本实验以15a生旱地樱桃果园不同深度土壤为供试材料,采用室内恒温培养方法(25℃培养80 d),将落叶(C),氮营养(N)和落叶与氮素组合(C+N)加入表中深3个土层土壤,测量土壤CO2释放量.结果表明,与CK处理相比,C和C+N添加显著促进了各土层土壤累积CO2释放量,分别提高了 2.59倍和2.37倍,产生正表观激发效应.C和C+N添加处理的深层土壤表观激发效应显著高于表层和中层土壤,PI指数分别可达2.05、1.83.N添加处理降低了各土层土壤累积CO2释放量,为CK处理的83.75％.因此,在旱地樱桃果园中,落叶和氮素添加会产生激发效应,进而改变各层土壤原有机质的的矿化作用;深层土壤对落叶和氮素的添加更加敏感,能够产生更强的激发效应.
Abstract
In order to provide basis for understanding mechanisms of soil organic carbon mineralization under returning leaves and nitrogen fertilizer,the priming effect of exogenous carbon and nitrogen addition on dryland cherry orchards soils were studied.Three depth soil samples from 15-year-old dryland cherry orchardand were incubated at four input methods(i.e.no-input,leaf litter,urea,leaf litter and urea combinations)under controlled laboratory conditions.The experiments results showed leaf litter addition alone and leaf litter and nitrogen addition together significantly increased soil cumulative CO2 emission,induced positive apparent priming effect,and soil cumulative CO2 emission was 2.59 times and 2.37 times compared with control treatment in each soil.In the deep soil the apparent priming effect was higher than that in the top and middle soil,respectively,and PI index of deep soil reached 2.05,1.83.Nitrogen addition alone reduced cumulative CO2 emission,the soil cumulative CO2 emissions were 83.75％of that in control soil.Priming effect induce by leaf litter and nitrogen addition affected mineralization of organic carbon in dryland cherry orchards soils.The deep soil was more sensitive to the addition of leaf litter and nitrogen,which produced stronger excitation effect.
关键词
落叶/氮素/土层/累积CO2释放量/表观激发效应Key words
leaf litter/nitrogen/soil depth/cumulative CO2 emission/apparent priming effect引用本文复制引用
基金项目
甘肃省自然科学基金(21JR11RE030)
天水师范学院科学研究基金(CXJ2021-03)
出版年
2024
NETL
NSTL
万方数据