Priming Effect of Leaf Litter and Nitrogen Addition on Dryland Cherry Orchards Soils
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.
leaf litternitrogensoil depthcumulative CO2 emissionapparent priming effect
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