北京林业大学学报2024，Vol.46Issue(12)：63-70,8.DOI:10.12171/j.1000-1522.20230018
季节性氮添加对内蒙古温带典型草原土壤净氮矿化的影响
Effects of seasonal nitrogen addition on soil net nitrogen mineralization in typical temperate grasslands of Inner Mongolia,northern China
摘要
Abstract
[Objective]This study aimed to explore the effects of seasonal nitrogen(N)addition on soil inorganic N pool and N mineralization rates in temperate steppe grasslands.It focused on revealing monthly dynamics,interannual variations,and environmental driving mechanisms to support understanding soil N cycling and its relationship with atmospheric N deposition.[Method]A field experiment was established with N addition applied in different seasons:autumn,winter,and the growing season.Inorganic N content and N mineralization rates were measured by top-cover PVC cylinders method to explore the effects of seasonal N addition on net N mineralization potential.[Result]Compared with control,N addition significantly increased inorganic N pools but declined over time.Compared with N addition in autumn and winter,N addition in growing season significantly increased inorganic N by 226.5%.The response of ammonium N,nitrate N and inorganic N to N addition in different seasons showed obvious seasonal pattern.Meanwhile,N addition in different seasons significantly increased the rate of N mineralization.At the end of growing season,net ammonification rate showed a trend of decreasing first and then increasing after N addition in growing season.N addition in growing season significantly increased net nitrification rate and net N mineralization rate at the end of growing season.N mineralization rate showed significantly monthly and interannual changes to N addition in different seasons.The response of mineralization rate to N addition in different seasons was mainly influenced by environmental factors.It was found that temperature had a negative effect on nitrification rate and net N mineralization rate,while precipitation had a positive effect.N addition in different seasons was main factor causing the difference of N mineralization rate.[Conclusion]Seasonal N addition significantly alter soil inorganic N pools and mineralization rates in temperate grasslands,showing notable seasonal and interannual patterns with experimental time.In conclusion,study of the effects of different seasonal N addition on soil N mineralization provides theoretical support for in-depth understanding of response rule and mechanism of soil N conversion process to atmospheric N deposition.It also helps to comprehensively evaluate the relationship between seasonal effects of atmospheric N deposition and soil N cycle.关键词
季节性氮添加/无机氮/土壤/氮矿化/温带草原Key words
seasonal nitrogen addition/inorganic nitrogen/soil/nitrogen mineralization/temperate grassland分类
农业科技引用本文复制引用
王小双,陈俊刚,张云海,余新晓..季节性氮添加对内蒙古温带典型草原土壤净氮矿化的影响[J].北京林业大学学报,2024,46(12):63-70,8.基金项目
国家自然科学基金项目(32171589、32122055、32071603),国家自然科学基金重点项目(42230714). （32171589、32122055、32071603）
