The fate of fertilizer nitrogen in a high nitrate accumulated agricultural soil

  我组成员在 Scientific Reports 发表文章:Zhi Quan, Bin Huang, Caiyan Lu, Yi Shi, Xin Chen, Haiyang Zhang & Yunting Fang. The fate of fertilizer nitrogen in a high nitrate accumulated agricultural soil[J].Scientific Reports. 2016. 

  文章链接:https://www.nature.com/articles/srep21539?code=26dc4ef9-05fb-4c5c-bde6-69a8fd28d635 

  Well-acclimatized nitrifiers in high-nitrate agricultural soils can quickly nitrify NH4+ into NO3- subject to leaching and denitrifying loss. A 120-day incubation experiment was conducted using a greenhouse soil to explore the fates of applied fertilizer N entering into seven soil N pools and to examine if green manure (as ryegrass) co-application can increase immobilization of the applied N into relatively stable N pools and thereby reduce NO3- accumulation and loss. We found that 8792% of the applied 15N-labelled NH4+ was rapidly recovered as NO3- since day 3 and only 24% as microbial biomass and soil organic matter (SOM), while ryegrass co-application significantly decreased its recovery as NO3- but enhanced its recovery as SOM (17%) at the end of incubation. The trade-off relationship between 15N recoveries in microbial biomass and SOM indicated that ryegrass co-application stabilized newly immobilized N via initial microbial uptake and later breakdown. Nevertheless, ryegrass application didnt decrease soil total NO3- accumulation due to its own decay. Our results suggest that green manure co-application can increase immobilization of applied N into stable organic N via microbial turnover, but the quantity and quality of green manure should be well considered to reduce N release from itself. 


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