期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/srep21539
关键词
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资金
- National Natural Science Foundation of China [41001176]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB15020200]
- Liaoning Science and Technology Project Program [2011215003, 2014215016]
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 87-92% of the applied N-15-labelled NH4+ was rapidly recovered as NO3- since day 3 and only 2-4% 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 N-15 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 didn't 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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