Cattle manure and straw have contrasting effects on organic nitrogen mineralization pathways in a subtropical paddy soil
文献类型: 外文期刊
第一作者: Zhang, Yushu
作者: Zhang, Yushu;Zhang, Jinbo;Zhu, Tongbin;Cai, Zucong;Zhang, Yushu;Wang, Fei;Lin, Cheng;Zhang, Yushu;Zhang, Jinbo;Zhu, Tongbin;Cai, Zucong;Zhang, Jinbo;Cai, Zucong;Zhang, Jinbo;Cai, Zucong;Mueller, Christoph
作者机构:
关键词: N-15 tracing technique;cattle manure;gross mineralization rate;rice straw
期刊名称:ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE ( 影响因子:1.694; 五年影响因子:1.568 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Organic materials are widely recommended for the maintenance and/or accumulation of organic carbon and total nitrogen in agricultural soils. However, the relative effectiveness of different organic materials on gross N transformation and inorganic-N supply is not known. Here, a N-15 tracing incubation study was conducted to investigate the rates of gross N mineralization, nitrification, and microbial immobilization of in a paddy soil managed using different organic materials. Soil samples were collected from a rice field that has been under long-term study (30 years) and is receiving four different fertilizer treatments: no fertilizer (CK), chemical fertilizer (NPK), chemical fertilizer plus cattle manure (NPKM), and chemical fertilizer plus straw (NPKS). The samples were incubated with (NH4NO3)-N-15 or NH4 (NO3)-N-15, and the results were calculated based on a N-15 tracing model. The analysis showed that mineralization of labile and recalcitrant organic-N pools was significantly stimulated by NPKM and NPKS treatments, respectively, but not by NPK alone. Heterotrophic nitrification was negligible in all treatments. Therefore, the enhanced inorganic-N supply rates (total mineralization + heterotrophic nitrification) due to NPKM and NPKS application could be attributed to the increasing mineralization of the labile organic-N pool and recalcitrant organic-N pool, respectively. The rate of autotrophic nitrification rate was significantly increased by NPK and NPKM application, but not by NPKS application. However, both were low and unaffected by fertilizer application. Our results suggest that NPKM stimulated the processes of mineralization of the labile organic-N pool and autotrophic nitrification to increase accumulation in soil. In contrast, application of NPKS increased the rate of mineralization of recalcitrant organic-N pool but did not affect the autotrophic nitrification rate.
分类号: S`Q94
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