Soil nitrogen sequestration in a long-term fertilizer experiment in central China

文献类型： 外文期刊

第一作者： Han, Xuemei

作者： Han, Xuemei;Hu, Cheng;Chen, Yunfeng;Qiao, Yan;Liu, Donghai;Fan, Jun;Li, Shuanglai;Zhang, Zhi;Han, Xuemei

作者机构：

关键词： soil total N concentration; N storage; N sequestration rate; long-term fertilizer experiment; rice-wheat cropping system

期刊名称：SPANISH JOURNAL OF AGRICULTURAL RESEARCH （ 影响因子：1.238； 五年影响因子：1.731 ）

ISSN： 1695-971X

年卷期： 2020 年 18 卷 1 期

页码：

收录情况： SCI

摘要： Aim of study: To evaluate the effects of a long-term manuring and fertilization experiment on the soil total N concentration and its storage and sequestration rates in the rice-wheat cropping system. Area of study: A rice-wheat rotation area in central China. Material and methods: A 35-yr long-term fertilizer experiment was conducted with 9 treatments: unfertilized (Control), N, P, and K fertilizers, manure (M) and M combined with N, P, and K fertilizers treatments. Soil total N input amount, total N concentration, total N storage amount and N sequestration rate in soil were calculated. Main results: The soil total N input amount, N concentration, N storage amount and N sequestration rate were significantly influenced by M and chemical fertilizers. In total, 0.017-0.021 g N/kg soil accumulated in the organic M plots, whereas only 0.005-0.007 g in chemical fertilizer alone plots. The highest soil total N storage amount was 6.09 t/ha in the M alone plot, and the lowest value was 4.46 t N/ha in the N fertilizer alone plot. The highest N sequestration rate in soil was 0.061 t N/ha/yr in the high amount M plus NPK fertilizers plot, and the lowest value was 0.002 t N/ha/yr in the N fertilizer alone plot. A significant nonlinear regression relationship existed between the total N sequestration rate in soil and annual total N input amount. Moreover, the average soil total N concentration was significantly positively correlated with the average grain yield of crop and soil organic C concentration. The soil total N sequestration rate in M alone or M combined with inorganic fertilizer treatments were increased compared with inorganic fertilizer alone treatments. Research highlights: Considering crop yields and total N sequestration rate in soil, the use of manure combined with inorganic fertilizer should be recommended in the rice-wheat cropping system.

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