Potential N mineralization and availability to maize in black soils in response to soil fertility improvement in Northeast China

文献类型： 外文期刊

第一作者： Fu, HaiMei

作者： Fu, HaiMei;Duan, YingHua;Xu, MingGang;Fu, HaiMei;Zhu, Ping;Gao, HongJun;Xu, MingGang;Yang, XiaoMei;Yang, XiaoMei

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关键词： Black soil zones; Soil fertility; Potentially mineralized nitrogen (N-0); Nitrogen fertilization; Environmental impacts

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期：

页码：

收录情况： SCI

摘要： Purpose Understanding the soil nitrogen (N) mineralization potential (N-0) and crop N availability during the growing season is essential for improving nitrogen use efficiency (NUE) and preventing over-fertilization, which lead to negative environmental impacts. Methods Five black soils with different levels of fertility were selected in Northeast China. TheN(0)and kinetics of these soils were estimated through laboratory experiments at different incubation temperatures (15, 25, and 35 degrees C). N mineralization dynamics were simulated using field soil temperature according to the incubation results. Moreover, the N uptake dynamics of maize were simulated according to the literature. Results Compared with the very low-fertility soils, the cumulative mineralized nitrogen increased under all incubation temperatures (15, 25, and 35 degrees C), by 48-136%, 8-61%, and 24-59%, respectively, in the medium- and high-fertility soils. The highestN(0)values (96.90, 115.31, and 121.33 mg/kg at the three different temperatures) were recorded in the very high-fertility soils. The soil N mineralization dynamics and N uptake of maize in the growing season were highly consistent over time, although the soil N supply could not meet the maize growth requirements. The higher the soil fertility, the lower the N fertilizer requirement. Conclusions Different fertilizer strategies were developed based on the cumulative mineralized N, N uptake by maize, and NUE in soils with different fertility levels. We suggested a reduction of 50-65 kg N/ha in N fertilizer in the two highest fertility soils. This study provided basic data to reduce chemical N fertilizer to improve NUE and reduce negative environmental impacts.

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