Long-term effects of nitrogen fertilization on aggregation and localization of carbon, nitrogen and microbial activities in soil

文献类型： 外文期刊

第一作者： Wang, Yidong

作者： Wang, Yidong;Wang, Zhong-Liang;Li, Yong;Xue, Dongmei;Zou, Chris B.;Kuzyakov, Yakov;Wang, Yidong;Wang, Zhong-Liang;Li, Yong;Xue, Dongmei;Zhang, Qingzhong;Lou, Yilai;Hu, Ning;Li, Zhongfang;Chen, Yi;Wu, Chunyan;Zou, Chris B.;Kuzyakov, Yakov

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关键词： Aggregate formation; Enzyme activity; PLFAs; Mineral fertilizer; Soil organic carbon; Soil structure

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2018 年 624 卷

页码：

收录情况： SCI

摘要： Long-term nitrogen (N) fertilization affects soil aggregation and localizations of soil organic carbon (SOC), N and microbial parameters within aggregates. The mechanisms of these N effects are poorly understood. We studied these processes in a loamy soil from a 23-year repeated N addition field experiment under a rice-barley rotation. Nitrogen fertilization increased plant productivity and the portion of large macroaggregates (>2 mm). However, SOC contents in macro- and micro-aggregates remained constant despite an N-induced increase of 27% in root C input into soil. Therefore, N fertilization accelerated SOC turnover. Nitrogen addition increased total N (IN) content in bulk soil and two macroaggregates (>2, and 1 2 mm). but not in microaggregates (<025 mm). Also, N fertilization increased the phospholipid fatty acids (PLFAs) contents of fungi in the large macroaggregates, but not in the microaggregates. In contrast, the effect of N addition on contents of bacterial and total microbial PLFAs was not apparent Nitrogen fertilization increased N-acetyl-13-D-glucosaminidase (NAG) activities in the two larger macroaggregate size classes (>2, and 1-2 mm), but not in the aggregates (<1 mm). In both control and N fertilization, the large macroaggregates localized more TN, microbial PLFAs, and NAG activities than the microaggregates. In conclusion, long-term N fertilization not only directly promotes soil N resource but also indirectly improves soil structure by forming large macroaggregates, accelerates SOC turnover, and shiftes localization of microorganisms to the macroaggregates. (C) 2017 Elsevier B.V. All rights reserved.

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