Phosphorus addition enhances gross microbial N cycling in phosphorus-poor soils: a N-15 study from two long-term fertilization experiments

文献类型： 外文期刊

第一作者： Cheng, Yi

作者： Cheng, Yi;Cai, Zucong;Wang, Jing;Sun, Nan;Xu, Minggang;Zhang, Jinbo;Zhang, Jinbo;Cai, Zucong;Wang, Shenqiang

作者机构：

关键词： Phosphorus deficiency; P availability; N dynamics; Gross N mineralization; N-15 recovery

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2018 年 54 卷 6 期

页码：

收录情况： SCI

摘要： The tight coupling between nitrogen (N) and phosphorus (P) suggests that P availability may affect soil microbial N dynamics in terrestrial ecosystems. However, how P addition affects the internal N transformations in P-deficient agricultural soil remains poorly understood. We hypothesized that an increase in gross microbial N rates in P-deficient soil should occur after long-term P inputs in agricultural soils. We thus conducted a N-15 pool dilution experiment to quantify the gross microbial N transformation rates after long-term mineral fertilizer applications in an upland fluvo-aquic soil (from Fengqiu with pH 8.55) and upland red soil (from Qiyang with pH 5.49) in China. We found that P addition significantly enhanced the gross N mineralization and immobilization rates when N and K were also applied, probably due to the increased soil total C and N concentrations at both soils. Also, gross nitrification rate was stimulated by P addition, perhaps because of enhanced gross N mineralization rates and associated NH4 (+) substrate availability. Our results showed that long-term P addition may stimulate soil gross N dynamics and hence increase overall N availability for crops in P-deficient agricultural soils.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序