数字农科院2.0

Temperature Sensitivity Of Soil Organic Matter Mineralization Decreases With Long-Term N Fertilization: Evidence From Four Q(10) Estimation Approaches

文献类型： 外文期刊

作者： Zang, HD; Blagodatskaya, E; Wen, Y; Shi, LL; Cheng, F; Chen, HQ; Zhao, BQ; Zhang, FS; Fan, MS; Kuzyakov, Y

作者机构：

关键词： activation energy; carbon and nitrogen turnover; nitrogen fertilization; recalcitrant and labile carbon; soil warming

期刊名称： LAND DEGRADATION & DEVELOPMENT

ISSN： 1085-3278

年卷期： 2020 年 31 卷 6 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Climate warming and anthropogenic nitrogen (N) loads are two major global change components interactively affecting carbon cycling. However, the effects of N forms and amounts on temperature sensitivity (Q(10)) of soil organic matter (SOM) mineralization remain incomplete. With this goal, soil was sampled after 23 years of mineral and (or) organic N fertilization, and then incubated for one year at 10, 20, and 30 degrees C. For the first time, we compared four approaches (Equal time, Equal C, 1-C pool, and 2-C pool model) to evaluate the Q(10) of SOM mineralization. All approaches showed that the Q(10) decreased by more than one third with N fertilization compared to unfertilized control at low temperatures. The '1-C pool model' was not adequate for Q(10) estimation with various C availability. The Q(10) estimated by '2-C pool model' was strongly depended on incubation duration. The 'Equal C' approach was more powerful for separating SOM pools and it revealed the decreased Q(10) of the recalcitrant pool at high N rates. The impact of N fertilization on Q(10) was more evident at high N than at low N. Notably, the Q(10) decreased more by mineral N compared to organic fertilizers (similar to 60% vs. similar to 40% decreased in Q(10)) at 10-20(o)C. The added benefit of N fertilization in protecting SOM under climate warming was demonstrated by decreased Q(10). Such one-third reduction of temperature sensitivity by N fertilization is large enough to be considered in predictions of global SOM stocks under warming and anthropogenic N loads.

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