Soil nitrogen dynamics drive regional variation in nitrogen use efficiency in rice: A multi-scale study,European Journal of Soil Science

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Soil nitrogen dynamics drive regional variation in nitrogen use efficiency in rice: A multi-scale study
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2023-02-11 , DOI: 10.1111/ejss.13352
Xu Zhao _{1,

2} , Siyuan Cai _{1,

2} , Binggeng Yang _{1,

2} , Huicheng Zhao ₃ , Ke Zeng _{1,

2} , Pengfei Fan ₄ , Shiting Bi ₅ , Pengfei Li ₅ , Yujuan Liu _{1,

2} , Yingying Wang _{1,

2} , Xiuyun Liu _{1,

2} , Yong Yang ₄ , Wei Zhou ₁ , Bin Yin _{1,

2} , Binbin Liu ₃ , Zhenhua Zhang ₄ , Xianlong Peng ₅ , Christoph Müller _{6,

7} , Jinbo Zhang ₈ , Xiaoyuan Yan _{1,

2}

Affiliation

Northeast and East China account for ~36% of the Chinese rice cultivation area, yet considerable spatial disparities in nitrogen use efficiency (NUE) exist between these regions. The underlying causes remain poorly understood. Herein, we conducted a case study in two sample sites from two regions, Wuchang and Changshu, using multi-scale evidence chains spanning macro- and micro- processes to identify the determinants of spatial NUE variability. Field studies showed higher NUE (partial factor productivity, PFP, and agronomic efficiency, AE) but lower ammonia volatilisation in Wuchang paddy soil. By separating edaphic factors from climatic conditions, soil replacement pot studies between Wuchang and Changshu revealed that both apparent (AE and recovery efficiency, RE) and ¹⁵N-traced NUE were higher, whereas ¹⁵N fertilizer losses were lower in Wuchang-soil than Changshu-soil irrespective of site, suggesting soil type contributed to differences in soil N retention capacity and NUE of the soils. Process-scale results showed that greater rates of gross N mineralizsation (13-fold higher), gross nitrification (93% higher), and denitrification (52% higher) in Changshu-soil compared to Wuchang-soil corresponded to functional gene relative abundance, signifying larger reactive N losses and reduced soil N retention capacity. Microbial community analysis suggested that the differential N transformations were caused by differences in ammonia-oxidizing archaea (AOA) family nitrososphaeraceae and Nitrospira-like nitrite-oxidizing bacteria (NOB). This highlights the importance of specific efficiency-enhanced strategies tailored to the edaphic characteristics of cropping regions, such as increasing soil N retention capacity using enhanced-efficiency fertilizer in East China, while implementing conservation management strategies in Northeast China.

更新日期：2023-02-11

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