数字农科院2.0

Long-term cultivation of indica–japonica hybrid rice reshapes the sustainability of rice systems by simultaneously enhancing yield, nitrogen use efficiency, and soil health

文献类型： 外文期刊

作者： Jinjia Gan;Xinyue Xu;Sheng Tang;Kefeng Han;Tao Sun;Jinzhao Ma;Xiangde Yang;Xiu Liu;Haoran Fu;Zhihao Pang;Lingli Mao;Lianghuan Wu;Qingxu Ma

作者机构：

关键词： Indica–japonica hybrid rice;Long-term field experiment;Nitrogen use efficiency;Soil quality index

期刊名称： European Journal of Agronomy

ISSN： 1161-0301

年卷期： 2026 年 175 卷

页码：

收录情况： SCIE（2025版）

摘要： Indica–japonica hybrid rice (IJHR) integrates the superior traits of indica rice and japonica rice (JR), with advantages in yield, Nitrogen (N) use efficiency (NUE), and root carbon (C) input. To assess its sustainability, a 9-year field experiment was conducted comparing the IJHR and JR under equivalent N applications. IJHR achieved higher grain yield and NUE and lower apparent N surplus than did JR. Compared with JR, IJHR increased soil organic matter (SOM) by 15.8 %, dissolved organic C and N by 37.0 % and 66.0 %, respectively, and microbial biomass C by 26.8 %. The activities of C- and N-cycling enzymes increased by up to 106 %. These enhancements contributed to a 129.8 % improvement in the soil quality index (SQI) compared to that of the JR. Random forest analysis identified aboveground biomass, NUE, and dissolved organic C as the main yield drivers. SQI improvements were attributed mainly to SOM accumulation and root-derived C inputs, reinforced by enzyme-mediated C and N cycling. A higher SQI further enhanced the yield. Partial least squares path modeling demonstrated that IJHR achieves a higher yield primarily through an increase in the number of spikelets per panicle, mediated by root-driven improvements in soil quality. NUE enhancement was driven mainly by greater plant N uptake. These findings provide a process-based framework linking root traits, soil biochemical functioning, yield formation and NUE in rice systems. Here, we highlight the dual benefits of IJHR in boosting grain production and soil quality, providing a promising pathway for reconciling food security and sustainability.

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