数字农科院2.0

Elevated Temperature has a more Stimulating Effect than Elevated Moisture on N Mineralization and Nitrification in a Paddy Soil of Japan

文献类型： 外文期刊

作者： Tang, Shuirong;Bao, Xujiao;Meng, Lei;Xu, Xingkai;Wu, Lei;Tawaraya, Keitaro;Cheng, Weiguo

作者机构：

关键词： N mineralization;Nitrification;Rice paddy;Soil moisture;Temperature sensitivity

期刊名称： JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

ISSN： 0718-9508

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Soil nitrogen (N) mineralization and nitrification play critical roles in global N cycling. However, their responses to environmental variables (temperature and moisture) remain unexplored in paddy ecosystems. This study aimed to evaluate temperature sensitivity (Q10) of N mineralization and nitrification in paddy soil under aerobic condition and subsequent N mineralization under anaerobic condition. Paddy samples were aerobically incubated under four temperature (+/- 5, 5, 15, and 25 degrees C) and two moisture (60% and 100% water-filled pore space (WFPS)) conditions for 24 weeks. The +/- 5 degrees C was designed to simulate the diurnal variation of soil temperature between night-time (-5 degrees C, 12 h) and day-time (5 degrees C, 12 h). Subsequently, all samples underwent anaerobic incubation at 30 degrees C for 4 weeks. Aerobic and anaerobic incubations simulated the off-rice and rice growing seasons, respectively. Elevated temperature significantly reduced total N (TN) content but increased stable N isotope (delta 15N) values. Conversely, elevated soil moisture significantly increased delta 15N values but not TN content. Soil temperature significantly promoted net aerobic N mineralization and nitrification evidenced by increased mineral N and nitrate N (NO3--N) levels. The Q10 values of net aerobic N mineralization and nitrification were 0.30-3.81, and 1.08 -3.82, respectively. High moisture enhanced the Q10 values of net aerobic N mineralization and nitrification at low temperatures (+/- 5-5 degrees C), whereas low moisture promoted them at high temperatures (5-25 degrees C), likely due to moisture-stimulated freeze-thaw cycle during aerobic incubation. Anaerobic N mineralization significantly decreased with previously increased temperature during aerobic incubation, suggesting that rising temperature during off-rice season promotes N mineralization, leading to decreased N mineralization for rice production. Elevated temperature has greater propensity to stimulate N mineralization and nitrification in paddy soils than elevated moisture, establishing positive feedback loops to increased N availability and loss under global warming.

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