Chinese Journal OF Rice Science >
Characteristics of Spatiotemporal Evolution of Thermal Resources in Ratoon Rice at Heading and Grain-filling Stages in Sichuan Basin in 1981−2022
Received date: 2024-06-24
Revised date: 2024-09-29
Online published: 2025-11-19
【Objective】 This study investigates the dynamic changes of thermal resources during the heading and grain-filling stages of ratoon rice in the Sichuan Basin under climate change, aiming to provide a scientific reference for ensuring the safe production of ratoon rice in the region. 【Method】 Using daily mean temperature data from meteorological stations and observational data on the maturity stage of main-crop rice from agrometeorological stations within the ratoon rice planting area of the Sichuan Basin from 1981 to 2022, we analyzed the spatiotemporal evolution characteristics of thermal resources, the safe full-heading date (SFHD), and the grain-filling termination date (GFTD). 【Result】 The results show that both the SFHD and GFTD of ratoon rice exhibited a significant delaying trend from 1981 to 2022, with climate tendency rates of 1.58 d·(10a)⁻¹ and 2.0 d·(10a)⁻¹, respectively. The dates with 80% climatic guarantee probability ranged from September 10-17 for SFHD and October 15-28 for GFTD. The spatial distributions of SFHD and GFTD were similar, showing a progressive delay from the northwest to the southeast of the basin. Thermal resources during the heading and grain-filling stages showed a significant increasing trend, with growing degree days (GDD) generally ranging between 100 and 300 ℃·d and a climate tendency rate of 9.72 ℃·d·(10a)⁻¹. Spatially, GDD increased from the northwest to the southeast of the basin. From the 2010s onward, the area with GDD above 200 ℃·d expanded significantly toward the northwest, increasing by more than 10,000 km² compared to that in the 1980s. Since the 2000s, the interdecadal durations of both SFHD and GFTD have lengthened overall, while fluctuations in thermal resources during these stages have intensified. 【Conclusion】 Under climate change, the heading and grain-filling stages of ratoon rice in the Sichuan Basin are characterized by more abundant thermal resources, which is conducive to expanding the cultivation area and promoting diversified planting patterns. However, the increasing impact of extreme high- and low-temperature events on the stability of thermal resources has become an unfavorable climatic factor for ratoon rice production.
Key words： ratoon rice; heading and grain-filling; thermal resources; Sichuan Basin
LUO Zizi, ZHANG Dejun, CHEN Dongdong, BI Miao, ZHU Yuhan, HAN Xu, WU Qiang, LI Yuechen . Characteristics of Spatiotemporal Evolution of Thermal Resources in Ratoon Rice at Heading and Grain-filling Stages in Sichuan Basin in 1981−2022[J]. Chinese Journal OF Rice Science, 2025 , 39(6) : 873 -886 . DOI: 10.16819/j.1001-7216.2025.240614
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