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| Thermal Resources Variation in Early Spring and Feasibility Analysis on Early Rice Sowing in Advance in Double Cropping System |
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| DOI：10.16768/j.issn.1004-874X.2020.09.002 |
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| Abstract: |
| 【Objective】The study was to identify the variation characteristics of early spring thermal resources and demonstrate the climate feasibility for early rice sowing in advance for the sake of higher utilization rate of climatic resources and better early rice planting mode.【Method】Based on the surface observation data from 79 meteorological stations in Jiangxi Province during 1960-2019, the temporal and spatial distribution and variation characteristics of early spring （from Mar 1st to Apr 10th） thermal resources were analyzed. According to the requirements of climate conditions for early rice sowing, the estimate methods of climate feasibility for early rice sowing in advance were built, and the feasibility of early spring thermal resources variation on early rice sowing in advance in double cropping system was analyzed.【Result】Both average temperature and effective accumulated temperature in early spring increased significantly in recent 60 years （1960-2019）, with the climatic trend rates of 0.3℃ /10a and 10.1℃·d/10a, respectively. The occurrence frequency of warm sunny days in early spring showed an increasing trend, and the occurrence frequencies of 10℃ warm sunny days and 12℃ warm sunny days in the recent 30 years （1990-2019） were 80% and 73% respectively, which increased by 11% and 9% respectively compared with those of the previous 30 years （1960-1989）. In the past 60 years, the climate was feasible for sowing with thermal shed in advance in 75% counties and for direct sowing in advance in 68% counties, and the frequency of feasible years for early sowing showed an upward trend.【Conclusion】In the past 60 years, the thermal resources in early spring showed the variation characteristics of increased average temperature and effective accumulated temperature with more frequent warm sunny days, which had feasible climate for early rice sowing in advance in double cropping system. |
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