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• W4200375103 abstract "Understanding the spatiotemporal evolution characteristics of the risk of late frost damage has scientific guiding significance for optimizing the regional agricultural production layout and varie-ty tuning. Based on the daily meteorological data of 65 weather stations in the southwest China tea region from 1971 to 2020, we analyzed variation characteristics of the last frost date (LFD), tea bud open date (BOD), and their relationships, constructed frost damage probability index and frost damage severity index of spring shoots of shrubby tea trees, and analyzed the spatiotemporal evolution chara-cteristics of the late frost damage risk of shrub tea trees in the southwest tea region. The results showed that both the BOD and LFD had a significant ahead of trend from 1971 to 2020 and the early rate of the LFD was relatively faster than that of the BOD in the southwest tea region. The number of days that the tea buds were exposed to late frost damage after germination showed an non-significant declining trend. The risk of late frost damage of shrubby tea trees in most parts of the southwest tea region showed a declining trend, but Guizhou tea planting region showed an insignificant increasing trend. The risk of late frost damage to shrubby tea trees was high in the western marginal mountai-nous areas of Sichuan tea region, and the junction of Guizhou and Yunnan tea region. The risk of late frost damage was at low level in Sichuan Basin, southern Yunnan tea region, and southern Guizhou tea region. The risk of late frost damage to shrubby tea trees in the northern and central-eastern parts of Yunnan tea region showed an obvious decreasing trend, but increased significantly in the central and eastern parts of Guizhou tea region.研究晚霜冻害危险性时空演变特征,对于优化区域农业生产布局和品种调优具有科学的指导意义。本研究利用西南茶区65个气象站点1971—2020年逐日气象数据,结合霜冻终日和茶芽萌发初日的变化特征及其相互关系,构建西南茶区灌木型茶树春梢晚霜冻害概率指数和冻害强度指数,分析西南茶区灌木型茶树晚霜冻害危险性时空演变特征。结果表明:1971—2020年,西南茶区霜冻终日和茶芽萌发初日均呈显著提前趋势,且霜冻终日的提早速率快于茶芽萌发初日的提早速率,萌发后的茶芽暴露于晚霜冻害的天数总体呈不显著下降趋势。西南茶区大部分区域灌木型茶树晚霜冻害危险性呈下降趋势,但贵州茶区呈不显著上升趋势。四川茶区西部边缘山区、贵州茶区西部与云南茶区东北部交界处等地灌木型茶树晚霜冻害危险性一直较高,四川盆地区、云南茶区南部和贵州茶区南部等地晚霜冻害危险性一直较低。云南茶区北部、中东部地区等区域晚霜冻害危险性呈明显下降趋势;而贵州茶区中部和东部区域灌木型茶树晚霜冻害危险性明显增加。." @default.
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• W4200375103 date "2021-11-15" @default.
• W4200375103 modified "2023-09-27" @default.
• W4200375103 title "Spatiotemporal evolution characteristics of the late frost damage risk to shrubby tea trees in tea region, southwest China from 1971 to 2020." @default.
• W4200375103 doi "https://doi.org/10.13287/j.1001-9332.202111.012" @default.
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