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首页> 外文期刊>Journal of Arboriculture >Chilling and heat unit levels affect foliar budbreak of selected red and freeman maple cultivars
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Chilling and heat unit levels affect foliar budbreak of selected red and freeman maple cultivars

机译：低温和热量单位水平影响选定的红色和弗里曼枫树品种的叶片萌芽

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摘要

The effects of six levels of chilling (temp <7 deg C) on foliar budbreak of red maple (Acer rubrum) cultivars October Glory~(R) and 'Franksred' (Red Sunset~R) and Freeman maple (A. X freenlanii) cultivar 'Autumn Fantasy' were evaluated in a study conducted from December 14, 1999, to April 7, 2000. October Glory had a greater minimum chilling hour requirement to initiate budbreak than 'Autumn Fantasy' and 'Franksred' (Red Sunset). However, once optimal chilling had been satisfied (near 600 hours), October Glory required fewer heat units than the other cultivars to reach 20 percent and 25 percent budbreak. For example, estimates for heat units required to reach 25 percent budbreak for October Glory were less than half that required for 'Autumn Fantasy' and 'Franksred' following 1,200 hours of chilling. Chilling was a determining factor in foliar budbreak for all cultivars, and with all three cultivars, increasing chilling produced greater budbreak percentages and the rate at which budbreak was initiated. All cultivars required fewer heat units for budbreak as chilling increased. All cultivars required over 1,700 heat units to initiate budbreak after 200 hours of chilling, but only 780 to 970 heat units after 600 hours and between 200 and 400 following 1,000 hours of chilling. Information from this and future studies may be used to facilitate the development of models for regional planting recommendations based on the amount chilling received in a given location. Calculated r~2 values indicated the models provided a good fit to the data for all cultivars.
机译：六种水平的低温（温度<7摄氏度）对红槭（Acer rubrum）品种Oct. Glory〜（R）和'Franksred'（Red Sunset〜R）和Freeman枫（A. X freenlanii）的叶芽萌芽的影响在1999年12月14日至2000年4月7日进行的一项研究中对“秋天幻想”品种进行了评估。与“秋天幻想”和“弗兰克斯雷德”（红色日落）相比，十月荣耀具有更高的最低发芽时限。但是，一旦达到最佳冷藏效果（将近600小时），Octory Glory所需的热量单位就会比其他品种少，以达到20％和25％的芽断裂。例如，经过1200小时的冷藏后，达到10月荣耀的25％芽蕾所需的热量单位估计值不到“秋季幻想”和“弗兰克斯雷德”所需热量单位的一半。低温是所有品种叶面芽萌发的决定因素，而对于所有三个品种，低温的增加会产生更高的芽萌发百分率和芽萌发的速率。随着低温的增加，所有品种需要更少的热量来萌芽。所有品种在冷藏200小时后需要超过1,700个热量单位才能开始萌芽，但在冷藏600小时后仅需要780至970个热量单位，而冷藏1000小时后仅需要200至400个热量单位。来自此研究和未来研究的信息可用于促进基于给定位置上收到的冷藏量的区域种植建议模型的开发。计算得出的r〜2值表明该模型与所有品种的数据非常吻合。

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