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雁山地区物候与四季的划分
陈家庸;
广西植物研究所
摘要:
春、夏、秋、冬四季的划分,古今中外有各种不同的方法。 我国古代以立春、立夏、立秋、立冬为四季之始,二至二分为四季之中,这是以地球环绕太阳运行的轨道(即黄道)上所处的位置来确定的。气象学上把公历的三、四,五月作为春季,六、七、八月作为夏季,九、十、十一月作为秋季,十二月及翌年的一、二月作为冬季。这两种划分的方法,季节日期都是固定不变的,而各地自然条件不同,每年季节变化
关键词:  物候历  季节变化  雁山  石海椒  二至  农事活动  物候现象  菜豆树  构树  木姜子  
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