论文部分内容阅读
黑龙江省的果树栽培历史较短,种类品种较少,主要原因是由于气候条件不良,缺乏优良的栽培品种。以哈尔滨为例,全年无霜期145—148天,1月分平均温度-20℃,历年绝对低温-39——40℃,7月分平均温度23—24℃,历年绝对高温39℃,年平均温度3℃左右,年降水量577毫米,主要集中在7、8两月。上述气候条件可以概括为冬季温度
The fruit trees in Heilongjiang Province have a short history of cultivation and few varieties, mainly due to poor weather conditions and lack of good cultivars. Taking Harbin as an example, the annual frost-free period is 145-148 days, the average temperature in January is -20 ℃, the annual absolute low temperature is between 39 ℃ and 40 ℃, the average temperature in July is 23-24 ℃, the annual absolute temperature is 39 ℃, the annual average The temperature is about 3 ℃, the annual rainfall of 577 mm, mainly concentrated in 7,8 two months. The above climatic conditions can be summarized as winter temperature