难检字字典在线查询

汉语拼音：wú shuāng qī

指一年中终霜后至初霜前的一整段时间。在这一期间内，没有霜的出现。农作物的生长期与无霜期有密切关系。无霜期愈长，生长期也愈长。无霜期的长短因地而异，一般纬度、海拔高度愈低，无霜期愈长。

1. 一年中不下霜的时期，为植物生长季节。无霜期长短，随各地气候寒暖而不同。

• Northern Alberta is mostly covered by boreal forest and has fewer frost-free days than southern Alberta due to its subarctic climate.

  北阿尔伯塔主要是涵盖寒带森林，并减少无霜期天，比艾伯塔省南部由于其亚北极气候。

• The research of the evolution principle of frost-free period would give climate resources support for risk decision making in agriculture.

  研究无霜期演变规律，为农业风险决策，趋利避害充分利用气候资源提供气候依据。

• Early frost damage reduced by 80%. Frost period variation increased the heat resources.

  霜期提前、推后、无霜期延长使农业生产的热量资源增加。

• September to May the following year as the frost period, frost-free period is short, significant differences between north and south.

  九月至次年五月为霜冻期，无霜期短，南北相差悬殊。

• Change at the annual frost-free period 100-160 days, the distribution of the trend of growing on the grounds east to west.

  全年无霜期变化在100—160天之间，分布趋势为由东向西逐渐增长。

• The frost-free period lengthened, and the frost period shortened.

  无霜期天数增加，霜期缩短。

• The striking characteristics include: cold in winter and short frostless season;

  突出的特点是冬季寒冷，无霜期短；

• Variations of Frost-Free Period and Low Temperature in Spring in Minqin Desert

  民勤荒漠区无霜期及春季低温变化特征分析