论文部分内容阅读
在寒冬季节,每当空中雪花纷飞,大地银装素裹,“山舞银蛇原驰蜡象”的时候,人们总会欣喜地称赞道:“好呀!瑞雪兆丰年。”那末,雪对农业生产究竟有哪些好处呢? 积雪防冻害据在我国北方一些冬小麦地区测定,冬季积雪4厘米至6厘米时,冬麦地5厘米深的地温一般比无积雪的高2℃～3℃,并且积雪越深,保温用用越显著。积雪之所以有显著的保温效果,主要是由于雪花结构松
In the winter season, when the sky is full of snowflakes and the ground is filled with silver, “When the mountain dancing snakes are waxing at the wax figure”, people will always be pleased to say, “Okay, Rui Xue is a good boy.” Then the snow is right. What are the benefits of agricultural production? The snow-covering and freezing-control damage is determined in some winter wheat regions in northern China. When snow is 4 cm to 6 cm in winter, the ground temperature in winter wheat fields is generally 2°C to 3°C higher than that in snow-free areas. °C, and the deeper the snow, the more significant the use of insulation. The reason why snow has significant heat preservation effect is mainly due to the snow structure