一年一度的植树节即将到来,随着气候的回暖,我国的植树造林活动将由南而北逐步展开。我国的植树节定在三月十二日,是适合黄河以南及长江流域各省情况的。由于我国幅员辽阔,各地适宜的植树时间很不一致。我区绝大部分地区处于北纬40°以北,每年春季植树主要集中在四月下、中旬,也就是“清明”前后才进行。春季植树具有许多优点。第一,早春气温比较低,蒸发量小,有利于保持土壤和苗木本身的水分。第二,春季植树后,随着地温的逐步提高,苗木容易先扎根、后发芽,等到苗木萌发出嫩叶时,苗根已经能够吸收土壤中的水 The annual Arbor Day is coming. With the warming of the climate, the afforestation activities in our country will be gradually started from south to north. The Arbor Day in our country is scheduled to be held on March 12 and is suitable for the provinces to the south of the Yellow River and the provinces of the Yangtze River Basin. Due to the vast territory of our country, suitable planting time is inconsistent throughout the country. The vast majority of our region is located north of latitude 40 ° north. Each year, the planting of trees mainly takes place in April and mid-April, that is, before and after the “Qingming”. Spring planting has many advantages. First, the relatively low temperature in early spring, the evaporation is small, is conducive to maintaining the soil and seedling itself moisture. Second, after planting trees in spring, with the gradual increase of ground temperature, the seedlings are easy to root and germinate. When the young leaves are sprouted, the seedling roots can absorb the water in the soil