干旱荒漠区樟子松幼苗生长规律及管理技术

樟子松种子播种后,随着幼苗的出土,主根即以较快的速度下扎,2个月后幼苗根系已深入到10 cm以下的土层,抵抗力相对增强。樟子松播种苗和移植换床苗生长表现为第一、第二年生长缓慢,第三年高生长和地径生长均迅速增加,进入速生期。苗木抚育管理中,春、夏季樟子松生长高峰期需水需肥量大,应及时灌溉和施肥,秋季苗木生长变缓,应适当控水控肥,以促进苗木木质化。幼苗越冬管理中的方法为土地冻结前灌溉、覆沙、覆土,笠年春季一般到4月中旬气温稳定时除去覆土。

A research on seedling growth regulation and management of Pinus sylvestris var. mongolica in arid desert area

After seed sowing of Pinus sylvestris var. mongolica, the root system is grown 10 cm deep to soil in two month. The drought resistance is improved. The growth of sowing seedlings (1～3 a) and transplant nursery seedlings (4～6 a) shows that the first and second year is slowly, the third year begins growth fast and go into fast growth period. The pink growing period of nursery seedlings needs more nutrition and water in spring and summer but little in autumn. Seedlings need to be watered before soil freezing and covered by soil or other materials so that the survive ratio can be increased remarkably.