陕北丘陵沟壑区不同栽植时期不同保护措施对苹果幼树成活的影响

The Influence of Different Plant Time and Protective Measures on Young Apple Tree's Living Rate in Loess Hilly and Gully Region of Northern Shaanxi

陕北黄土丘陵沟壑区，早秋１０月初抢墒带叶栽植苹果幼树，冬季覆土越冬，比晚秋、早春栽植的成活率高３２．３６％和３８．３４％，生长量大２２．２２％和５４．１６％。秋季落叶后栽植的，农膜覆盖树盘加树干缠塑料条和套向日葵杆的，成活率高，生长量大，但成本高，推广困难。

In loess hilly and gully region,the young apple tree living rate and living mass which is planted with leaves in the early autumn in order to take the advantage of the soil moisture and is covered with soil in the winter,are high 32.3%、38.34% and 22.22%、54.16% than which is planted in the late autumn and the early spring.The tree is planted after leaves falled,and the earth near the root is covered with plastic film,the trunk is twisted with plastic film or the trunk is cased with stem of the sun flower has high living rate and living mass,but its cost is high and difficult to spread.