论文部分内容阅读
近年来,华北落叶松育苗在察右前旗,一直采用覆土防寒措施保护幼苗越冬。覆土防寒用工多,开支大,还易机械损伤苗木,从经济观点来看很不合算.是否不采用覆土防寒措施也能安全越冬呢?带着这个问题,先后在弓沟林场、土贵乌拉苗圃、赛汉塔拉苗圃等地进行覆土防寒越冬与裸露越冬试验,经过四年的观察,苗木死亡率差别不大,均属正常死亡系数.裸露越冬比覆土越冬的优点多.覆土越冬苗如不及时撤除防寒土,芽易在土
In recent years, Larix principis-rupprechtii nursery stock in Chaqianqianqi has been used to protect soil overwintering seedlings winter. Overburden cold work and more expenses, but also easy to mechanical damage seedlings, from an economic point of view is not cost-effective. Whether the use of overburden cold measures can also be safe for winter? With this problem, one after another in the bow ditch forest, soil Guilala nursery , Saihanlala nursery and other places for overwintering soil overwintering and naked overwintering test, after four years of observation, seedling mortality is not very different, are normal mortality factor. Bare overwintering than covered soil overwinter advantages. Timely removal of cold soil, bud easily in the soil