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在我们这个地区落叶松育苗下种后,影响幼苗出土的两个主要不利因子是低温和干旱,尤其是山地育苗,圃地大部分为旱地,不能进行洒水措施。过去我们用干草和松枝叶覆盖地表,这种方法虽能起到保墒防风作用,但却大大降低了地表温度,推迟了幼苗的出土时间,幼苗出土不齐,形成缺苗断垅。1980年以后我们采用地膜覆盖进行落叶松育苗,取得了提温保墒的良好效果。
After the larch seedlings are planted in our area, the two main unfavorable factors that affect the excavated seedlings are low temperature and drought, especially in mountain nurseries. Most of the nurseries are dry land, and sprinkling can not be carried out. In the past we covered the surface with hay and pine branches, although this method can play a role of wind and soil moisture, but greatly reduced the surface temperature, postponed the excavated time of seedlings, seedlings unearthed, the formation of missing seedlings. After 1980, we used larch seedlings for plastic film mulching to achieve the good effect of warming and preserving soil moisture.