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吉林临江林业局,自1959年采用保土防冻法更新造林以来,成活率由过去的70%以下提高到85%以上,为本区采伐迹地更新造林创造了极其有利的条件。一、本区更新造林冻拔的原因:在地势平坦,排水不良的或水湿地的迹地上,更新造林时,由于整地而破坏了腐殖质和土壤结构,致使穴面低陷容易积水。当春季解冻初期,土表含水量80%以上地方,白天温度上升到10℃以上,土壤解冻而略下降,夜间温
Linjiang Forestry Bureau of Jilin Province has improved its afforestation rate from the level below 70% to over 85% since 1959 when using afforestation and frostbite method, which has created extremely favorable conditions for reforestation of deforestation in this area. I. Reasons for updating afforestation in this area: On the flat land, poorly drained or water wet land, when the reforestation is renewed, humus and soil structure are damaged due to land preparation, resulting in the depression of the hole surface and easy accumulation of water. When the early spring thaw, soil moisture content above 80%, the daytime temperature rose to above 10 ℃, the soil thawed and declined slightly, night temperature