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一、冻拔灾害。冻拔灾害是我国东北内蒙等天然林区在人工更新作业中较普遍而严重的一种自然灾害。据吉林省临江县调查报告:“54——55年迹地更新的被害面积达1166公顷,其中落叶松93.3公顷,成活率仅10%;红松400公顷,成活率10%;胡桃125公顷,成活率24%;黄波罗263.38公顷,成活率17%”。从更新迹地类型来看,无论是荒山荒地,林
First, freeze-disaster. Freezing-out disaster is a kind of natural disasters which is more common and serious in the artificial renewal operation in the natural forest areas such as Inner Mongolia and Northeast Inner Mongolia in China. According to Linjiang County, Jilin Province, the investigation report: “54 - - 55 years of renewal of the victim area of 1166 hectares, of which 93.3 hectares of larches, the survival rate of only 10%; 400 hectares of Korean pine, survival rate of 10%; walnut 125 hectares , The survival rate of 24%; Huang Polo 263.38 hectares, the survival rate of 17% ”. From the update of the types of sites, whether it is barren hills, forests