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塞罕坝 196 0～ 1980年同一等级降水量呈现隔年的规律 ,由于森林环境的逐渐形成 ,1981～ 2 0 0 0年同一等级降水主要呈现连年规律 ,提出了降水与造林成活率的关系。通过对年降水量的分析 ,揭示了不同时空降水的比重和不平衡性 ;4～ 5月份降水 5 0mm ,可作为造林成活的基本指标 ,6月份的降水连续起着重要作用 ,7～ 9月降水比重占 6 0 77%。年降水天数至少增加 2 3d。根据降水规律和对应于造林成活率的分析 ,结合实践经验 ,提出了 3项有利于造林和成活的措施建议
Due to the gradual formation of forest environment, precipitation of the same grade between 1981 and 2000 mainly showed a series of regular patterns, suggesting the relationship between precipitation and the survival rate of afforestation. According to the analysis of annual precipitation, the proportion and imbalance of precipitation in different time and space are revealed. The precipitation of 500 mm in April and May can be used as the basic index of afforestation survival. Precipitation in June plays an important role in succession. From July to September The proportion of precipitation accounted for 6 0 77%. The number of annual precipitation increases by at least 2 3d. According to the precipitation law and the corresponding afforestation survival rate analysis, combined with practical experience, put forward 3 measures in favor of afforestation and survival measures