本文对我国近年来发生山洪灾害的特征、危害、成因、空间预报、风险度评估和防治措施等进行了分析、概括和总结，为全国山洪规划的制定提供参考。
In this paper, the characteristics, criticality, cause of formation, prediction of space, evaluation of hazard grade on mountain torrent disaster are analysed and summarized.
本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
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