【摘要】 该文首次提出了林下植物喜湿度参数ＭＬＰ（ＭｏｉｓｔｕｒｅＬｏｖｉｎｇＰａｒａｍｅｔｅｒ），并用包括ＭＬＰ在内的１４个林分因子与松毛虫危害程度进行逐步回归分析，从中筛选出主林层郁闭度、海拔高度、油松平均胸径和林下植物喜湿度参数４个关键因子，与松毛虫危害程度之间均呈显著的负相关关系，并进一步用这４个因子与松毛虫危害程度建立多元线性回归模型，该模型可对松毛虫危害程度进行风险评估更多还原

【Abstract】 The harm extent of Dendrolimus tabulaeformis and D. spectabilis were analyzed by fourteen forest factors, from which four significant ones were selected: crown density, altitude, average diameter at breast height and MLP (Moisture Loving Parameter). MLP is a new parameter suggested in this paper. It is better than diversity index to the harm extent, and it can indicate some information on not only the under story plant species diversity but the forest environment. Using the four key factors a multiphase linear regression model was made for risk analysis of the harm extent of pine caterpillar.更多还原