海南岛林下灌木层和草本层生物量估测方法的研究

Study on Hainan understory shrub layer and herb layer biomass estimation methods

该研究通过在海南岛建立140个不同森林类型的样地,分别调查乔木层、灌木层和草本层的生物量,使用线性函数、对数函数、多项式函数、幂函数、指数函数5种函数来研究灌木层与乔木层生物量、草本层与乔木层生物量的关系。结果表明:灌木层与乔木层生物量的最适模型为多项式模型:Y=5.4457-0.0264*X+0.00005*X*X(R2=0.437);草本层与乔木层生物量相关性较小,5种模型的相关系数均小于0.1,海南林下草本层的生物量的估算可以使用其平均数参数0.45t/hm2。

The study bases on biomass survey data of tree layer, shrub layer and herb layer from 140 different forest types, using 5 kinds of functions, such as linear function, logarithmic function, polynomial function, power function and exponential function to study the relationship between shrub and tree layer biomass, herbaceous layer and arbor layer biomass. The results show that the optimal model of shrub layer and tree layer biomass is polynomial model： Y=5.4457-0.0264＊X＋0.00005＊X＊X（R2=0.437）;Herb layer and tree layer have less biomass correlation, and correlation coefficients of five kinds of models are all less than 0.1. The biomass estimation of Hainan herbaceous layer under forest can use their average parameters 0.45t/hm2.