杉木林分断面积生长预估模型及其应用

Basal Area Growth Prediction of Chinese Fir Stands and Its Application

选用包含林分密度指标、年龄和立地质量指标的Ｒｉｃｈａｒｄｓ型和Ｓｃｈｕｍａｃｈｅｒ型的生长模型作为杉木断面积生长预估模型，经江西省１４个未间伐林分和３６个间伐林分数据的拟合，表明Ｒｉｃｈａｒｄｓ型优于Ｓｃｈｕｍａｃｈｅｒ型，杉木间伐林分和未间伐林分可用统一的断面积预估方程．结合实例指出在采用Ｒｉｃｈａｒｄｓ型方程时，应注意地位指数方程中参数的变化对预估结果的影响．

Richards Growth Model and Schumacher Growth Model, which include stand density index, age and site quality index, are taken as basal area growth prediction models. Based on the survey of 14 unthinned plots and 36 thinned plots of Chinese fir (Cunninghamia lanceolata ) from Jiangxi Province, the fitting results show that Richards'is better than the Schumacher's,and the Richards' basal area model can be used in both thinned and unthinned stands of Chinese fir. The detail steps of basal area prediction are given. Combining an example, we should note the impacts of parameter in site index curve on prediction results when applying Richards' basal area prediction model.