<正>以１９９２ 年建立的宝应航运林场杨树纸浆试验林为基础，探讨了杨树无性系生物量生产的三维模拟模型。结果表明，至６ 年生时，３ 个无性系和４ 种密度间林分的生物量生产存在显著差异（α＝ ０ ．０５） ，除ＮＬ８０３５１ 外，最大的林分生物量生产均出现在密度为１ １１１ 株／ｈｍ２ 的林分中。通过对多种函数比较后得到，单株生物量生产可由渐近的ＢａｕｌｅＭｉｔｓｃｈｅｒｌｉｃｈ 函数描述；ＣｈａｍｐｍａｎＲｉｃｈａｒｄｓ 函数可用于计算ＢａｕｌｅＭｉｔｓｃｈｅｒｌｉｃｈ 函数中的渐近值。据此建立了由２ 个独立变量构成的三维函数模型，以估测ＮＬ８０３５１ 和Ｉ６９ 杨单株生物量生产，为林分生物量生产的模拟提供了一条新思路。

The biomass experimental plantation of poplar clones was established at Hangyun Forestry Farm,Jiangsu Province in 1992.Experimental treatments applied in a split plot design included four spacings and three poplar clones with three exact replications.Height and Breast Height Diameter(DBH)were measured annually,and sample trees were cut each year for biomass production measurement.There were significant differences among biomass production of the clones and also the spacings(α=0.05).Always the narrowest spacings gave the biggest amount of biomass at every clone until age six,except clone NL 80351.The asymptotic Baule Mitscherlich function was found to fit well on biomass data of single tree at every clone,although its asymptotic value changed in time.The Champman Richards function was found to be suitable for computing asymptotic values in Baule Mitscherich function.In this way,a two independent variable three diamensional function model,as a 3D response surface,was developed for modeling biomass production of single tree for clone NL 80351 and I 69 in pulpwood plantations.The single tree response surface multiplied by frequency or distribution of tree by growing space and age is a new basis for computing stand biomass production.