集约与粗放经营杨树人工林生长规律

应用Ｒｉｃｈａｒｄｓ生长方程，对集约经营与粗放经营杨树人工林的各项生长指标（树高，胸径、材积）与时间因子的关系进行了拟合。结合所研究林分历年来生长调查数据。经计算得出二者生长进程表入生长预测表。通过对材积生长的分析。确定了林分的数量成熟龄。研究表明：集约经营的林木生长快，成熟早，各项生长指标都明显高于粗放经营林木。数量成熟龄的１２ａ；而粗放经营林木，成熟较晚，速生期内生长量较低，数量成熟龄截止到调

Growth and Yield of Intensive and Extensive Culture Poplar Plantation

The relationship between growth factors(Height, Diameter at breast height and Volume) and the stand age were simulated by using Richards equation The growth prediction and quantitative maturity were discussed also The results showed that the trees of intensive culture plantation grew fast and matured earlier than that of extensive culture plantation that is to say, the effects of cultivation measures on the production of biomass were significant in the two plantations So, intensive culture measures accelarated the growth of plantation and made quantative maturity early, these shorten the rotation