日本落叶松退耕幼林生长模型的研究

Study on Growth Model of Returned Young Forest of Larix kaempferi from Agriculture

2007年6月,在甘肃小陇山林业局麦积山景区内的退耕还林地上对所栽植的日本落叶松林采取标准调查法,共设置了667 m2大的标准地8块,对标准地内树木进行每木调查,并做解析木.选用直线回归方程y=a+bx预估各龄阶样木带皮胸径生长过程;用二次抛物线方程y=a+bx+cx2预估各龄阶样木树高生长进程,用幂函数y=axb预估林木材积,并对林分蓄积量进行预测.结果认为研究的日本落叶松幼林生长、发育良好,生长速度快,达到了速生丰产指标.

The standard method was adopted to survey planted Larix kaempferi in returned plots in scenic spot of Maijishan in Gansu in June of 2007. Totally 8 pieces of standard plot of 667 m^2 had been set up. Individual timber in the plot had been conducted inventory. Linear regressive equation as y = a ＋ bx was chosen to pre-estimate the growth process of breast diameter with skin in all ages, and parabolic equation y = a ＋ bx ＋ cx^2 to pre- estimate progress of height growth, power function y = ax^b to pre- estimate timber volume as well as stand stock volume. The conclusion concerned that the young forest of Larix kaempferi in the study were good in growth with fast speed, and met the requirement for fast-growing and high-yielding index.