检查法林分生长预测及择伐模拟研究

检查法是一种适合于异龄林经营的集约作业方法，由于目前试验时间还较短（第１择伐周期１９８７－１９９２年），需要对其长期经营效果作出预测。文中提出了一种修正参数预测模型（ＭＰＰＭ）和线性规划方法相结合对于林分进行生长预测和择伐模拟研究的方法。拟合林分直径分布采用了形状灵活的Ｗｅｉｂｕｌｌ分布形式，使得这种方法很适合于异龄林分（反Ｊ形直径分布）的生长预测（当然也适于同龄林），特别是当径阶株数出现突然变化

GROWTH PREDICTIONS AND SELECTIVE CUTTING SIMULATIONS TO EXPERIMENTAL STANDS OF CONTROL METHOD

The Control Method, as an intensive management method used in uneven -aged forest, was firstly experimented in China. A method of the integration of one modified parameter prediction model (MPPM) and one linear programming method was proposed to be used for predicting and simulating standing stock growths and selective cuttings of uneven-aged stands. Because diameter distributions of stands were fitted by Weibull distribution, the MPPM was much suited to growth predictions of uneven-aged stands. Results of predictions and simulations to the experimental uneven-ages stands locoted at Wangqing Forest Enterprise of Jilin Province showed that not only stable timber harvests but also sustained standing stock growths could be gotten with 5 year selective cutting cycle and suitable selective cutting intensities in longterm selection systems. By selective cutting simulations to the five experimental stands, suitable selective:cutting intensities of them were determined and recommended.