用林分生长模型更新松树小班平均胸径和树高因子研究

Study on Updating the Average DBH and Height Indices of Pine Tree Stands with Stand Growth Model

为在一定程度上减少森林资源规划设计调查中的外业工作量,用新疆阿尔泰山国有林管理局森林资源连续清查中的松类样地数据1 142个,建立平均胸径和平均树高林分生长模型,给出用该地区上期森林资源规划设计调查数据的平均胸径和平均树高更新本期调查数据的方法,并通过现地调查的39个小班,采用成对T检验对试验结果进行精度验证。结果显示:平均胸径和平均树高的预测平均相对误差为0.79%,相对总误差为0.16%和8.43%,预测精度分别达98.33%和96.53%,说明该方法精度可靠,值得推广。

The growth model of the Pinus spp.forest stands was built with the average DBH and average height of the trees by means of applying the inventory data obtained from 1 142 fixed sample plots set for successive survey on forest resources in Altay State Forestry Managenment Brueau,Xinjiang,in order to reduce the field survey workload for forest resource planning and design.The data updating method for current survey was provided by using the average DBH and average height of the stands calculated in the former survey period of time.The precision test of the prediction experiment was conducted to verify the results by applying the survey data collected from 39 subcompartment and the paired T test.The results showed that the mean relative error of the average DBH and average height of the prediction was 0.79%,and the relative total error was 0.16% and 8.43%,and the prediction accuracy for the average DBH and average height was 98.33% and 96.53% respectively.The results indicated that the method was reliable and might be extended for application.