论文部分内容阅读
以第七次全国森林资源清查数据为基础,以《森林采伐作业规程》等规定为依据,采用森林收获调整数学模型等对全国18个主要优势树种(组)的龄组、面积结构进行了调整。根据调整结果,建立了森林资源合理采伐量、蓄积量与年度因子之间的关系。其中,Logistic生长模型对合理采伐量与年度因子回归精度较高,方程确定指数R2为0.985;Richard生长方程对蓄积量与年度因子回归精度较高,方程确定指数R2为0.985。调整结束后,全国森林资源蓄积稳定在300亿m3以上,合理采伐量稳定在7.5亿m3左右。
Based on the Seventh National Inventory of Forest Resources, the age group and area structure of the 18 dominant species (groups) in the country were adjusted based on the “Regulations on Forest Harvesting” and the mathematical model of forest harvest adjustment . According to the adjustment results, the relationship between the reasonable harvesting volume of forest resources, stock volume and annual factor was established. Among them, Logistic growth model had a higher accuracy of regressing the reasonable amount of cut and the annual factor, and the R2 of the equation was 0.985. The regression equation of Richard’s growth equation for the accumulative amount and the annual factor was high, and the equation of determining index R2 was 0.985. After the adjustment is completed, the national forest reserve has stabilized at more than 30 billion m3 and the reasonable harvest has stabilized at around 750 million m3.