林地质量评价是林地管理的重要内容,以重庆市城口县作为评价样本,以城口县森林资源规划设计调查数据为基础,选择分布比较广泛的马尾松作为标准树种,在计算马尾松小班的立地指数的基础上,回归计算所有林地小班立地指数,作为所有林地小班的地力指数,以小班单位面积蓄积量作为生产力指数,小班的交通距离作为区位指数,综合计算各林地小班的林地质量得分,从而对所有林地小班的林地质量进行分等定级,完成城口县的林地质量评价。评价结果城口县林地质量等级分为5级,其中一等地面积占5.5%,二等地面积占40.1%,三等地面积占39.1%,四等地面积占13.6%,五等地面积占1.7%。以此可以制定城口县的林地差别化管理政策,实行与城口县林地质量等级相对应的森林经营模式和利用方式。

Forest land quality assessment is an important aspect of forest land management.Chengkou county of Chongqing was taken as the assessment sample in this paper.Based on the forest management planning and design inventory data in Chengkou county,Masson Pine which was distributed more widely was selected as standard species.Masson Pine subcompartment site indexes were calculated.All forest land subcompartment site indexes were calculated by regression.All forest land subcompartment site indexes were treated as fertility indexes.Estimation per unit area in all forest land subcomparments were treated as productivity indexes.Traffic from all subcompartments was treated as regional indexes.All forest land subcompartment quality scores were calculated comprehensively according to fertility score,score of estimation per unit area and traffic location score.Thus forest land quality of all subcompartments was classificatied,and forest land quality assessment in Chengkou county was completed.Forest land quality in Chengkou county was divided into five quality grades,includingfirst-class area accounted for 5.5%,the second-class area accounted for 40.1%,third-class accounted for 39.1%,fourth-class area accounted for 13.6%,fifth-class area accounted for 1.7%.Thus differentiated forest land management policies were made in Chengkou county,and forest management and utilization ways relative to forest land quality grades will be implemented.