低价林早期诊断: 生态因子途径

提出了低价林早期诊断的新思路，即根据低价林的形成规律，在林分还未表现出低价林状况时就能诊断出其发展趋势，以便及时采取相应的经营管理措施，以辽西油松林为例，从生态因子途径开展了低价林的早期诊断研究，建立了基于单因素实验和判别分析的生态因子途径早期诊断技术。研究表明，土层厚度X1，有机质含量X2，土壤全氮含量X3，土壤含水率X4，土壤微生物总数量X5可选择作为油松低价林早期诊断的敏感指标；在综合诊断时引入了判别分析的数量分类方法，并根据判别分析的思路建立了油松林生长状况生态因子途径早期诊断方法，其步骤：1）确定判别指标；2）建立判别函数Y＝1．596X1－0．51X2－3．196X3＋1．622X4＋1．898X5；3）通过判别函数和研究对象的各项判别指标值进行早期诊断低价林早期诊断的技术与方法尚有待进一步地研究，检验和完善。

Early diagnosis of low-value forest: An approach of ecological factors

The management and improvement of low value forests is an important issue of forestry in China. This paper put forward a new thought of early diagnosis for low value forest. By applying this method,the forest growth trend before the explosion of the state of low value forest was diagnosed according to the formation rule of low value forest,and so,managers could adopt corresponding management measures in time. Taking a case study of Chinese pine plantations in western Liaoning Province,the early diagnosis of low value forest was studied,and set up early diagnosis techniques of ecological factor approach based on single factor experiment and discriminant analysis: 1) following discriminant indices were selected: soil thickness ( X 1 ),organic matter ( X 2 ),soil nitrogen content ( X 3 ),soil water content ( X 4 ),and soil microbic quantity ( X 5 );2)discriminant function could be expressed as: Y=1.596X 1- 0.51 X 2-3.196X 3+1.622X 4+1.898X 5 ;3)early diagnosis of low value forest was carried out by discriminant function and the value of each discriminant index. For early diagnosis of low value forest,this paper is a pilot study. It is suggested that the forming mechanism of low value forest and their related study should be strengthened.