Classification And Quality Evaluation Of Forestsites Based On Continuous Forest Inventory Data System In Zhejiang

As national important natural resources and strategic resource, forestland is the foundation for forest’s survival and development. Site classification and quality assessment plays an important guiding role in scientific afforestation and management in the way of matching species with the site. It also has important practical significance in scientific management of forest resources, as well as promotion of ecological civilization and construction of beautiful China.Based on continuous forest inventory system in Zhejiang Province, the thesis explores the site classification and quality assessment in the province by using survey data of fixed site factors and continuous measured data of tree growth. It includes the main contents as follows:(1) According to differences in site dominate factors of forestland on mountains and hills as well as plains, the thesis adopts stepwise regression analysis as well as qualitative and quantitative analysis method to select dominate factors in site classification,and then build site classification system in Zhejiang Province. The forestland in Zhejiang is divided into 2 site regions,9 site sections,20 site type groups and 52 site types.(2) According to the site classification system established, each site unit is given a quantitative score respectively and site quality of each is evaluated to build a site quality evaluation system, with Quantitative Method I and AHP. The whole forestland in the province is divided into 262 units, including five quality levels, namely the first-class site, second-class, third-class, fourth-class and fifth-class.(3) Based on the replacement inventory data of fixed sample plots of forest resources in Zhejiang Province in 2012, site quality of the forestland in the province is evaluated with a site quality map made, by using the site classification and quality assessment system as well as systematic sampling statistical and geostatistical Kriging interpolation methods.(4) Based on the continuous forest inventory (CFI) data, biomass of trees and sample plots, and biomass average annual growth data in the interval period are collected by using allometry model method. Thereupon, a site quantification evaluation model is established between site factors and biomass growth.