一、前言杉木是我国特有树种,也是福建主要速生树种之一。闽江流域二十几个县是本省杉木的主要产区。为评定杉木生长条件,提供森林调查及经营过程中区别不同立地条件,采取不同经营措施和估算木材产量的依据,需要编制一种能表达立地条件优劣的数表。一九五八年景熙明、王笃治两同志在福建杉木主要产区搜集 I. Introduction Cunninghamia lanceolata is endemic to China and one of the major fast-growing tree species in Fujian. More than 20 counties in Minjiang River Basin are the main producing areas of this province. In order to assess the growth conditions of Chinese fir, provide a basis for distinguishing different site conditions during forest investigation and management, and adopting different management measures and estimating the output of wood, it is necessary to compile a number table which can express the advantages and disadvantages of site conditions. In 1958 Jing Xi Ming, Wang Duzhi two comrades collected in the main producing areas of Fujian fir