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1 问题的提出在我省平原湖区,人们将水杉、池杉、、落羽杉统称为三杉,由于其生长快,成材早,材质好,而且耐水湿等优良特性而受到湖区人民的欢迎。自六十年代引种至今,在我省平原湖区已经广泛栽培,成为农田防护林带、林网及防浪护岸林的主要树种。据“六五”森林资源二类调查统计,湖区用三杉造林已达6985万株,面极约63.5万异,蓄积72.5万立方米,其中水杉占95％以上。虽然三杉在湖区栽培广泛,品质良好,前景广阔,但作为有关三杉调查、研究所必需的重要数表——材积表,却一直套用异地杉木材积表(湖区杉木林很少,没有本地杉木材积
1 PROBLEM PROBLEMS In the plain lake area of our province, people refer to Metasequoia, Iyama, and Taxodiums as Artemisia fir, which are welcomed by the people of Lake District due to their good growth, early harvest, good material, and good wetting resistance. Since its introduction in the 1960s, it has been widely cultivated in the plains and lake areas of our province and has become the main tree species of farmland shelter belts, forest nets and anti-wave shelter forests. According to the survey data of the second five categories of forest resources in the “Sixth Five-Year Plan”, the afforestation area of Artemisia saccata has reached 69.85 million with a surface area of about 635,000 and an area of 725,000 cubic meters, of which Metasequoia accounts for more than 95%. Although Sophora japonica is widely cultivated in the Lake District, its quality is good and its prospects are bright. However, as an important data sheet necessary for the survey and research of Sophora japonica, the Volume Table has been applied with different types of transcological data (there are few Chinese fir forests in the lake area,