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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,约有面积63.5万亩,
1 PROBLEM PROBLEM In the plain lake area of our province, people will be Metasequoia, Ipomoea japonica, Taxodium distichum known as the fir, because of its fast growth, good material, good material, and water-wet and other excellent characteristics of the Lake District people welcome. 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 second five surveys of forest resources in the “June 5” Plan, the afforestation site of Artemisia saccata has reached 69.85 million, with an area of 635,000 mu,