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横山水库建成于1969年。在毛主席无产阶级革命路线指引下,在上级党委的正确领导下,我们坚持以阶级斗争为纲,开展农业学大寨,大搞库区绿化造林运动,自1970年以来共营造杉木林1627.2亩,占造林面积的22.65％。由于加强了杉木抚育管理,杉木生长很快,到1975年已提早成林,目前一般生长良好。但是,在抚育管理过程中,发现由于杉木密度大,生长快,林分郁闭度大,造成林木养分供应不足,通风透光不良,环境卫生不好,大大影响了林木的生长发育。据山湾200亩试验地调查,立地条件一般的林分,杉木郁闭后第一年高生长就不再上升,第二年开始下降,病虫害第一年有所增加,第二年比较严重（表1）。
Hengshan Reservoir was built in 1969. Guided by Chairman Mao’s proletarian revolutionary line and under the correct leadership of the Party committees at the higher levels, we insisted on taking class struggle as the key link, carrying out Dazhai Studies in Agriculture and vigorously promoting afforestation in the reservoir area. Since the 1970s, we have built 1627.2 mu of fir forest , Accounting for 22.65% of afforestation area. Cunninghamia lanceolata grew very fast due to the fir firing management. Early in 1975, the fir forest has become an afforestation site and the current general growth is good. However, in the process of tending and management, it was found that due to the large density and fast growth of fir, the forest canopy density is large, resulting in inadequate supply of forest nutrients, poor ventilation and light, and poor sanitation, greatly affecting the growth and development of trees. According to the investigation of 200 mu experimental site in Shanwan, the stand of general site conditions did not increase in the first year after the cedar closed. The second year began to decline. The number of pests and diseases increased in the first year and the second year was more serious Table 1).