论文部分内容阅读
奉新县甘坊采育林场于1975年在丘陵山地营造泡桐三百余亩,现平均树高11.2米,胸径17.92厘米;最大单株16.5米,胸径33.7厘米,达到成林成材。造林地海拔高450米,坡向西北,坡度20度,年平均气温为16.5℃,年平均降雨量1650毫米,年平均相对温度80—85%,绝对最低温度-11℃,绝对最高温度37℃,无霜期260天左右,属亚热带常绿阔叶林区。土壤为花岗岩风化的砂质壤土,土层深30—50m,造林前为次生林,以壳斗科植物为主,伴生杉木、毛竹、杜英、杜鹃、(?)木等。苗木系从江苏调进实生苗,主要是毛泡桐(Paulownia tamentosa(Thunb) Steu-del)和兰考泡桐(Pelougata S.H.Hu)。苗高0.8—1.5米,地径1.5—3厘米。整地时首先皆伐,然后按等线环山作带,深30厘米,带宽1.5米。1975年3月定植,
Fengxin County Ganfuse mining Yau farm in 1975 in the hills and mountains to create more than 300 acres of paulownia, the average tree height of 11.2 meters, diameter 17.92 cm; the largest single plant 16.5 meters, 33.7 cm in diameter, reaching a success. Afforestation land elevation of 450 meters, slope northwest, slope 20 degrees, the annual average temperature of 16.5 ℃, the average annual rainfall of 1650 mm, the average annual relative humidity of 80-85%, the absolute minimum temperature of -11 ℃, the absolute maximum temperature of 37 ℃ , Frost-free period of 260 days, is a subtropical evergreen broad-leaved forest. The soil is granite weathered sandy loam, which is 30-50m deep. Before afforestation, it is a secondary forest. The plants are mainly Fagaceae, accompanied by Chinese fir, Phyllostachys pubescens, Euonymus fortunei, Rhododendron mongolica and so on. Seedlings were transferred from Jiangsu into live seedlings, mainly Paulownia tamentosa (Thunb) Steu-del and Pelougata S.H.Hu. Height 0.8-1.5 meters, diameter 1.5-3 cm. The first clear-cut when all landscaped, and then by the isosine ring for the belt, 30 cm deep, bandwidth 1.5 meters. March 1975 colonization,