一、油桐林的分布情况 永顺县位于湖南西北部,地处东经109°35′～110°23′,北纬28°42′～29°27′之间。总面积3810平方公里。全县有油桐林31.6万亩,占总土地面积的5.5％,每人平均0.9亩。主要分布在海拔300至700米的山地上。其中砂页岩地区22.0万亩,占油桐林面积的70％;碳酸岩地区7.8万亩,占24.4％;其他地区仅有1.8万亩,占5.6％。油桐林地水土流失面积29.32万亩,占油桐林地总面积的92.7％(见表1)。 表1.油桐林地水土流失面积统计表 单位:亩 First, the distribution of tung oil forest Yongshun County is located in northwestern Hunan, located east longitude 109 ° 35 ’~ 110 ° 23’, latitude 28 ° 42 ’~ 29 ° 27’ between. The total area of ​​3810 square kilometers. The county has 316000 acres of tung oil forest, accounting for 5.5% of the total land area, an average of 0.9 acres per person. Mainly located in the mountains of 300 to 700 meters above sea level. Among them, 220,000 mu of sand shale area accounts for 70% of the area of ​​tung oil tree; 78,000 mu of carbonate rock area accounts for 24.4%; other areas only have 18,000 mu, accounting for 5.6%. Oil tar soil area of ​​29.32 million mu of soil erosion, accounting for 92.7% of the total area of ​​tung woodland (see Table 1). Table 1. Statistical Tables of Soil Erosion Area in Forest of Tulip Tree Unit: mu