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湖南省桃源县余田公社林场指防山分场,地处丘陵区,1971年建场以来,营造杉木、檫木林1,000余亩。他们认真落实农业“八字宪法”,根据丘陵区土层瘠薄,有机质少,保水性差,易遭干旱等特点,积极开展林肥间种。从1972年起,在幼林内间种了红花草子360亩,亩产鲜草1,865—5,229斤。杉木3年成林,平均树高2.2米,优良单株4米;檫木2年成林,平均树高3.0米,优良单株4.6米。在同样立地条件和管理下,连续三年间种草子的杉木林比未间种的杉木林,平均树高大30％,提早
Taoyuan County, Hunan Province Yutian commune forest farm refers to the anti-Hill sub-field, is located in the hilly area, built in 1971 since the construction of fir, Alnus mu forest more than 1,000 acres. They conscientiously implement the “Eight Character Constitution” of agriculture and actively carry out the inter-forestation of forest fertilizer according to the characteristics of poor soil layers, low organic matter, poor water retention and drought resistance in the hilly areas. Since 1972, we planted 360 hectares of safflower grass in young trees, yielding 1,865-5,229 kilograms of fresh grass per mu. Cunninghamia lanceolata forest three years, the average height of 2.2 meters, 4 meters fine single plant; alder 2 years forest, the average tree height of 3.0 meters, 4.6 meters of fine single plant. Under the same site conditions and management, Chinese fir plantations growing three years in a row have a mean height of 30%