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一、丰产林形式全市125个村庄营造了杨树速生丰产林,其主要经营形式有三种:1.林粮兼顾,发展大径用材林。属于这种形式的主要是在土质肥沃,水利较好的平川地区,地下水位2—5米,人均耕地2亩以上的川地和部分丘陵区。发展较快的有吴村、乔李、县底、屯里、尧庙、段店等乡(镇)。丰产林营造规格一般为2×8米,每亩栽植42株,3年后隔株间伐小径椽材,以4×8米为过渡,每亩留21株,6年后隔株间伐中径檩材,每亩留10株,10年长成大径用材林,作为一个轮伐期。另一种规格是以3.5×4米为基础,每亩47株,3年隔株间
First, the form of high-yield forest 125 cities in the city to create a poplar fast-growing and high-yield forest, the main business there are three forms: 1. Both forest and grain, the development of large-diameter timber forest. Belongs to this form is mainly in the fertile soil, water is good Hirakawa area, groundwater level 2-5 meters, per capita arable land more than 2 acres of Sichuan and part of the hilly area. Rapid development of Wu Village, Qiao Li, county, Tunliu, Yao Temple, Dian Dian and other towns (towns). High-yielding forest to create the specifications are generally 2 × 8 meters, planting 42 plants per mu, 3 years after the thinning of thinner rafters across the plant, to 4 × 8 meters for the transition, leaving 21 acres per mu, 6 years after the interval thinning diameter 檩Material, leaving 10 per acre, 10 years into large diameter timber forest, as a rotation period. Another specification is based on 3.5 × 4 meters, 47 per acre, 3 years apart