Reforestation options. Should choose low hills or low and medium sized mountains, the slope is less than 30 degrees, the slope direction is east, southeast, southwest direction, the soil layer is deep (not less than 50 cm), drainage, good ventilation, medium fertility, pH 4.5 ~6.5. Harvested land shall be cleared of cuttings and miscellaneous irrigation.
Site digging. Studies have shown that when the site conditions above the 14-index level in the suitable habitat of Pinus elliottii create a high-yielding forest of Pinus elliottii, it is the most economical afforestation site preparation method after directly cleaning the forest land and directly digging holes (not requiring full planting). This will not only save labor costs and land preparation costs, but also ensure rapid forest production and high yields. The specification of the hole depends on the site index. Under the condition of neutral ground (site index is 14 and 16), the specification of the hole is: Zhongxue (50cm, 50cm, 40cm); and high site (site index is 18 or more). Next, the specification of the hole is: Small hole (40 cm, 40 cm, 30 cm). Afforestation plant spacing should be a rectangular configuration (wide line narrow plant).
Shi Ji Fei. In the new site of afforestation, the amount of base fertilizer and its amount is: 1.0 kg of special fertilizer/hole; on the high site, base fertilizer may not be used. Fertilization method is to put the fertilizer into the hole, fill in the topsoil to half the depth of the hole, mix the topsoil and the fertilizer, and then fill the topsoil.
afforestation. The selection of fine families of Pinus elliottii afforestation has a volume gain of more than 40%. Afforestation with Class I and II seedlings is strictly prohibited, and afforestation with Class III seedlings is strictly prohibited. Afforestation with bare root seedlings is generally carried out in the early spring before the spring shoot is germinated. In order to increase the survival rate, afforestation should be conducted before and after the rain, and the afforestation should be cloudy or sunny. For seedlings transported on a long-distance basis, the roots of the seedlings should be immersed in an aqueous solution of ABT2 rooting powder at a concentration of 80 parts per million for 15 minutes before planting. The planting depth should be appropriate and it should not be planted too shallow. Cultivated and practical is the key to improving the survival rate of planting. The method is: firstly dig a small hole above the filling hole of the planting hole, the depth is about 15 cm, put the root system of the pine seedling into the hole, compress it with a small amount of fine soil, and then slightly Raise the saplings and let Miao Zhenggen fill it with about 2/3 of the soil and then squeeze it tightly. Fill the soil with 1/3 of the soil and then squeeze the soil. Then cover it with a layer of soil.
Initial planting density. The suitable initial planting density should be determined according to the different characteristics of the excellent family of S. elliottii. For example, the family II-101# is better than 0-1027# and 0-187#. At the same time, appropriate operating density should be determined based on the business objectives and operating levels. For example, when operating the short-rotation fiber plantation of Pinus elliottii, the initial planting density will be 86-93 plants/plant under the condition of neutral forest and no forest cutting. Acre; in the case of thinning once, the initial planting density should be 106 to 113 plants/mu; under high site conditions, wetland pine plantation should be 100 to 106 plants/mu, requiring one thinning. When cultivating large-diameter materials (plywood), they should be carried out under high site conditions. The initial planting density should be: 106-133 spores per mu, requiring secondary thinning. When wetland pine is used to create ecological forests, common improved varieties should be used. The initial planting density is generally 100 to 106 plants/mu, and no thinning is required.
Timely top dressing. Using the “appropriate local and timely fertilization†technology, the forest stands were fertilized and cultivated. Under medium site conditions, the topdressing time, fertilizer type and amount were: 0.5 kg/plant for special fertilizer at 4 years of age and 1.0 kg/plant for special fertilizer at 9 years of age. Under the conditions of higher sites, the special fertilizer 1.0 kg/plant will be used for the 4-7 years of life, the special fertilizer 1.0 kg/plant for the 9-11 years, and the special fertilizer 2.0 kg/plant for the 5 years before the construction cutting.
For the existing forest on the neutral ground, the special fertilizer 2.0 kg/plant will be applied for 4 to 7 years, and the special fertilizer 1.0 kg/plant will be applied for the 9 to 11-year life (when large-diameter timber is applied for 14 years or 5 years before the main cutting Fertilizer 2.0 kg/plant); For the existing forest on the high site, top dressing, when 4 to 7 years old, special fertilizer 1.0 kg/plant, followed by special fertilizer 2.0 kg/strain 9 to 11 years old, before the construction felling 5 years topdressing special fertilizer 2.0 kg/plant.
Normally, top dressing is applied from March to April, along the outer side of the canopy drip line (crown projection line), and a semi-circular groove is dug in the direction of the uphill of the trunk. The groove depth is 30 cm and the width is 30 cm. After evenly adding fertilizer, fill in the topsoil. After half of the depth of the ditch, mix topsoil and fertilizer, and then fill with topsoil.
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