论文部分内容阅读
为了研究湿地松、火炬松高密度超短轮伐期定向培育技术 ,于 1993～ 1998年在湖南汨罗市桃林场进行试验 .按正交试验设计 ,设 13个试验小区 ,小区面积为 2 0 m× 2 0 m.3个主要试验因子是 :树种类型 (湿地松 ,火炬松 ,湿地松 +火炬松等量混植 ) ,整地方式 (直接造林 ,5 0 cm× 5 0 cm× 5 0 cm中穴造林 ,撩 60 cm× 60 cm× 60 cm壕沟造林 ) ,造林密度 (初植密度分别为 ,2 2 2株 /667m2 ,2 96株 /667m2 ,444株 /667m2 ,每穴植 2株 ) .对树高、胸径进行每木调查 ,材积按 V湿 =0 .0 0 0 0 475 15× D1 .975 87× H0 .96 5 34 7,V火 =0 .0 0 0 0 63 72× D1 .930 2 × H0 .834 3两公式计算 .用广义方差分析法分析不同树种、不同造林密度、不同整地方式对树高、胸径、材积生长的影响 .分析结果表明 ,选择条件良好的立地 ,以 5 0 cm× 5 0 cm× 5 0 cm中穴造林 ,造林密度 3 82 5～ 492 0株 /hm2 ,以 10 a为轮伐期 ,可获超短期轮伐期的纤维用材 ,并可取得较好的经济效益 .
In order to study the high-density and ultra-short rotation orientation cultivation of Pinus elliottii and Pinus taeda, the experiment was conducted at the Peachuolin Farm, Miluo City, Hunan Province from 1993 to 1998. According to the orthogonal design, 13 pilot plots with a plot area of 20 m × 2 0 m.3 The main test factors are tree species (Pinus elliottii, Pinus taeda, Pinus elliottii and Pinus taeda), land preparation (direct afforestation, 50 cm × 500 cm × 500 cm) Afforestation, 60 cm × 60 cm × 60 cm trenches afforestation), afforestation density (initial planting density, respectively, 2 2 2 plants / 667 m 2, 2 96 plants / 667 m 2, 444 plants / 667 m 2 plants per plant) Tree height and DBH were measured for each tree. The volume of product was V = 0. 0 0 0 475 15 × D1 .975 87 × H0 .96 5 34 7 V V = 0. 0 0 0 63 72 × D1 .930 2 × H0 .834 3 two formulas.Using generalized variance analysis method to analyze the effects of different tree species, different afforestation density and different site preparation methods on tree height, DBH and volume growth.The results show that the selection conditions of good site to 50 cm × 500 cm × 500 cm, afforestation density of 3 82 5 ~ 49 2 0 plants / hm 2, with 10 a as the rotation period, could obtain the short rotation period fiber Material, and can achieve better economic efficiency.