杉木采伐迹地更新营造2.5代杉木良种试验研究

Experimental Study on Reforestation of 2.5 Generation Chinese Fir Improved Variety in Clear-cutting Forestland

杉木采伐迹地采用2.5代杉木良种更新造林、杉木萌芽更新以及新造湿地松进行对比试验,结果表明:杉木二代更新采用2.5代杉木良种造林是可行的,其速生性与适应性强,能有效提高林地生产力,在中等立地条件和一般经营管理水平下,造林后4年可郁闭成林,其速生性远超过湿地松和杉木萌芽更新林,4年生林分平均树高、胸径和单株材积达4.96 m、8.53 cm和0.016 1 m3,比杉木萌芽林分分别提高了26.21%、24.34%和87.21%;更新营造2.5代杉木良种的经济效益较好,是萌芽杉木林的2.12倍;2.5代杉木良种的抗贫瘠能力相对比杉木萌芽林强,相对受立地条件的影响程度小。选用2.5代杉木良种造林可以克服立地差而产量低的不足,对采伐迹地采用杉木新的良种更新造林是可行的,可进一步推广应用。

In the Chinese fir clear felling,reforestation of the 2.5 generation Chinese fir improved variety were conducted,Chinese fir sprout regeneration and Pinuselliottii were compared, and the resuits showed that：The Chinese fir cuttinghlank reforestation using the 2.5 generation Chinese fir seed planting is feasible, it grows fast, and has strong adaptability, and it can effectively improve the productivity of forest land.In the secondary site and genera] management level,4 years after planting can be forest,its speed is far more than the slash pine and Chinese fir sprout forest,the 4-year-old stand average tree height, DBH and individual volume were 4.96 m, 8.53 cm and 0.016 1 m^3 respectively, compared with Chinese fir sprout stand were increased by 26.21% ,24.34% and 87.21% ;The 2.5 generation Chinese fir seed update to create good economic benefit,is 2.12 times than that of Chinese fir sprout forest ;The 2.5 generation Chinese fir seed anti barren ability is relatively stronger than that of Chinese fir sprout forest, relatively less influence of site conditlons.The 2.5 generation Chinese fir seed planting can overcome the poor site condition rather than low yield.To cutting blank, the new fine varieties of Chinese fir reforestation is feasible, it can be further applied.