柚木人工林疏伐试验研究

对闽南山地柚木人工林开展不同强度疏伐试验，结果表明，在Ⅲ类立地和初植密度1335株，hm2的条件下，7．5a生左右时即可开始进行疏伐；在疏伐强度10％-40％范围内，随着疏伐强度的加大，林分生长量、土壤肥力、光合作用强度等也趋于提高。根据生产实际，若以年均树高生长量达1．3m、胸径达1．5cm以上为目标，并结合生态效益，则适宜的首次疏伐强度为20％～40％，保留密度为750～1000株/hm2。

Experimental Study on Thinning in Teak Plantation

By the experiment of thinning with different levels in teak plantation in Fujian southern moun- tains , the results showed that： under the site grade Ⅲ and initial planting density was 1 335 trees per hectare, 7.5 a teaks may commence the thinning. Within appropriate scopes, thinning the forest will not only significantly improve the light environment and photosynthesis, promoting tree growth, but also to improve soil fertility somehow. In the thinning intensity from 10% to 40%, the amount of stand growth, soil fertility and photosynthetic rate all tended to go up with the thinning intensity increased. With the average annual tree height of teaks up to 1.3 m and diameter 1.Scm as standards, the first thinning intensity was 20 %-40 % and retaining density was 750~1000 trees per hectare fit the pro- ductive goal and is eco-efficient.