不同疏伐强度的云南松母树林结实效应  

Effects of Different Thinning Intensity on Bearing of Seed Production Stands of Pinus yunnanensis

作　　者：陈强[1] 董福美[1] 常恩福[1] 范国才[1] 尹嘉庆[1] 

机构地区：[1]云南省林业科学院,云南昆明650204

出　　处：《云南林业科技》2000年第2期1-7,共7页Yunnan Forestry Science and Technology

摘　　要：十余年来对腾冲县古永林场云南松母树林营建技术措施的试验研究表明：疏伐对林分母树树冠的生长发育具有明显的促进作用，随着疏伐强度的加大，林木树冠的增长也随之增加，而枝下高能保持相对稳定，由于结实层的增加，以及光、热、水、肥等环境条件的改善，提高了母树的结实量，从而降低了种子采集成本。在参试的几种疏伐强度中以保留郁闭度0.3处理的效果最好，其1993～1995年的每公顷年平均结实量、年平均单株结实量和结实株率分别达10 329个、60个和95.65%，超出对照25.81%、408.47％和15.37％。故对改建16年生左右的云南松天然优良林分为母树林，宜选用03（郁闭度）疏伐强度的技术措施，母树林经2次疏伐后即可定型,其疏伐间隔期不超过4年。More than 10 years of experiment on taking various techniques and measures to construct seed production stands of Pinus yunna nensis in Yonggu Forest Farm of Tengcong county shows thinning can promote growth and development of the stands crown obviously With the enhancement of thinning intensity, the growth of tree crown will increase, while subaxile heigh t can keep relatively stable Increase of bearing layers and improvement of env ironment conditions result in raise of bearing amount of mother trees The thin ning intensity of keeping 0.3 shade density has the best result From 1993 to 1995, under this density the annul average bearing yield per hectare, annul aver age bearing yield per tree and percentage of bearing trees reach 10329, 60.0 an d 95.65% respectively, which are 25.81%, 408.47% and 15.37% higher than thos e of the control So, to reconstruct natural superior Pinus yunnanensis stands of about 16 years old as seed production stands, it should take the measure of keeping 0.3 shade density The canopy of the seed production stands can be fixed after two times of thinning, and the period of thinning interval s hould be shorter than four years

关 键 词：云南松 母树林 疏伐强度 结实效应 树冠生长发育 

分 类 号：S791.257[农业科学—林木遗传育种] S722.82[农业科学—林学]