桐棉松高脂高材林抚育试验研究

选择1991-1993年自然飞子成林的桐棉松林进行人工抚育试验。试验设试验林和对照林。试验林面积62．hm2，对照林面积56．hm2，对照林的起源、林龄、单位面积保存株数、立地条件与试验林基本一致。试验林于1994-1995年进行人工补植，于幼林期每年割草、砍灌、施肥2次，并进行1次透光伐，待林分进入割脂期后，再进行1次林下除草、砍灌，改善生长条件，促进林木快速生长。对照林于幼林期不补植，每年只进行1次除草、砍灌、施肥和透光伐，待林分进入割脂期后，也进行1次林下除草、砍灌外，就不再进行其他抚育措施。20年生时，试验林保存率达到90％以上，林木胸径生长年均超过1cm/a ，树高生长达到08．6～08．9m/a ，蓄积量82．m3/hm2· a ，松脂产量达到每株57．kg ，全年9280kg/hm2；而对照林胸径年生长07．～08．6cm/a（比试验林少03．8～04．8cm/a），树高年生长05．2～07．8m/a（比试验林少18．～29．m/a），蓄积量6．3m3/hm2· a ，松脂产量每株4．5kg ，全年7601 kg/hm2。试验林的林木生长明显优于对照林的林木生长。

Tending Study on High Fat and High Timber Forest of Tongmian Pine

Artificial tending trial was conducted on Tongmian pine forests that were formed through natural fly sub forest from 1991 to 1993 .The areas of experimental forest and control forest are 6 2. hm2 and 5 6. hm2 ,respectively .The conditions of both control and experimental forests are ba-sically identical ,including the origin of forest ,forest age ,the number of preserved trees per unit are-a ,soil conditions and so on .The artificial repair planting was performed in experimental forest from 1994 to 1995 .During young growth period ,mowing ,cut irrigation and fertilization were conducted twice a year ,and release cutting once a year .When the forest enters the period of fat cutting ,another weeding and cut irrigation were performed to improve the conditions for rapid growth of trees .On the contrary ,no artificial repair planting was performed in control forest ,while mowing ,cut irrigation and fertilization were done only once a year .When control forest entered the period of fat cutting , weeding and cut irrigation were also performed but there was no other tending .At 20-year age ,exper-imental forest had preservation rate over 90% ,with the average annual grow th of diameter at breast height more than 1 cm/a ,height grow th of 0 8.6 - 0 8.9 m/a ,the volume of 8 2. m3/hm2 · a ,oleores-in production of 5 .7 kg per plant and annual oleoresin production of 9280 kg/hm2 ,w hereas control forest showed average annual grow th of diameter at breast height of 0 7. - 0 8.6 cm/a （0 3.8 - 0 4.8 cm/a smaller than that of experimental forest ） ,height grow th of 0 5.2 - 0 7.8 m/a （1 8. - 2 9. m/a smaller than that of experimental forest ） ,the volume of 6 3. m3/hm2 · a ,oleoresin production of 4 5. kg per plant and annual oleoresin production of 7601 kg/hm2 .The results demonstrate that Tongmian pine grow th of experimental forest was significantly better than that of control forest .