西南林业大学学报
西南林業大學學報
서남임업대학학보
JOURNAL OF SOUTHWEST FORESTRY COLLEGE
2014年
5期
1-7
,共7页
李莲芳%李卫冲%郑树宏%龚建斌
李蓮芳%李衛遲%鄭樹宏%龔建斌
리련방%리위충%정수굉%공건빈
云南松%疏伐%林分密度%生长动态
雲南鬆%疏伐%林分密度%生長動態
운남송%소벌%림분밀도%생장동태
Pinus yunnanensis%thinning%forest density%growth dynamic
在滇中宜良禄丰村林场,以0、25.8%、31.5%和27.7%的株数疏伐强度对密度为7311、4933、6733株/hm2和4211株/hm2的4块30 m ×30 m林龄25年生塘状直播造林的云南松人工林样地进行首次疏伐。疏伐后1.0a和5.3a时,进行每木调查,计算林分密度、活立木生长量和枯立木数量。结果表明,疏伐有效地促进了林木生长,其中:1)疏伐1.0 a和5.3 a后,样地1~4的林分密度降低至6744、3604、4579、2989株/hm2和3856、3000、4278、2611株/hm2;2)疏伐5.3 a后,样地1~4的林分平均胸径和树高分别从疏伐前7.7、6.2、8.1、8.9 cm和6.4、5.7、8.5、8.5 m,提高至9.6、9.6、10.3、11.0 cm和9.2、9.5、10.5、12.1 m;3)对照样地的蓄积量比疏伐后的增加13.6%,而疏伐样地2~4则分别增加156.8%、49.5%和37.5%,均高于对照。对照林分的枯立木高达55.0%,疏伐林分的为8.0%~19.6%,揭示了此类林分的实际疏伐强度还可以相应地提高。
在滇中宜良祿豐村林場,以0、25.8%、31.5%和27.7%的株數疏伐彊度對密度為7311、4933、6733株/hm2和4211株/hm2的4塊30 m ×30 m林齡25年生塘狀直播造林的雲南鬆人工林樣地進行首次疏伐。疏伐後1.0a和5.3a時,進行每木調查,計算林分密度、活立木生長量和枯立木數量。結果錶明,疏伐有效地促進瞭林木生長,其中:1)疏伐1.0 a和5.3 a後,樣地1~4的林分密度降低至6744、3604、4579、2989株/hm2和3856、3000、4278、2611株/hm2;2)疏伐5.3 a後,樣地1~4的林分平均胸徑和樹高分彆從疏伐前7.7、6.2、8.1、8.9 cm和6.4、5.7、8.5、8.5 m,提高至9.6、9.6、10.3、11.0 cm和9.2、9.5、10.5、12.1 m;3)對照樣地的蓄積量比疏伐後的增加13.6%,而疏伐樣地2~4則分彆增加156.8%、49.5%和37.5%,均高于對照。對照林分的枯立木高達55.0%,疏伐林分的為8.0%~19.6%,揭示瞭此類林分的實際疏伐彊度還可以相應地提高。
재전중의량록봉촌림장,이0、25.8%、31.5%화27.7%적주수소벌강도대밀도위7311、4933、6733주/hm2화4211주/hm2적4괴30 m ×30 m림령25년생당상직파조림적운남송인공림양지진행수차소벌。소벌후1.0a화5.3a시,진행매목조사,계산림분밀도、활립목생장량화고립목수량。결과표명,소벌유효지촉진료림목생장,기중:1)소벌1.0 a화5.3 a후,양지1~4적림분밀도강저지6744、3604、4579、2989주/hm2화3856、3000、4278、2611주/hm2;2)소벌5.3 a후,양지1~4적림분평균흉경화수고분별종소벌전7.7、6.2、8.1、8.9 cm화6.4、5.7、8.5、8.5 m,제고지9.6、9.6、10.3、11.0 cm화9.2、9.5、10.5、12.1 m;3)대조양지적축적량비소벌후적증가13.6%,이소벌양지2~4칙분별증가156.8%、49.5%화37.5%,균고우대조。대조림분적고립목고체55.0%,소벌림분적위8.0%~19.6%,게시료차류림분적실제소벌강도환가이상응지제고。
In Lufengcun Forestry Centre of Yiliang County,the Centre of Yunnan,in a 25-year-old Pinus yun-nanensis plantation which regenerated by seeds directly sowed at a small spot of site preparation,the first thinning was implemented in four 30 m ×30 m sampling plots based 0.0%,25.8%,3 1.5%and 27.7%thinning intensity on densities of 7 311,4 933,6 733 and 4 211 tree/hm2. After 1.0-and 5.3-year of the forest thinned,tally was carried out,and forest densities,tree growth,dead standing trees were calculated. The results showed that the thinning effectively facilitated forest growth.Firstly,after 1.0- and 5.3-year of forest thinned,stands densities of 1 -4 sampling plots were declined to 6 744、3 604、4 579、2 989 and 3 856,3 000,4 278,2 611 tree/hm2,re-spectively. Secondly,after 5.3-year of stand thinned,mean diameters at breast height (DBH)and tree heights for 1 -4 sampling plots were increased to 9.6,9.6,10.3,11.0 cm and 9.2,9.5,10.5,12.1 m from which of 7.7,6.2,8.1,8.9 cm and 6.4,5.7,8.5,8.5 m,respectively,before stands thinned.Thirdly,compared to thinned stands,there was 13.6% increment of timber volume in the control sampling plot,while which were 156.8%,49.5% and 37.5% in 2 -4 thinned sampling plots,respectively,in terms of timber volume incre-ments of thinned stands overwhelmingly higher than which of unthinned stand.In 0.0%thinned forest,there was 55.0% dead standing trees,while in thinned forests,the valvue was 8.0%-19.6%.The results implied that practical thinned intensities could be properly increased in this kind of P.yunnanensis forest.