择伐强度对湘南桉树人工林生长的影响

Effects of selective cutting intensity on the growth of Eucalyptus plantation in southern Hunan Province

以湘南桉树人工林为研究对象,探究择伐强度对湘南桉树人工林生长的影响。结果表明:择伐强度对湘南7年生"常寒一号"桉树人工林的胸径、树高和单木材积有着显著的影响,择伐强度越大,胸径、树高和单木材积连年生长量也越大,但择伐强度对树高的影响不如对胸径和单木材积的明显。在中低择伐强度下(保留密度为500~800株·hm-2),其林分蓄积的2年增加量与对照无显著差异,故采用中低强度的择伐来降低湘南桉树人工林的密度,既能提高经济效益,又能兼顾生态效益。

Taking Eucalyptus plantation in southern Hunan Province as the research object,the effect of selective cutting intensity on the growth of Eucalyptus plantation in southern Hunan Province was studied.Under elective cutting,density control treatments have significant effects on DBH,tree height and individual volume of Eucalyptus plantation"Changhan No.1"in southern Hunan Province.The larger the selective cutting intensity,the greater the DBH,tree height and individual volume of Eucalyptus plantation in succession.However,the effect of regulation treatment on tree height was not as obvious as that on DBH and individual volume.There is no significant difference between the two-year increase of the stand volume of Eucalyptus plantation and the control group under the density control at the medium and low intensity level(500~800 trees per hectare).Therefore,the density of Eucalyptus plantation in southern Hunan Province can be reduced by the medium and low intensity cutting method,which can not only improve the economic benefits,but also take into account the ecological benefits.