摘要
[目的]探讨蒙古栎各龄组适宜的抚育间伐方案,为吉林省蒙古栎天然次生林的抚育间伐提供依据。[方法]以5期吉林省森林资源连续清查数据为基础,筛选蒙古栎幼龄林、中龄林和近熟林,划分5级蓄积间伐强度:强度1(0~10%)、强度2(10%~20%)、强度3(20%~30%)、强度4(30%~40%)、强度5(40%~50%),对比未间伐林分,研究不同龄组林分对不同间伐强度在各观测间隔(5、10、15和20 a)的蓄积生长率的变化规律。[结果](1)伐后各时间段蓄积生长率随间伐强度增长的趋势:幼龄林先持平,再快速上升,最后快速下降;中龄林先缓慢增长,最后快速下降;近熟林,伐后5 a与10 a,先快速增长,后快速下降直至平缓,而伐后15 a与20 a,先快速增长,后平缓下降。(2)伐后各时间段峰值出现的间伐强度范围:幼龄林都在20%~35%之间,中龄林由伐后5 a和10 a的15%~35%之间至伐后15 a与20 a的20%~40%之间,近熟林由伐后5 a和10 a的15%~25%之间至伐后15 a与20 a的15%~35%之间。(3)各间伐强度级蓄积生长率均值相对于未间伐提升显著的有:幼龄林:强度3与强度4;中龄林:强度2、强度3和强度4;近熟林:强度2和强度3。(4)随着时间的推移,不同间伐强度与未间伐之间的蓄积生长率的差异越来越小。[结论]吉林省蒙古栎天然次生林,各龄组适宜的间伐强度:幼龄林为25%~35%;中龄林为20%~35%;近熟林为15%~30%。
[Objective] To discuss the suitable thinning scheme for different age groups of Quercus mongolica, and provide some reference for thinning and tending of natural secondary forest of Q. mongolica in Jilin Province.[Method] Based on the data of the 5 forest resources inventories in Jilin Province, the young, middle-aged and nearmature forests of Q. mongolica were screened and five grades of volume thinning intensity were set: intensity 1(0~10%), intensity 2(10%~20%), intensity 3(20%~30%), intensity 4(30%~40%) and intensity 5(40%~50%). By comparing the non-thinning stands, this paper studied the change rule of volume growth rate of different age groups at different thinning intensities in each observation intervals(5, 10, 15 and 20 years) after thinning. [Result](1) The variations of volume growth rate changed with thinning intensity in different periods after cutting are as follows. For young forests the growth rate was flat at first, then rose rapidly, and declined rapidly in the end;For middle-aged forests, the growth rate rose slowly at first, and then declined rapidly;For near-mature forests that 5 and 10 years after felling, the growth rate rose rapidly and was flat in the end;For the near-mature forests that 15 and 20 years after felling, the growth rate rose rapidly at first, then declined rapidly and declined slowly in the end.(2) The ranges of thinning intensity of the peak value in each period after cutting were 20% to 35% for young forest, 15% to 35% for middle-aged forest that 5 and 10 years after cutting, 20% to 40% for middle-aged forest that 15 and 20 years after cutting, 15% to 25% for near-mature forest that 5 and 10 years after cutting. 15% to 35% for near-mature forest that 15 and 20 years after cutting.(3) The mean volume growth rate of young forest with thinning intensity 3 and 4, middleaged forest with thinning intensity 2, 3, 4, near-mature forest with thinning intensity 2 and 3.(4) The difference in volume growth rate between various thinning intensities and no thinning was getting smaller over time. [Conclusion] The suitable thinning intensities for natural secondary forest of Q. mongolica in Jilin Province are medium-high intensity(30%~40%) for young forest, medium or medium-high intensity(20%~40%) for middle-aged forest, and medium intensity(20%~30%) for near-mature forest.
作者
全锋
周超凡
段光爽
胡雪凡
张会儒
雷相东
QUAN Feng;ZHOU Chao-fan;DUAN Guang-shuang;HU Xue-fan;ZHANG Hui-ru;LEI Xiang-dong(Research Institute of Forest Resources Information Techniques,Chinese Academy of Forestry,Key Laboratory of Forest Management and Growth Modeling,National Forestry and Grassland Administration,Beijing 100091,China;College of Mathematics and Statistics,Xinyang Normal University,Xinyang 464000,Henan,China)
出处
《林业科学研究》
CSCD
北大核心
2020年第2期61-68,共8页
Forest Research
基金
"十三五"国家重点研发计划课题"长白山次生林抚育更新技术研究与示范"(2017YFC0504101)
林业行业公益性科研项目"我国主要林区林地立地质量和生产力评价研究"(201504303)。
关键词
蒙古栎
抚育间伐
蓄积生长率
动态响应
龄组
强度级
Quercus mongolica
tending thinning
volume growth rate
dynamic response
age group
intensity level
