抚育采伐对塞罕坝自然保护区樟子松人工林林分结构的影响  

Effects of thinning on the structure of Pinus sylvestris var.mongolica plantation in Saihanba Nature Reserve

作　　者：王晓蕊 张馨月 贾磊 许中旗[1] 张菲 付立华 程顺 WANG Xiaorui;ZHANG Xinyue;JIA Lei;XU Zhongqi;ZHANG Fei;FU Lihua;CHENG Shun(College of Forestry,Hebei Agricultural University,Baoding 071000,China;Saihanba Mechanical Forest Farm,Weichang 068450,China)

机构地区：[1]河北农业大学林学院,河北保定071000 [2]河北省塞罕坝机械林场总场,河北围场068450

出　　处：《林业与生态科学》2024年第4期357-363,共7页Forestry and Ecological Sciences

基　　金：国家科技支撑计划(2015BAD07B02)。

摘　　要：为了解抚育采伐对塞罕坝自然保护区人工林林分结构的影响,以塞罕坝自然保护区樟子松人工林为研究对象,对不同抚育强度下樟子松人工林的径级结构及空间分布格局进行了研究。结果表明:塞罕坝保护区樟子松人工林分化明显,胸径变化范围较大,在4~32 cm之间,且小径级林木所占比例较大;伐前与伐后林分径级结构均趋于Weibull分布,但伐后的径级结构与Weibull分布更加接近;抚育间伐后,林分径级分布右偏系数增加,大径级林木所占比例增大;在4个不同尺度(5 m×5 m、5 m×10 m、10 m×10 m、15 m×10 m)上,抚育间伐前樟子松人工林的空间分布格局为聚集分布或随机分布,抚育间伐后使其空间分布格局趋于随机分布或均匀分布,同时,聚集程度随抚育间伐强度的增加而下降。抚育采伐不但降低了塞罕坝自然保护区人工林的林分密度,也使林分的径级结构及空间分布格局得到了优化。In order to understand the effect of thinning on the structure of Pinus sylvestris var.mongolica plantation in Saihanba Nature Reserve,the diameter structure and spatial distribution pattern of Pinus sylvestris var.mongolica plantations under different tending intensities were studied.The results showed that there was obvious differentiation in the Pinus sylvestris var.mongolica plantation in Saihanba Nature Reserve,and DBH(diameter at breast height)ranged from 2 cm to 34 cm,with a big proportion of small diameter trees.The stands'DBH structure tended to follow the Weibull distribution both before and after the thinning,and the data after the thinning were closer to the Weibull distribution.After thinning,the skewness coefficient of the stands′DBH structure increased,meaning the proportion of trees with bigger DBH increased.On the 4 scales(5 m×5 m,5 m×10 m,10 m×10 m,15 m×10 m),the spatial distribution patterns of Pinus sylvestris var.mongolica plantation were aggregated distribution or random distribution before thinning,and they tended to become random distribution or uniform distribution after thinning.At the same time,the aggregation degree decreased with the increase of thinning intensity.In conlusion thinning not only decreased the density of Pinus sylvestris var.mongolica plantation in Saihanba Nature Reserve but also optimized the stand DBH structure and spatial distribution patterns.

关 键 词：塞罕坝地区 自然保护区 樟子松人工林 林分结构 空间分布格局 

分 类 号：S718.5[农业科学—林学]