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冀北山地不同坡向华北落叶松人工林生长量分析

2021-09-12郭建军郭宾良刘海翔周长亮李伟方宏印

防护林科技 2021年2期

郭建军 郭宾良 刘海翔 周长亮 李伟 方宏印

摘 要 为研究冀北山地华北落叶松(Larix principis-rupprechtii)在不同坡向具体的生长状况,以木兰围场北沟林场的华北落叶松林为研究对象,采用树干解析的方法对其胸径和树高的生长量进行研究分析,结果表明:(1)阴坡华北落叶松胸径总生长量整体高于阳坡,其中在15~25 a最为明显,最大差值为0.8 cm。(2)阴坡与阳坡的华北落叶松胸径平均生长量的生长趋势基本一致,但是阴坡华北落叶松胸径平均生长量明显高于阳坡,10~30 a最为明显,最大差值为0.06 cm。(3)阴坡华北落叶松树高总生长量整体高于阳坡,25~35 a最为明显,最大差值为1.3 cm。(4)不同坡向华北落叶松树高平均生长量的增长趋势基本一致,但是阴坡华北落叶松树高平均生长量明显高于阳坡,10~35 a最为明显,最大差值为0.07 cm。

关键词 华北落叶松人工林;坡向;林分生长;冀北山地

中图分类号:S758       文献标识码:A   doi:10.13601/j.issn.1005-5215.2021.02.006

Abstract In order to study the specific growth  of Larix principis- rupprechtii on different slope aspects in northern Hebei mountainous area,the growth of DBH and height of Larix principis- rupprechtii forest in Beigou forest farm of Mulanweichang was studied by using the method of trunk analysis. Result shows that: (1) The total growth of DBH of Larix principis-rupprechtii  on shady slope aspects is higher than that on sunny slope aspects,especially in 15-25 years 8 cm. (2) The average growth trend of DBH of Larix principis- rupprechtii in shady slope aspects is basically the same as that in sunny slope aspects,but the average growth of DBH of Larix principis- rupprechtii in shady slope aspects is significantly higher than that in sunny slope aspects,which is the most obvious in 10-30 years,and the maximum difference is 0.06 cm. (3) The total height growth of Larix principis- rupprechtii on the shady slope aspects was higher than that on the sunny slope aspects,and the maximum difference is 1.3 cm from 25 a to 35 a. (4) The growth trend of average height growth of Larix principis- rupprechtii on different slope aspects is basically the same,but the average height growth of Larix principis- rupprechtii on shady slope aspects is significantly higher than that on sunny slope aspects,which is most obvious from 10 to 35 years,and the maximum difference is 0.07 cm.

Key words Larix principis- rupprechtii plantation;slope aspects;growth of stand;mountains in Northern Hebei Province

林木生长受诸多因素控制,包括自身的生物学因素、人为干扰因素和周围的环境因素等,而林木的立地环境因素又是影响其生长发育最主要的因素之一,包括海拔、坡度、坡位、坡向等,这些立地条件的改变在很大程度上影响着林木的生长发育,因此,通过研究某一不同立地条件下林木的生长量,可作为评定该立地条件的参考指标[1]。

华北落叶松(Larix principis-rupprechtii)为阳性树种,喜光、极耐寒,是我国温带地区极为重要的造林树种。因其生长速度快,对土壤适应能力较强及干形好、易成活等特点成为冀北山地森林面积和蓄积量最大的主要生态树种[2]。……

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