摘要
以河北省木兰围场国有林场管理局克勒沟林场华北落叶松人工林为研究对象,对标准地内保留密度为400株/hm2、600株/hm2、900株/hm2、1 100株/hm2的华北落叶松在上坡位、中坡位、下坡位的树高和胸径以及物种多样性进行了调查分析,结果表明:在保留密度为600株/hm2时,林木生长最好,树高最大;保留密度小于600株/hm2时,树高随着密度的增大而增大,但大于600株/hm2时,树高会随着密度的增大而呈现降低的趋势;胸径会随着保留密度的增大而减小;对不同密度样地中的植物重要值及物种多样性指数进行了计算,林下草本层植物的数量、多样性指数在保留密度为600株/hm2时达到最大值,之后随着密度的增加均呈递减的趋势。
In this paper, based on the research of Larix principis-rupprechtii of Kelegou Forestry Farm of Mulanweichang Forestry Administration, the tree height and DBH of Larix principis-rupprechtii on uphill, middlehill, downhill slope positions, chosen from suitable sample plots in the density of 400, 600, 900, and 1100 plants/hm2 were investigated and analyzed. The result showed that in the density of 600 plants/hm^2, trees grew the best, with the highest tree height. When in less than 600 plants/hm^2 density, the tree height increased with the density increasing, but decreased with the density increasing at more than 600 plants/hm^2 ,with more and more smaller DBH as the density increased. The important value and diversity index of the plants in the sample area under different density was calculated, indicating the understory plant herb layer number and diversity index showed a trend of reduceing with the increase of density, and reached the maximum in the density of 600 plants/hm^2.
出处
《河北林果研究》
2015年第1期1-4,共4页
Hebei Journal of Forestry and Orchard Research
基金
河北省林业科学技术研究项目"木兰林区森林流域经营关键技术研究"(1305448)
关键词
密度
华北落叶松
胸径
物种多样性
影响
density
Larix principis-rupprechtii.
DBH
diversity of species
influence
