Root Distribution of Young Trees of Typical Species in the Northern Region of Yanshan Mountains

doi:10.13466/j.cnki.lyzygl.2018.04.003

Abstract

Abstract:

In order to understand the spatial distribution of tree roots in the northern mountain region of Hebei Province,this study chose four tree species which grow well for seven years and have similar growth conditions:Pinus tabuliformis,Pinus sylvestris var.mongolica,Quercus mongolica, Larix principis-rupprechtii as the research object.Our objective was to study the spatial structure characteristics of four tree species roots (horizontal distribution,vertical distribution,root distribution of different diameter classes).The results show that the horizontal distribution and volume of roots of Pinus sylvestris var.mongolica and Pinus tabuliformis are higher than those of the other two species,and the density of root length and root area are lower.Compared with other tree species,the root system of Larix principis-rupprechtii has a shallower soil layer and a smaller soil volume,but the root length density and root area density are higher than those of the other three species,and the root system of Larix principis-rupprechtii is more concentrated in soil.The horizontal distribution range of root system of each tree species is much larger than that of the aboveground,and the root width and crown width of Pinus sylvestris var.mongolica and Quercus mongolica are larger,reaching 3.82 and 3.09 respectively.What’s more,the biomass,root length and surface area of root system decreased with the increase of the distance from the trunk and the depth of root,but the opposite is true for specific root length.Because of the bare root seedling afforestation technology,the root width,biomass,specific root length and specific root area of Quercus mongolica are lower than those of other three tree species,so direct seeding afforestation or container seedling afforestation is recommended for Quercus mongolica. According to the distribution characteristics of root system in soil, Pinus tabuliformis and Pinus sylvestris var.mongolica are more adaptable to poor and arid soil,but the root distribution of Larix principis-rupprechtii is shallower and more concentrated,which should be influenced by soil drought stress.

Key words: tree species, root, spatial distribution, specific root length, specific root area

CLC Number:

HOU Haichao, DING Li, XU Zhongqi, WANG Li, ZHAO Yu. Root Distribution of Young Trees of Typical Species in the Northern Region of Yanshan Mountains[J]. FOREST RESOURCES WANAGEMENT, 2018, (4): 10-16.

Figures/Tables 8

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树种	年龄/a	林分密度/(株/hm²)	地径/cm	树高/m	冠幅/m
华北落叶松	7	1965	4.75±0.54	2.34±0.15	1.51±0.21
油松	7	1963	5.18±0.61	1.53±0.09	1.35±0.13
樟子松	7	1972	5.06±0.62	1.54±0.06	1.12±0.16
蒙古栎	7	1967	1.67±0.03	0.90±0.13	0.76±0.14