不同茎密度挪威云杉林分细根数量、垂直分布及形态

IF 1 Q3 PLANT SCIENCES Plant Root Pub Date : 2011-01-01 DOI:10.3117/PLANTROOT.5.46
S. Kucbel, P. Jaloviar, Jozef Špišák
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引用次数: 20

摘要

研究了林分密度对直径小于2mm细根数量和形态参数的影响。结果证实了不同密度林分细根分布和总细根质量的差异。茎密度较低的挪威云杉林分总体细根质量较低,但单株细根质量较高。在枯落物(Ol, Of-horizons)中,细根只存在于密度较高的样地。0 ~ 10 cm层细根生物量累积比例,密度较低的小区达67%,密度较高的小区达78%。在低密度样地,所有分析参数均发现直径小于0.25 mm的细根所占比例较低。比根长、根表面积和根组织密度反映了调查样地细根直径结构的不同。我们认为林分密度对细根系统有显著的影响,特别是通过凋落物和a层上部水分状况的变化。挪威云杉林分虽然单株细根动态较高,但茎密度较低的挪威云杉林分不能有效利用整个土壤空间。
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Quantity, vertical distribution and morphology of fine roots in Norway spruce stands with different stem density
In the study, the influence of stand density on quantitative and morphological parameters of fine roots with the diameter less than 2 mm was analysed. The results confirmed the differences of the fine root distributions and the total fine root mass between stands with different density. The Norway spruce stand with lower stem density has a lower overall fine root mass but, at the same time, a higher fine root mass regarding the single tree. In the litter (Ol, Of-horizons), the fine roots are present only in the plot with higher density. The cumulative proportion of fine root biomass in the layer 0-10 cm reaches 67% in the plot with lower density and 78% in the plot with higher density. In the lower density plot, a lower proportion of fine roots in the diameter class under 0.25 mm was found in all analysed parameters. Specific root length, root surface area and root tissue density reflect the different diameter structure of fine roots in the surveyed plots. We suppose the stand density significantly affects the fine root system, espe- cially by the change of moisture regime in the litter and in the upper parts of the A-horizon. Despite the high fine root dynamics of single trees, the Norway spruce stand with the lower stem density is not able to effectively utilize the entire soil space.
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
期刊介绍: Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.
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