Factors influencing the distribution of two co-occurring dwarf bamboo species (Sasa kurilensis and S-senanensis) in a conifer-broad leaved mixed stand in northern Hokkaido
Factors influencing the distribution of two co-occurring dwarf bamboo species (Sasa kurilensis and S-senanensis) in a conifer-broad leaved mixed stand in northern Hokkaido
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DOI：
10.1007/s11284-004-0009-6
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发表时间：
2005-01-01
影响因子：
2
通讯作者：
Yoshida, T
中科院分区：
文献类型：
--
作者：
Noguchi, M;Yoshida, T
本文研究了两种矮生竹种栗竹Sasa kurilensis（Ruprecht）Makino et柴田和栗竹Sasa kurilensis（Ruprecht）Makino分布的影响因子。senanensis（Franchet et Savatier）Chelder，在日本北方的针阔混交林中进行选择性采伐。本文首先根据30年的树木普查资料，寻找决定样地（面积1683.14m2）优势种的可能的决定因子（物理环境和林下条件）。然后，我们研究了这些因素对优势种的秆密度和高度的影响。线性判别分析表明，物理环境条件是决定分布的重要因素;在早春，千岛草在坡度陡、形状凸、积雪深的地块上占优势。多元回归分析表明，在陡坡上，两种植物的秆密度和高度均显著下降。此外，周围针叶树（地块周围半径7.5米）的断面积（BA）的总和，以及在BA在过去30年的变化，对这两个物种的秆高产生了负面影响。自然或人工干扰引起的上层树木的减少，将增加矮秆竹生物量。在了解该地区天然林的动态时，应考虑物理环境和上层条件的影响，通过两种矮生竹种的优势发挥作用。
We have investigated the factors influencing the distribution of co-occurring two dwarf bamboo species, Sasa kurilensis (Ruprecht) Makino et Shibata and S. senanensis (Franchet et Savatier) Rehder, within a conifer-broadleaved mixed stand managed with selection cutting in northern Japan. We first sought the possible determinant factors (physical environment and overstory conditions based on 30 years' tree census data) deciding the dominant species in the plots (1683.14 m(2) area). We then examined the effects of these factors on the culm density and height of the dominant species. Linear discriminant analysis indicated that physical environmental conditions are important in determining the distribution; S. kurilensis tended to dominate plots with steep slope, convex shape and deep snow in early spring. Multiple regression analyses showed that culm density and height decreased significantly on steep slopes for both species. Also, the sum of the basal area (BA) of surrounding conifers (7.5 m radius around the plot), as well as the change in BA over the previous 30 years, had a negative influence on the culm height of both species. A reduction in overstory trees, caused by natural or artificial canopy disturbances, would increase the dwarf bamboo biomass. The effects of physical environment and overstory conditions, working through the dominance of the two dwarf bamboo species, should be taken into account in understanding the dynamics of natural forests in this region.