Vertical fine root distributions of western redcedar, western hemlock, and salal in old-growth cedar-hemlock forests on northern Vancouver Island
Vertical fine root distributions of western redcedar, western hemlock, and salal in old-growth cedar-hemlock forests on northern Vancouver Island
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DOI：
10.1139/x02-034
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发表时间：
2002-07
影响因子：
2.2
通讯作者：
Jennifer N. Bennett;B. Andrew;C. Prescott
中科院分区：
文献类型：
--
作者：
Jennifer N. Bennett;B. Andrew;C. Prescott
研究了西部铁杉细根的垂直分布规律。Sarg.）西部红杉（Thuja plicata Donn ex D.）Don）和Salal（Gaultheria shallon Pursh）在北方温哥华岛的古老的雪松-铁杉林中进行了表征。雪松、铁杉和檀香根在林地和上层矿质土壤中的总生物量分别为817、620和187 g·m-2。铁杉和沙巴细根集中在上层林层，而雪松细根在整个剖面上分布均匀。林下土壤和矿质土壤细根密度（g·m-3）与林下土壤细根密度（g·m-3）呈显著正相关，林下土壤细根生物量分布（g·m-2）与林下土壤细根生物量分布（g·m-2）呈显著正相关。只有salal和铁杉根密度显着相关与N浓度。铁杉根密度与全氮呈负相关，沙柳根密度与全氮和可溶性有机氮呈负相关。细根密度的基础上，铁杉和沙巴可能竞争的资源在上层森林地板，而雪松访问资源在较低的有机和矿物土壤层。雪松、铁杉和檀香细根垂直分布的差异可能部分地解释了雪松-铁杉林中3种植物共存和不同生产力的原因。
The vertical distributions of fine roots of western hemlock ( Tsuga heterophylla (Raf.) Sarg.) western redcedar (Thuja plicata Donn ex D. Don), and salal (Gaultheria shallon Pursh) were characterized in old-growth cedar-hemlock forests on northern Vancouver Island. Total biomasses of cedar, hemlock, and salal roots in the forest floor and upper mineral soil were 817, 620, and 187 g·m -2 , respectively. Hemlock and salal fine roots were concentrated in the upper for- est floor, while cedar fine roots were evenly distributed through the profile. Salal and hemlock fine root densities (g·m -3 ) in the forest floor and mineral soil were positively correlated, as were salal and cedar root biomass distributions (g·m -2 ). Only salal and hemlock root densities were significantly correlated with N concentrations. Hemlock root densities were negatively correlated with total N, and salal root densities were negatively correlated with total N and soluble organic N. Based on fine root densities, hemlock and salal probably compete for resources in the upper forest floor, whereas cedar accesses resources in the lower organic and mineral soil horizons. The differences in the vertical distributions of cedar, hemlock, and salal fine roots may partly explain the co-occurrence and different productivities of the three spe- cies in cedar-hemlock forests.