Base-cation cycling by individual tree species in old-growth forests of Upper Michigan, USA
Base-cation cycling by individual tree species in old-growth forests of Upper Michigan, USA
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DOI：
10.1007/s10533-004-4726-2
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发表时间：
2005-06-01
期刊：
影响因子：
4
通讯作者：
Balster, N
中科院分区：
文献类型：
--
作者：
Fujinuma, R;Bockheim, J;Balster, N
在美国密歇根州西北部的沙地、寒带混合、典型单坡型硬木-铁杉原生林中，研究了不同树种对糖槭（Acer saccharum Marsh.）、椴木（Tilia americana L.）和铁杉（Tsuga canadensis L.）两个生长季节碱基阳离子（Ca、Mg、K、Na）分布和循环的影响。估算了各树种5株复制树的生物量、森林地面和矿质土壤（0-15 cm和15-40 cm）池中的碱阳离子；测量的通量包括体积降水、通流、茎流、凋落物、森林地表渗滤液、矿化+风化、浅层土壤渗滤液和深层土壤渗滤液。这三个物种在单树生态系统中碱离子积累的位置不同。在这3个单树生态系统中，木质生物质中碱离子含量最多的是糖枫，而铁杉和椴木在矿质土壤上部40 cm处含量最多。碱基-阳离子池排序为：木本生物质中糖枫、椴木、铁杉；糖枫，椴木>叶铁杉；铁杉bbb糖枫，椴木在森林地面，和椴木bb1糖枫，铁杉在矿物土壤。通过雨水、茎流、森林地表渗滤液和深层土壤渗滤液（仅2000年）的碱基-阳离子通量排名为：椴木bb0糖枫bb1铁杉bb1。我们的测量结果表明，养分循环中与物种相关的差异足以在短时间间隔（< 65年）内产生土壤碱基阳离子含量的显著差异。此外，这些物种介导的差异可能是控制大湖区北部硬木铁杉生态系统空间格局和土壤过程的重要因素。
The influence of individual tree species on base-cation (Ca, Mg, K, Na) distribution and cycling was examined in sugar maple (Acer saccharum Marsh.), basswood (Tilia americana L.), and hemlock (Tsuga canadensis L.) in old-growth northern hardwood - hemlock forests on a sandy, mixed, frigid, Typic Haplorthod over two growing seasons in northwestern Michigan. Base cations in biomass, forest floor, and mineral soil (0-15 cm and 15-40 cm) pools were estimated for five replicated trees of each species; measured fluxes included bulk precipitation, throughfall, stemflow, litterfall, forest-floor leachate, mineralization + weathering, shallow-soil leachate, and deep-soil leachate. The three species differed in where base cations had accumulated within the single-tree ecosystems. Within these three single-tree ecosystems, the greatest quantity of base cations in woody biomass was found in sugar maple, whereas hemlock and basswood displayed the greatest amount in the upper 40 cm of mineral soil. Base-cation pools were ranked: sugar maple > basswood, hemlock in woody biomass; sugar maple, basswood > hemlock in foliage; hemlock > sugar maple, basswood in the forest floor, and basswood > sugar maple, hemlock in the mineral soil. Base-cation fluxes in throughfall, stemflow, the forest-floor leachate, and the deep-soil leachate (2000 only) were ranked: basswood > sugar maple > hemlock. Our measurements suggest that species-related differences in nutrient cycling are sufficient to produce significant differences in base-cation contents of the soil over short time intervals (< 65 years). Moreover, these species-mediated differences may be important controls over the spatial pattern and edaphic processes of northern hardwood-hemlock ecosystems in the upper Great Lakes region.