Diurnal patterns of CO2 and H2O exchange of the Arctic sedges Eriophorum angustifolium and E-vaginatum (Cyperaceae)
Diurnal patterns of CO2 and H2O exchange of the Arctic sedges Eriophorum angustifolium and E-vaginatum (Cyperaceae)
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DOI：
10.2307/2446442
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发表时间：
1998-04-01
影响因子：
3
通讯作者：
Tenhunen, JD
中科院分区：
文献类型：
--
作者：
Gebauer, RLE;Reynolds, JF;Tenhunen, JD
Eriophorum vaginatum和E. angustifolium分别是排水良好的草丛苔原和永久淹没的湿莎草苔原的主要北极莎草。我们测定了这两个物种在其自然栖息地表皮中的气体交换和水分关系的日进程，比较了它们对光照、空气温度和湿度变化的反应。E. angustifolium和E. vaginatum和碳增益在这两个物种是光限制在大部分的生长季节。在晴朗和干燥的日子里，这两个物种关闭气孔响应高叶到空气的蒸汽压赤字。尽管E.沙枣在静水中生长，对蒸腾失水的控制较严，土壤-根-冠途径的导水率较低。阴道两个物种之间的不同的反应模式进行了讨论的背景下，栖息地条件的差异。
Eriophorum vaginatum and E. angustifolium are dominant arctic sedges of the well-drained tussock tundra and the permanently flooded wet-sedge tundra, respectively. We determined diurnal courses of gas exchange and water relations of the two species in their natural habitat rind compared their responses to changes ill light, air temperature, and humidity. Mean photosynthetic response to light mas similar between E. angustifolium and E. vaginatum and carbon gain in both species was light limited during most of the growing season. On sunny and dry days, both species closed stomata in response to high leaf-to-air vapor pressure deficits. Even though E. angustifolium was growing in standing water, it exhibited a tighter control of transpirational water loss and had lower hydraulic conductivity in the soil-root-shoot pathway than E. vaginatum. The different response pattern between the two species is discussed in the context of differences in habitat conditions.