Diurnal patterns of CO 2 and H 2 O exchange of the Arctic sedges Eriophorum angustifolium and E. vaginatum (Cyperaceae)
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 and compared their respons...
| Published in: | American Journal of Botany |
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| Main Authors: | , , |
| Other Authors: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1998
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.2307/2446442 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2446442 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2446442 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.2307%2F2446442 |
| Summary: | 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 and compared their responses to changes in light, air temperature, and humidity. Mean photosynthetic response to light was 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. |
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