C<sub>4</sub> grasses from the boreal forest region of northwestern Canada

DOI Web Site 被引用文献2件

書誌事項

公開日
1988-12-01
権利情報
  • http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining
DOI
  • 10.1139/b88-329
公開者
Canadian Science Publishing

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説明

<jats:p> Six C<jats:sub>4</jats:sub> grasses (Distichlis stricta, Muhlenbergia glomerata var. cinnoides, M. mexicana, M. richardsonis, Spartina gracilis, S. pectinata) were found in grassy openings in the boreal forest of northwestern Canada. High carbon isotope ratios and Kranz anatomy confirmed that these northern populations are functionally C<jats:sub>4</jats:sub> grasses. Muhlenbergia mexicana was assumed to be a C<jats:sub>4</jats:sub> grass on the basis of published data. Recent collections of C<jats:sub>4</jats:sub> plants tended to have more negative δ<jats:sup>13</jats:sup>C values than older collections from northern locations, which may reflect decreases in δ<jats:sup>13</jats:sup>C of atmospheric CO<jats:sub>2</jats:sub> over time. In general, northern C<jats:sub>4</jats:sub> species had lower δ<jats:sup>13</jats:sup>C values than those reported for their southern counterparts. The boreal climate in the north supports C<jats:sub>4</jats:sub> species only where the mean minimum temperature for July is at least 7.5 °C. C<jats:sub>4</jats:sub> grasses were found in microsites warmed by high irradiance or geothermal activity; many of the sites had saline substrates. Northern C<jats:sub>4</jats:sub> populations are rare and unique in the boreal flora and deserve special protection. </jats:p>

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