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  <doc>
    <id>570</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>3156</pageFirst>
    <pageLast>3171</pageLast>
    <pageNumber>16</pageNumber>
    <edition/>
    <issue>6</issue>
    <volume>229</volume>
    <type>article</type>
    <publisherName>Wiley</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>2021-02-17</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Temperature-sensitive biochemical 18O-fractionation and humidity-dependent attenuation factor are needed to predict δ18O of cellulose from leaf water in a grassland ecosystem</title>
    <abstract language="deu">We explore here our mechanistic understanding of the environmental and physiological processes that determine the oxygen isotope composition of leaf cellulose (δ18Ocellulose) in a drought-prone, temperate grassland ecosystem.&#13;
&#13;
A new allocation-and-growth model was designed and added to an 18O-enabled soil–vegetation–atmosphere transfer model (MuSICA) to predict seasonal (April–October) and multi-annual (2007–2012) variation of δ18Ocellulose and 18O-enrichment of leaf cellulose (Δ18Ocellulose) based on the Barbour–Farquhar model.&#13;
&#13;
Modelled δ18Ocellulose agreed best with observations when integrated over c. 400 growing-degree-days, similar to the average leaf lifespan observed at the site. Over the integration time, air temperature ranged from 7 to 22°C and midday relative humidity from 47 to 73%. Model agreement with observations of δ18Ocellulose (R2 = 0.57) and Δ18Ocellulose (R2 = 0.74), and their negative relationship with canopy conductance, was improved significantly when both the biochemical 18O-fractionation between water and substrate for cellulose synthesis (εbio, range 26–30‰) was temperature-sensitive, as previously reported for aquatic plants and heterotrophically grown wheat seedlings, and the proportion of oxygen in cellulose reflecting leaf water 18O-enrichment (1 – pexpx, range 0.23–0.63) was dependent on air relative humidity, as observed in independent controlled experiments with grasses.&#13;
&#13;
Understanding physiological information in δ18Ocellulose requires quantitative knowledge of climatic effects on pexpx and εbio.</abstract>
    <parentTitle language="eng">New Phytologist</parentTitle>
    <identifier type="doi">10.1111/nph.17111</identifier>
    <identifier type="urn">urn:nbn:de:kobv:eb1-opus-5700</identifier>
    <identifier type="issn">0028-646X</identifier>
    <identifier type="issn">1469-8137</identifier>
    <enrichment key="opus.import.data">@articlehttps://doi.org/10.1111/nph.17111, author = Hirl, Regina T. and Ogée, Jérôme and Ostler, Ulrike and Schäufele, Rudi and Baca Cabrera, Juan C. and Zhu, Jianjun and Schleip, Inga and Wingate, Lisa and Schnyder, Hans, title = Temperature-sensitive biochemical 18O-fractionation and humidity-dependent attenuation factor are needed to predict δ18O of cellulose from leaf water in a grassland ecosystem, journal = New Phytologist, volume = 229, number = 6, pages = 3156-3171, keywords = canopy conductance, grassland, isotope-enabled soil–vegetation–atmosphere transfer model (MuSICA), 18O-enrichment of cellulose oxygen isotope composition of cellulose, perennial ryegrass (Lolium perenne), relative humidity, temperature, doi = https://doi.org/10.1111/nph.17111, url = https://nph.onlinelibrary.wiley.com/doi/abs/10.1111/nph.17111, eprint = https://nph.onlinelibrary.wiley.com/doi/pdf/10.1111/nph.17111, abstract = Summary We explore here our mechanistic understanding of the environmental and physiological processes that determine the oxygen isotope composition of leaf cellulose (δ18Ocellulose) in a drought-prone, temperate grassland ecosystem. A new allocation-and-growth model was designed and added to an 18O-enabled soil–vegetation–atmosphere transfer model (MuSICA) to predict seasonal (April–October) and multi-annual (2007–2012) variation of δ18Ocellulose and 18O-enrichment of leaf cellulose (Δ18Ocellulose) based on the Barbour–Farquhar model. Modelled δ18Ocellulose agreed best with observations when integrated over c. 400 growing-degree-days, similar to the average leaf lifespan observed at the site. Over the integration time, air temperature ranged from 7 to 22°C and midday relative humidity from 47 to 73%. Model agreement with observations of δ18Ocellulose (R2 = 0.57) and Δ18Ocellulose (R2 = 0.74), and their negative relationship with canopy conductance, was improved significantly when both the biochemical 18O-fractionation between water and substrate for cellulose synthesis (εbio, range 26–30‰) was temperature-sensitive, as previously reported for aquatic plants and heterotrophically grown wheat seedlings, and the proportion of oxygen in cellulose reflecting leaf water 18O-enrichment (1 – pexpx, range 0.23–0.63) was dependent on air relative humidity, as observed in independent controlled experiments with grasses. Understanding physiological information in δ18Ocellulose requires quantitative knowledge of climatic effects on pexpx and εbio., year = 2021</enrichment>
    <enrichment key="opus.import.dataHash">md5:6741f3b8ca67b6b843f4671e5c3398a9</enrichment>
    <enrichment key="opus.import.date">2023-05-25T13:56:38+00:00</enrichment>
    <enrichment key="opus.import.file">/tmp/phpYiJ72f</enrichment>
    <enrichment key="opus.import.format">bibtex</enrichment>
    <enrichment key="opus.import.id">646f691680b769.97968705</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Regina T. Hirl</author>
    <author>Jérôme Ogée</author>
    <author>Ulrike Ostler</author>
    <author>Rudi Schäufele</author>
    <author>Juan C. Baca Cabrera</author>
    <author>Jianjun Zhu</author>
    <author>Inga Schleip</author>
    <author>Lisa Wingate</author>
    <author>Hans Schnyder</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>canopy conductance</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>grassland</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>isotope-enabled soil–vegetation–atmosphere transfer model (MuSICA)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>18O-enrichment of cellulose oxygen isotope composition of cellulose</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>perennial ryegrass (Lolium perenne)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>relative humidity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>temperature</value>
    </subject>
    <collection role="open_access" number="">open_access</collection>
    <collection role="institutes" number="">Fachbereich Landschaftsnutzung und Naturschutz</collection>
    <collection role="Hochschulbibliographie" number=""/>
    <collection role="Hochschulbibliographie" number="">Zweitveröffentlichung</collection>
    <collection role="Hochschulbibliographie" number="">Referiert</collection>
    <thesisPublisher>Hochschule für nachhaltige Entwicklung Eberswalde</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-hnee/files/570/New_Phytologist_2020_Hirl.pdf</file>
  </doc>
</export-example>
