Comparison of stable-carbon isotope composition in the growth rings of Isorberlinia doka, Daniella oliveri, and Tamarindus indica and West African climate

Aondover Tarhule, Steven Leavitt

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Inter-ring variations in stable-carbon isotope composition of cellulose in Daniella oliveri, Isoberlinia doka, and Tamarindus indica stumps were analyzed for nine trees in the Soudan-Sahel zone of West Africa. This pioneer isotopic study is a contribution to on-going efforts to evaluate the feasibility of extracting proxy climatic records from tree-rings in this area. Our aim is to investigate trends in individual floating δ13C time series to assess if patterns in variability within and between rings are consistent with those in other climatically sensitive tree-ring δ13C series. Samples were collected primarily from tree stumps but kill dates were unknown. Tree age was estimated from stump condition and shoot regrowth. This approach, combined with low sample replication, hindered the establishment of absolute dates. Nevertheless, δ13C and discrimination (Δ13C), absolute values and variability in the time series are similar to those often seen in tree-rings. Average δ13C values for individual series range from -25.90‰ to -23.72‰ and average Δ13C values from 16.56‰ to 18.99‰. It is well known that seasonal rainfall is inversely related to the δ13C in growth-season-dry environments and positively covaries with Δ. We investigate the possibility of using this relationship to temporally anchor the time series and to identify missing and false rings in wood segments with indistinct growth. The variability in these time series is consistent with expected patterns and shows promise for facilitating the development of stable carbon isotope tree-ring chronologies for West Africa.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalDendrochronologia
Volume22
Issue number1
DOIs
StatePublished - Dec 7 2004

Fingerprint

Tamarindus indica
growth rings
tree ring
carbon isotope
time series analysis
isotopes
stable isotope
stumps
time series
climate
carbon
Western Africa
Isoberlinia
tree stump
Sahel
tree age
dry environmental conditions
regrowth
anchor
chronology

Keywords

  • Climate variability
  • Sahel savanna
  • Soudan savanna
  • Stable-carbon isotope
  • Tree-rings
  • West Africa

ASJC Scopus subject areas

  • Forestry
  • Plant Science
  • Archaeology
  • Geology
  • Ecology

Cite this

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title = "Comparison of stable-carbon isotope composition in the growth rings of Isorberlinia doka, Daniella oliveri, and Tamarindus indica and West African climate",
abstract = "Inter-ring variations in stable-carbon isotope composition of cellulose in Daniella oliveri, Isoberlinia doka, and Tamarindus indica stumps were analyzed for nine trees in the Soudan-Sahel zone of West Africa. This pioneer isotopic study is a contribution to on-going efforts to evaluate the feasibility of extracting proxy climatic records from tree-rings in this area. Our aim is to investigate trends in individual floating δ13C time series to assess if patterns in variability within and between rings are consistent with those in other climatically sensitive tree-ring δ13C series. Samples were collected primarily from tree stumps but kill dates were unknown. Tree age was estimated from stump condition and shoot regrowth. This approach, combined with low sample replication, hindered the establishment of absolute dates. Nevertheless, δ13C and discrimination (Δ13C), absolute values and variability in the time series are similar to those often seen in tree-rings. Average δ13C values for individual series range from -25.90‰ to -23.72‰ and average Δ13C values from 16.56‰ to 18.99‰. It is well known that seasonal rainfall is inversely related to the δ13C in growth-season-dry environments and positively covaries with Δ. We investigate the possibility of using this relationship to temporally anchor the time series and to identify missing and false rings in wood segments with indistinct growth. The variability in these time series is consistent with expected patterns and shows promise for facilitating the development of stable carbon isotope tree-ring chronologies for West Africa.",
keywords = "Climate variability, Sahel savanna, Soudan savanna, Stable-carbon isotope, Tree-rings, West Africa",
author = "Aondover Tarhule and Steven Leavitt",
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AU - Tarhule, Aondover

AU - Leavitt, Steven

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N2 - Inter-ring variations in stable-carbon isotope composition of cellulose in Daniella oliveri, Isoberlinia doka, and Tamarindus indica stumps were analyzed for nine trees in the Soudan-Sahel zone of West Africa. This pioneer isotopic study is a contribution to on-going efforts to evaluate the feasibility of extracting proxy climatic records from tree-rings in this area. Our aim is to investigate trends in individual floating δ13C time series to assess if patterns in variability within and between rings are consistent with those in other climatically sensitive tree-ring δ13C series. Samples were collected primarily from tree stumps but kill dates were unknown. Tree age was estimated from stump condition and shoot regrowth. This approach, combined with low sample replication, hindered the establishment of absolute dates. Nevertheless, δ13C and discrimination (Δ13C), absolute values and variability in the time series are similar to those often seen in tree-rings. Average δ13C values for individual series range from -25.90‰ to -23.72‰ and average Δ13C values from 16.56‰ to 18.99‰. It is well known that seasonal rainfall is inversely related to the δ13C in growth-season-dry environments and positively covaries with Δ. We investigate the possibility of using this relationship to temporally anchor the time series and to identify missing and false rings in wood segments with indistinct growth. The variability in these time series is consistent with expected patterns and shows promise for facilitating the development of stable carbon isotope tree-ring chronologies for West Africa.

AB - Inter-ring variations in stable-carbon isotope composition of cellulose in Daniella oliveri, Isoberlinia doka, and Tamarindus indica stumps were analyzed for nine trees in the Soudan-Sahel zone of West Africa. This pioneer isotopic study is a contribution to on-going efforts to evaluate the feasibility of extracting proxy climatic records from tree-rings in this area. Our aim is to investigate trends in individual floating δ13C time series to assess if patterns in variability within and between rings are consistent with those in other climatically sensitive tree-ring δ13C series. Samples were collected primarily from tree stumps but kill dates were unknown. Tree age was estimated from stump condition and shoot regrowth. This approach, combined with low sample replication, hindered the establishment of absolute dates. Nevertheless, δ13C and discrimination (Δ13C), absolute values and variability in the time series are similar to those often seen in tree-rings. Average δ13C values for individual series range from -25.90‰ to -23.72‰ and average Δ13C values from 16.56‰ to 18.99‰. It is well known that seasonal rainfall is inversely related to the δ13C in growth-season-dry environments and positively covaries with Δ. We investigate the possibility of using this relationship to temporally anchor the time series and to identify missing and false rings in wood segments with indistinct growth. The variability in these time series is consistent with expected patterns and shows promise for facilitating the development of stable carbon isotope tree-ring chronologies for West Africa.

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