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    • Climatic implications of δ13C and δ18O ratios from C3 and C4 plants growing in a tropical montane habitat in southern India

      Geeta Rajagopalan R Ramesh R Sukumar

      Articles Volume 24 Issue 4 December 1999 pp 491-498

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/024/04/0491-0498

    • Keywords

       

      Stable isotopes; palaeoclimate; C3/C4 plants; peats

    • Abstract

       

      The stable carbon and oxygen isotope ratios in cellulose of C3 and C4 plants growing on the surface of a montane peat bog in the Nilgiri hills, southern India, were measured. The mean monthly δ13C values in cellulose of both C3 and C4 plants are found to be significantly related to rainfall, while the δ18O values are sensitive to changes in maximum temperature and relative humidity of the region. Further, higher δ18O values were observed in C4 plants compared to C3 plants, suggesting that C4 plants are probably less sensitive to relative humidity as compared to C3 plants and are able to photosynthesize even during drier conditions. The plant isotope-climate correlations thus established can be used for reconstructing the past temperature and rainfall conditions of the tropics from the isotopic ratios of peat deposits, derived from a mixture of C3 and C4 plants in the region.

    • Author Affiliations

       

      Geeta Rajagopalan1 R Ramesh1 2 R Sukumar1

      1. Centre for Ecological Sciences, Indian Institute of Science, Bangalore - 560 012, India
      2. Earth Science and Solar System Division, Physical Research Laboratory, Ahmedabad - 380 009, India

    • Dates

       
      Published
      December 1999
      Manuscript received
      23 April 1999
      Accepted
      21 October 1999

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