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Volume 32 Issue 3
Sep.  2013
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Article Navigation >  CARSOLOGICA SINICA  > 2013  >  32(3): 247-252
ZHANG Cheng, XIE Yun-qiu, NING Liang-dan, YU Hong, WANG Jin-liang, LI Feng. Characteristics of δ13C in typical aquatic plants and carbon sequestration in the Huixian karst wetland，Guilin[J]. CARSOLOGICA SINICA, 2013, 32(3): 247-252. doi: 10.3969/j.issn.1001-4810.2013.03.001
Citation: ZHANG Cheng, XIE Yun-qiu, NING Liang-dan, YU Hong, WANG Jin-liang, LI Feng. Characteristics of δ13C in typical aquatic plants and carbon sequestration in the Huixian karst wetland，Guilin[J]. CARSOLOGICA SINICA, 2013, 32(3): 247-252. doi: 10.3969/j.issn.1001-4810.2013.03.001
shu

Characteristics of δ13C in typical aquatic plants and carbon sequestration in the Huixian karst wetland，Guilin

doi: 10.3969/j.issn.1001-4810.2013.03.001

  • Institute of Karst Geology，CAGS / Key Laboratory of Karst Dynamics，MLR & GZAR

  • Publish Date: 2013-09-25
    Abstract
  • Currently，the stability and the velocity of karst carbon sink are two major scientific questions urgently need to be answered. Characteristics of δ13C in major aquatic vegetations in the Huixian karst wetland are discussed in this paper，and the percentages of photosynthetic carbon fixation are estimated by means of double-meta model in which remarkable positive relationship is presented between carbonate anhydrase activity and the value of plant carbon isotope. The Huixian karst wetland，located in Huixian town，Lingui county and 30 km away from Guilin city，is the largest natural wetland in low-altitude area of subtropical zone of China. The wetland is mainly sourced by karst groundwater. To understand the characteristics of δ13C value in different aquatic plants，aquatic plant sampling is conducted on 10-12，August，2011，and 17 aquatic plants are collected in the core zone of this karst groundwater-fed wetland and their δ13C are analyzed. The δ13C values varied from -30.08 ‰ to -18.91 ‰ with an average of -26.65 ‰，in which the maximum is in watermifoil and the minimum is in scripus triqueter. The mean δ13C values of various plants in descending order are -23.91 ‰ (submerged plant)，-27.49 ‰ (hydrophyte)，-28.66 ‰ (emergent plant)，-28.78 ‰ (floating plant) respectively. The results show that the values of HCO3- carbon sequestration range from 4.86 to 64.73 tC/(a?km2) for submerged plants and from 15.68 to 453.01 tC/(a?km2) for emerged plants respectively in the core zone of the wetland with a mean value of 76.74 tC/(a?km2). Furthermore，the fixed HCO3- carbon consumed by photosynthesis is estimated to be 4 466.27 tC/a using this mean value，i.e.，approximately 47 % of HCO3- fed by karst underground streams are consumed by aquatic vegetation photosynthesis in the wetland. Remarkable effect of carbon fixation by aquatic plant shows that the photosynthesis of aquatic plants can not be neglected in karst carbon sink study，especially for net carbon sink estimation in karst region.

     

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