Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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A Comparison of Methods for Estimating the Productivity of Zostera marina

  • Park, Sang-Rul (Department of Biological Sciences, Pusan National University) ;
  • Li, Wen-Tao (Department of Biological Sciences, Pusan National University) ;
  • Kim, Seung-Hyeon (Department of Biological Sciences, Pusan National University) ;
  • Kim, Jae-Woo (Department of Biological Sciences, Pusan National University) ;
  • Lee, Kun-Seop (Department of Biological Sciences, Pusan National University)
  • Published : 2010.02.28
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Abstract

Because seagrass production significantly contributes to the biodiversity and production of coastal and estuarine ecosystems, accurate estimation of seagrass productivity is a critical step toward understanding the ecological roles of seagrass in these ecosystems. To develop an accurate and effective method of measuring seagrass productivity, we estimated leaf productivity of eelgrass (Zostera marina) on the southern coast of Korea using three methods, the conventional leaf marking method, the elongation-mass method (Short '87 method), and the plastochrone method. In each season, shoots were pierced through the bundle sheath using a hypodermic needle and were collected after 2-4 weeks had elapsed to estimate their productivity. The leaf elongation and the leaf plastochrone intervals varied significantly among seasons. On an annual basis, the conventional leaf marking method showed the lowest leaf productivity estimates compared to the elongation-mass method and the plastochrone method, suggesting that the conventional leaf marking method underestimated leaf productivity as it ignored leaf maturation processes and new leaf growth within the sheath. Since the elongation-mass method considered leaf maturation processes, this method produced higher leaf productivity estimates than the conventional leaf marking method. On an annual basis, the plastochrone method produced the highest leaf productivity estimates. Below-ground productivity, which can be easily estimated using the plastochrone method, ranged between 3.29 and 5.73 (mg dry weight $shoot^{-1}\;day^{-1}$) and accounted for about 17.8% to 30.3% of total productivity. Because of the high contributions of below-ground productivity to total seagrass production, we suggest that the plastochrone method is an effective and simple technique for assessing both above- and below-ground productivities.

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References

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