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A Comparison of Methods for Estimating the Productivity of Zostera marina
박상률,Wen-Tao Li,김승현,이근섭 한국생태학회 2010 Journal of Ecology and Environment Vol.33 No.1
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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박상률 한국해양과학기술원 2014 Ocean science journal Vol.49 No.4
The abundance of two Ulva species in unmanipulated and artificial plots was investigated to better understand the ecological aspects of green tides on the intertidal rocky shore of the southern coast of Korea from July 1998 to January 2001. Artificial substrates were made on ceramic tiles (200 cm2) using a mixture of cement and rock and were set up on the rocky substrate in the lower intertidal zone using a hammer and anchor bolts. These settling plates were replaced every 1-2 months. Two Ulva species were recruited continuously for 3-4 months each year. U. pertusa was recruited during summer-autumn, whereas U. linza was recruited during winter-early spring or spring-early summer. However, U. pertusa dominated in the monitoring plots compared with the experimental period, with the exception of 2 months (February and March 2000). These results indicated that U. pertusa may be the main contributor to green tides along the intertidal rocky shores. The two Ulva species showed a positive relationship between density and biomass. This suggests that the physical removal of Ulva masses should be conducted during the early growing season. I hope this study provides valuable information for determining management policies for green tides on intertidal rocky shores.
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Nitrogen Budget of the Eelgrass, Zostera marina in a Bay System on the South Coast of Korea
박상률,김영균,김승현,이근섭 한국해양과학기술원 2013 Ocean science journal Vol.48 No.4
Above- and below-ground productivities and tissue N content were measured monthly to quantify N incorporation to sustain eelgrass growth in Koje Bay on the south coast of Korea from January to December 2002. N acquisition was also estimated through measurements of N uptake kinetics, tissue biomass, and in situ inorganic N concentrations in water column and sediments. Above- and below-ground productivities were highest in summer and lowest in late fall and winter. Leaf tissue N content was highest in December and lowest in July, while rhizome tissue N content was highest in October and lowest in April. Estimated monthly N incorporation by leaf tissues based on the leaf productivity and N content ranged from 0.4 g N m-2 month-1 in November to 2.0 g N m-2 month-1 in May. N incorporation by below-ground tissues ranged from 0.1 g N m-2 month-1 in February to 0.2 g N m-2 month-1 in October. Annual whole plant N incorporation was 14.5 g N m-2 y-1, and N incorporation by leaf tissues accounted for about 87 % of total N incorporation. Maximum uptake rate (Vmax) and half saturation constant (Km) of leaf NH4 + uptake were significantly lower than those of root NH4+ uptake. Above- and below-ground biomass ranged from 20.8 g DW m-2 and 8.6 g DW m-2 in winter to 350.0 g DW m-2 and 81.3 g DW m-2 in spring, respectively. NH4+ concentrations varied from 0.2 to 4.3 mM in water column and from 93.0 to 551.7 mM in sediment pore water. Based on these measurements, annual N acquisition by root tissues contributed slightly higher than that by leaf tissues to total plant N acquisition. During winter, monthly leaf N acquisition was lower than monthly leaf N incorporation. This implies that Z. marina has internal nitrogen retention system to offset the shortage and excess of nitrogen.
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