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제안 방법
- The reed stems employed in this study, therefore, were chosen proportionally in the ratio of new to old numbers. Both new and old stems of Phragmites taken from five inside sampling points in respective reed zones were cut above the rhizomes and returned to the laboratory. The substrate section used was a length of approximately 5 cm.
- 1). Field investigations were conducted on calm days during summer (July) and winter (December) at the boundary between the littoral and pelagic zones, where the Phragmites zone extended from land to water. In the present investigations, a mesotrophic St.
- (2004) noted that the stoichiometric ratio of phytoplankton was strictly influenced by the surface adsorbed and intracellular phosphorus pools. Then, the EC : EN : ECP and PC : PN : PCP ratios without luxurious and adsorbed phosphorus were calculated to evaluate the originated cellular ratio and to assess the accurate limitation. The weight ratios of EC : EN: ECP ranged from 35 :12 :1 to 108:32:1 and 84 :18 :1 to 125 :15 :1 in both summer and winter seasons, The PC : PN: PCP ratios, on the other hand, were 56 : 8:1 to 108:15 :1 and 55 :11:1 to 215 : 29 : 1 in both seasons, respectively.
- The standing crop of epiphytic algae on old reed stems was generally greater than that on new reed stems. Then, the field investigations were carried out in both seasons of small (July) and large amounts of epiphytic substances (December). The reed stems employed in this study, therefore, were chosen proportionally in the ratio of new to old numbers.
- To evaluate the potential limitation in respective reed zones, the ratio of the areal total nitrogen (ATN: sum of TNN, DON, PN and EN amounts per unit area of reed zone) to phosphorus (ATP: sum of DIP, DOP, PP and EP amounts per unit area of reed zone) was calculated. The ATN : ATP ratio was 13.
이론/모형
- Dissolved organic phosphorus (DOP) was determined by the method of Menzel and Corwin (1965). Dissolved organic carbon (DOC) was determined by Menzel and Vaccaro (1964) using an infra-red analyzer (Beckman, Model 864), dissolved organic nitrogen (DON) by the Kjeldahl technique with selenium dioxide as a catalyst described by Mitamura (1994).
- (1967), silicate after Mullin and Riley (1955). Dissolved organic phosphorus (DOP) was determined by the method of Menzel and Corwin (1965). Dissolved organic carbon (DOC) was determined by Menzel and Vaccaro (1964) using an infra-red analyzer (Beckman, Model 864), dissolved organic nitrogen (DON) by the Kjeldahl technique with selenium dioxide as a catalyst described by Mitamura (1994).
- Epiphytic or particulate phosphorus (EP or PP) was analyzed using the method described by Menzel and Corwin (1965) after digestion with perchloric acid and nitric acid (Saijo and Mitamura, 1995). Acid extractable inorganic phosphorus (AP) in EP or PP was measured as the fraction of the extracted phosphorus by acidification treatment.
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