Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 2004. Sectio Biologiae. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 25)

Makrai, L., Dulai, S., Polyánka, H., Ertli, T. and Lehoczki, E.: Monitoring of the Functional State of Beds of Common Reed (Phragmites australis) in Shallow Lake Balaton (Hungary) by Means of Chlorophyll Fluorescence Studies

Monitoring of Functional state of Reed..

. 143 Results Fluorescence induction measurements on Phragmites leaves along the shores of Lake Balaton During the three years, we performed a great number of fast and slow fluorescence induction measurements on the reeds leaves of the along the shores of Lake Balaton and Kis-Balaton, with the aim of determining the functional state of the reed populations. The typical fast and slow chlorophyll fluorescence induction curves are depicted in Fig. 1 for LakeBalaton (A) and Kis- Balaton (B), with indications of fluorescence parameters. Figure 2 shows the means±DE and minimum-maximum values of Fo, Fi, Fv/Fm and Rfd of the chlorophyll fluorescence induction parameters of reed the leaves, measured in 1996,1997 and 1998, along the shores of Lake Balaton and in Kis-Balaton. Different letters indicate significant difference between years P<0.05. Since no such measurements had previously been carried out at Lake Balaton, the results obtained in 1996 will serve as the basis of our further examinations. The results of the fluorescence induction measurements in 1997 and 1998 revealed a gradual deterioration of the functional state of the reed-beds as compared with the 1996 situation (Fig. 2). The means±DE values of the fast (Fo, Fi and Fv/Fm) and slow (Rfd) chlorophyll fluorescence induction parameters for Phragmites leaves , measured in 1996, 1997 and 1998, along the northern and southern shores of Lake Balaton and Kis-Balaton are presented in Table l.(The reed-stands located between Balatonkenese and Keszthely are referred to as on the northern side, while those located between the holiday resorts of Balatonberény and Balatonakarattya are referred to as on the southern side). MANOVA analysis of the means of chlorophyll fluorescence induction parameters revealed significant effects of year (Pilai trace=0.380; F=67.0; df=8, 2290, P <0.001), shore (Pilai trace=0.242; F= 39.0; df=8, 2290; P0.001), and year by shore interaction (Pilai trace=0.170; F=13.0; df 16, 4; P<0.001). For comparisons of means, the differences between the data for the years and shores were analysed by using a factorial ANOVA test (Table 2). The above results clear by demonstrate that both components of the chlorophyll fluorescence induction kinetics, i.e. the fast fluorescence rise and the slow decline, can be used to describe the functional state of the photosynthetic apparatus. However, from the data in Table 2 it is obvious that the most marked and reliable differences were observed for the Rfd