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Flooded Meadow Communities an Analysis of Their Productivity in a Wet Year

Jana Jakrlová
Folia Geobotanica & Phytotaxonomica
Vol. 3, No. 4 (1968), pp. 345-354
Published by: Springer
Stable URL: http://www.jstor.org/stable/4179504
Page Count: 10
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Flooded Meadow Communities an Analysis of Their Productivity in a Wet Year
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Abstract

The productivity of three plant communities differing in moisture conditions was studied in the river basin of the Dyje near the village of Lanžhot (Southern Moravia). The communities were as follows: Serratuleto-Festucetum commutatae Balátová-Tuláčková 1963, Gratiola officinalis-Carex praecox-suzae subass. Galium boreale Balátová-Tuláčková 1963, and Gratiola officinalis-Carex praecox-suzae subass. Rorippa silvestris Balátová-Tuláčková 1963. The association Gratiola officinalis-Carex praecox-suzae subass. Galium boreale appeared as the most productive one, its biomass maximum ${\rm W}=400\ {\rm g}\.\ {\rm m}^{-2}$ and the maximum ${\rm R}=0.042\ {\rm g}\.\.\ {\rm g}^{-1}\.\ \text{day}^{-1}$, ${\rm C}=4.84\ {\rm g}\.\ {\rm m}^{-2}\.\ \text{day}^{-1}$. Owing to extreme moisture conditions in the year 1966, the association Serratuleto-Festucetum commutatae was also highly productive, as it reached the following maximum of dry matter production: $240\ {\rm g}\.\ {\rm m}^{-2}$, ${\rm R}=0.0388\ {\rm g}\.\ {\rm g}^{-1}\.\ \text{day}^{-1}$, ${\rm C}=4.64\ {\rm g}\.\ {\rm m}^{-2}\.\ \text{day}^{-1}$. The maximum value of dry matter in the association Gratiola officinalis-Carex praecox-suzae subass. Rorippa silvestris was $220\ {\rm g}\.\ {\rm m}^{-2}$. Changes in dry matter production of shoots were evaluated statistically. The dry matter in the underground parts of plants in 1 square metre, collected from the 0-25 cm layer varied from $1,000\ \text{to}\ 2,000\ {\rm g}\.\ {\rm m}^{-2}$. Together with records of the increasing dry matter in the shoots the author kept records of the properties of dead material.

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