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1

Decomposition rate of two tea types in two different forestry niches

Żelazo Patrycja, Fyda Janusz

Science, Technology and Innovation

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2022

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Vol. 15, no. 1-2

8--16

EN

Organic matter decomposition is one of the most important processes associated with flow of energy and recirculation of organic matter in natural environments. Using commercially sold tea bags of Lipton Sencha green tea (SGT) and Lipton Ceylon black tea (CBT) their decomposition was studied in mixed and coniferous forest. At both stations 25 bags of each tea were buried for a period of 3 months. After elapsed time, the bags were dug up, dried, and the mean weight loss of organic material for each tea type and ecosystem was calculated. In the mixed forest the average weight loss of tea bags was 46.8% for Sencha and 32.1% for Ceylon tea and respectively 44.6% and 30.6%, in the coniferous forest. Statistical analysis test (ANOVA) revealed a statistically significant difference (p < 0.05) in rate of decomposition between tea types, however the differences between the decomposition of the same type of tea on both type of forest were insignificant.

2

Decomposition of Fine Woody Debris from Main Tree Species in Lowland Oak Forests

Ostrogović M. Z., Marjanović H., Balenović I., Sever K., Jazbec A.

Polish Journal of Ecology

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2015

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Vol. 63, nr 2

247--259

EN

Decomposition is an important carbon flux that must be accounted for in estimates of forest ecosystem carbon balance. Aim of this research is to provide estimate of fine woody debris decomposition rates for different tree species and sample sizes also taking into account the influence of specific microsite meteorological conditions on decomposition rates. In this paper we present results of the first two years of the experiment designed to last six years. Study was conducted in managed lowland oak forest in central Croatia. Decomposition rates (k) of fine woody debris (diameter 0.5–7 cm) for four species (Querus robur L., Carpinut betulus L., Alnus glutinosa Gaernt., Fraxinus angustifolia L.) in four size classes were estimated using litter bag method and mass loss equation of Olson (1963). Overall average k in our study was 0.182 ± 0.011 year-1. Results indicate that decomposition rate is affected by the size of the debris, with the smallest diameter branches (<1 cm) decomposing is significantly faster (k = 0.260 ± 0.018, P <0.05) than the larger one. Tree species from which debris had originated also affected decomposition, although to a lesser extent, with hornbeam samples having significantly (P <0.05) higher average decomposition rate (0.229 ± 0.028), compared to that of ash samples (0.141 ± 0.022). Proportion of variability in k explained by variables ‘species’ and ‘size class’ was assessed with general linear model (R2 = 0.644) also taking into account variables like soil temperature and soil water content. Sample size class explained 22.2%; species explained only 9.4%, while soil water content and temperature combined explained 32.8% of the variance of k. Rate constants obtained within this study might be useful in modelling ecosystem carbon balance for similar lowland forest ecosystems in Europe.

3

Dynamics of organic matter transformation in waste waters from sugar industry purified in accumulation lagoons

Pulikowski K.

Journal of Water and Land Development

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1999

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no. 3

113-124

EN

Obtained equations allow for calculating BOD5 of sewage from sugar industry treated in 4 different types of accumulation lagoons on any day of intensive self-purification (May-September) basing on a single BOD5 measurement in the initial phase of this period and on the course of air temperature (a sum of positive temperature-days). Adopting an average course of air temperatures from a long-term period it is possible already after the first measurement to estimate BOD5 in a phase of sewage discharge to the receiver. Established equations refer to particular types of accumulation lagoons.

PL

Uzyskane równania pozwalają obliczyć BZT5 ścieków cukrowniczych oczyszczanych w 4 różnego typu zbiornikach akumulacyjnych w dowolnym dniu okresu intensywnego samooczyszczania ścieków (marzec-wrzesień) na podstawie jednego oznaczenia wartości BZT5, wykonanego w początkowej fazie tego okresu i przebiegu temperatury powietrza (sumy dodatnich temperaturo-dni). Przyjmując średni przebieg temperatur powietrza z wielolecia już po wykonaniu pierwszego oznaczenia istnieje możliwość wstępnego oszacowania wartości BZT5 w fazie odprowadzania ścieków do odbiornika. Wyznaczone równania odnoszą się do poszczególnych typów zbiorników akumulacyjnych.