Department of Entomology and Environmental Protection, Faculty of Agronomy, Horticulture and Bioengineering, Poznań University of Life Sciences, Dąbrowskiego 159, 60-594 Poznań, Poland.
Laboratory of Bioclimatology, Department of Ecology and Environmental Protection, Faculty of Environmental Engineering and Mechanical Engineering, Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland.
Sci Total Environ. 2021 Jun 1;771:145452. doi: 10.1016/j.scitotenv.2021.145452. Epub 2021 Jan 28.
The Tea Bag Index (TBI) method was used to estimate the litter decomposition rate in peatland exposed for climate manipulation (increased temperature and reduced precipitation) at two contrasting sites differing in water table depth (WTD) dynamics. To manipulate climate on peatland, the prototyped Open Top Chambers (OTC) and automated rain-out shelters were used. OTCs increased daytime air temperatures by ~1.7 °C at the driest plots exposed for an increase of air temperature and reduced precipitation, while the increase of the average daily air temperature was lower than 0.9 °C. However, OTCs cooled down the peat temperature even by 0.8 °C and this effect was most pronounced for daytime rather than night-time conditions. The precipitation amount was reduced by 26%. The tea bags were buried at 8 cm depth for 83 and 172 days starting from the 19th of April 2019. Our observation proved that although decomposition rates were dependent on temperature, WTD and its fluctuations are the main factors controlling the rates of litter decomposition in waterlogged ecosystems like ours. At waterlogged Sphagnum-dominated peatlands, the interrelation between different environmental factors may mitigate the impact of warming and reduced precipitation on litter decomposition.
茶包指数（TBI）法被用于估计在两个具有不同水位动态（WTD）特征的对比地点的泥炭地暴露于气候变化（温度升高和降水减少）下的凋落物分解率。为了在泥炭地进行气候变化操纵，使用了原型化的开顶式气室（OTC）和自动化的雨淋棚。OTC 在最干燥的试验田中增加了白天的空气温度，增加空气温度和减少降水的试验田增加了约 1.7°C，而平均每日空气温度的增加低于 0.9°C。然而，OTC 甚至冷却了泥炭地温度，0.8°C 的降温效果在白天而非夜间条件下最为显著。降水减少了 26%。茶包于 2019 年 4 月 19 日从 8 厘米深开始埋置，分别埋置了 83 天和 172 天。我们的观察结果证明，尽管分解率取决于温度，但 WTD 及其波动是控制像我们这样的水饱和生态系统中凋落物分解率的主要因素。在水饱和的泥炭藓主导的泥炭地中，不同环境因素之间的相互关系可能会减轻升温和降水减少对凋落物分解的影响。
