Effects of Experimental Throughfall Exclusion on Soil Respiration in a Continental Coniferous Stand, South Korea
| Autor: | Byoungkoo Choi, Ikhyun Kim, Hee Mun Chae |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Biogeochemical cycle
010504 meteorology & atmospheric sciences Korean pine Q10 Growing season heterotrophic soil respiration 01 natural sciences Soil respiration soil CO2 efflux Precipitation 0105 earth and related environmental sciences soil bacterial community Forestry 04 agricultural and veterinary sciences Soil carbon lcsh:QK900-989 Throughfall forest soil Agronomy throughfall exclusion Soil water 040103 agronomy & agriculture autotrophic soil respiration lcsh:Plant ecology 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Forests, Vol 11, Iss 972, p 972 (2020) Forests Volume 11 Issue 9 |
| ISSN: | 1999-4907 |
| Popis: | Severe droughts and changing precipitation patterns could alter the biogeochemical properties of the soil, affecting soil carbon cycles in forest ecosystems. A throughfall exclusion (TFE) experiment was conducted in a continental climate coniferous stand in Gangwon Province, Korea, to examine the effects of excluding rainfall on total soil respiration (SR), heterotrophic soil respiration (HR), autotrophic soil respiration (AR), sapling diameter growth, and soil bacterial communities from July 2016 to October 2017. The soil water content (SWC) was significantly decreased by the exclusion of the throughfall, resulting in changes in the bacterial communities, and subsequently a decrease in HR. Although AR did not present significant differences between the control and TFE plots, the rate of sapling growth was significantly lower in the TFE plots compared with that in the control plots. An exponential function relating SR to soil temperature accounted for 0.61% and 0.82% of the variance in SR in the control and TFE plots, respectively (Q10 = 2.48 and 2.86, respectively). Furthermore, a multivariate nonlinear model based on soil temperature and SWC explained 0.89% and 0.88% of the variance in SR in the control and TFE plots, respectively. When soil temperature was high, SR showed high fluctuations due to SWC variation. However, when SWC was low, we detected relatively small fluctuations in SR due to soil temperature. The results of this study show that the activity of soil microbial and root respiration during the growing season may be lower under future drought conditions. |
| Databáze: | OpenAIRE |
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