Effects of Experimental Throughfall Exclusion on Soil Respiration in a Continental Coniferous Stand, South Korea

被引:4
|
作者
Kim, Ikhyun [1 ]
Chae, Hee Mun [2 ]
Choi, Byoungkoo [2 ]
机构
[1] Kangwon Natl Univ, Dept Forestry & Environm Syst, Chunchon 24341, South Korea
[2] Kangwon Natl Univ, Dept Forest Environm Protect, Chunchon 24341, South Korea
来源
FORESTS | 2020年 / 11卷 / 09期
基金
新加坡国家研究基金会;
关键词
forest soil; throughfall exclusion; soil CO(2)efflux; heterotrophic soil respiration; autotrophic soil respiration; soil bacterial community; Korean pine; AMAZONIAN RAIN-FOREST; CARBON-DIOXIDE; CLIMATE-CHANGE; CO2; EFFLUX; HETEROTROPHIC RESPIRATION; AUTOTROPHIC RESPIRATION; MICROBIAL CONTRIBUTIONS; EXPERIMENTAL DROUGHT; WATER AVAILABILITY; MINERAL-NUTRITION;
D O I
10.3390/f11090972
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
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 (Q(10)= 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.
引用
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页数:21
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