Different winter soil respiration between two mid-temperate plantation forests
作者:Decai Gaoa,b, Bo Penga,b, Zhenzhen Fana,b, Guangting Peia,b, Edith Bai
摘要:Larch and Chinese pine plantation forests are important carbon (C) sinks in the temperate regions, especially in
China. However, their soil respiration in winter is still poorly studied. Here we explored the different microbial
characteristics and winter soil respiration in larch and Chinese pine plantation forests in northeastern China,
which has similar climate and basic soil characteristics. Results showed that both mean and cumulative winter
soil CO2 fluxes were significantly higher in Chinese pine forest (0.45 µmol m−2 s−1 and 46.39 g C m−2, respectively) than in larch forest (0.25 µmol m−2 s−1 and 25.92 g C m−2, respectively). Snow depth and inorganic
nitrogen (N) could not explain the differences in winter soil respiration between the two sites. Instead, Chinese
pine forest had higher soil microbial biomass, fungi abundance, F/B (ratio of fungi to bacteria), and extracellular
enzymatic activities (EEAs) than larch forest, which could lead to higher winter soil respiration in Chinese pine
forest than in larch forest. Our findings indicated that the thermal insulation effect of litter cover was important
to winter soil respiration, especially when the snow cover depth was less than 30 cm. Soil microbes played a
more important role in soil respiration than soil nutrient status and should be carefully considered for better
estimation of the C budget in different forest ecosystems. Although soil respiration was higher in Chinese pine
forest, soil organic C content was also higher, suggesting its better C sequestration capacity than larch forest.
关键词:Snow cover CO2 flux Microbe Extracellular enzymatic activities Fungi
论文方向:[{"id":852,"name":"林学"}]
发表期刊:
数字识别码:10.1016/j.foreco.2017.11.029
是否作者本人: 否
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