Seasonal Variation in Soil Greenhouse Gas Emissions at Three Age-Stages of Dawn Redwood (Metasequoia glyptostroboides) Stands in an Alluvial Island, Eastern China
Seasonal Variation in Soil Greenhouse Gas Emissions at Three Age-Stages of Dawn Redwood (Metasequoia glyptostroboides) Stands in an Alluvial Island, Eastern China
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DOI：
10.3390/f7110256
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发表时间：
2016-11
期刊：
影响因子：
2.9
通讯作者：
Shan Yin;Xianxian Zhang;J. Pumpanen;Guangrong Shen;Xiancheng Feng;Chunjiang Liu
中科院分区：
文献类型：
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作者：
Shan Yin;Xianxian Zhang;J. Pumpanen;Guangrong Shen;Xiancheng Feng;Chunjiang Liu
温室气体排放是森林土壤碳氮循环的重要组成部分。然而，对不同年龄的水杉林土壤温室气体排放的研究却知之甚少。为阐明种植园年龄和环境因子对土壤温室气体排放的影响，采用静态箱/气相色谱（GC）系统对中国东部某冲积岛土壤温室气体排放进行了连续两年的测定。土壤是CO2和N2 O的源和CH 4的汇，年排放量分别为5.5-7.1 Mg C ha−1 year−1、0.15-0.36 kg N ha−1 year−1和1.7-4.5 kg C ha−1 year−1。土壤温度与CO2排放量呈明显的指数相关，土壤含水量与CO2排放量呈线性负相关。土壤温度对CH 4吸收量和N2 O排放量有显著的正向影响，而CH 4吸收量与土壤含水量、N2 O排放量与土壤含水量的相关性不显著。这些结果意味着，较老的林分可能会导致更多的温室气体从土壤排放到大气中，因为更高的凋落物/根生物量和土壤碳/氮含量相比，年轻的立场。
Greenhouse gas (GHG) emissions are an important part of the carbon (C) and nitrogen (N) cycle in forest soil. However, soil greenhouse gas emissions in dawn redwood (Metasequoia glyptostroboides) stands of different ages are poorly understood. To elucidate the effect of plantation age and environmental factors on soil GHG emissions, we used static chamber/gas chromatography (GC) system to measure soil GHG emissions in an alluvial island in eastern China for two consecutive years. The soil was a source of CO2 and N2O and a sink of CH4 with annual emissions of 5.5–7.1 Mg C ha−1 year−1, 0.15–0.36 kg N ha−1 year−1, and 1.7–4.5 kg C ha−1 year−1, respectively. A clear exponential correlation was found between soil temperature and CO2 emission, but a negative linear correlation was found between soil water content and CO2 emission. Soil temperature had a significantly positive effect on CH4 uptake and N2O emission, whereas no significant correlation was found between CH4 uptake and soil water content, and N2O emission and soil water content. These results implied that older forest stands might cause more GHG emissions from the soil into the atmosphere because of higher litter/root biomass and soil carbon/nitrogen content compared with younger stands.