| 张尹,于志国,张乐,陈袁波,黄婷,胡颖.厌氧条件下环境因子对泥炭土壤温室气体排放的影响研究[J].农业环境科学学报,2019,38(6):1388-1397. |
| 厌氧条件下环境因子对泥炭土壤温室气体排放的影响研究 |
| Impact of environmental factors on greenhouse gas emissions from peat soil under anaerobic conditions |
| 投稿时间：2018-09-17 |
| DOI：10.11654/jaes.2018-1188 |
| 中文关键词: 泥炭沼泽 温室气体排放 气候变化 厌氧呼吸 |
| 英文关键词: northern peatland emission of greenhouse gases climate change anaerobic respiration |
| 基金项目:国家自然科学基金项目（41601090，41877337）；江苏省自然科学基金项目（BK20160950）；江苏省高校自然科学基金项目（16KJB170009） |
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| 中文摘要: |
| 为研究环境因子对寒温带泥炭土壤温室气体排放的影响，选取加拿大Mer Bleue泥炭沼泽的泥炭土壤为培养介质，利用室内微宇宙培养实验，分别以培养温度（5.4、13.1、20.1℃）、pH值（4、5、6、7）以及泥炭土底质（采样深度50、100、150、250 cm）为环境因子，探讨其对二氧化碳（CO2）和甲烷（CH4）排放的影响程度。结果表明，在不同环境因子处理组中CO2和CH4的初始产生速率范围分别为0.399~2.27 μmol·g-1 DW·d-1和0.018~0.180 μmol·g-1 DW·d-1，排放阈值范围分别为1.38~91.6 μmol·g-1 DW和1.12~9.02μmol·g-1 DW。温度越高，CO2和CH4的产生速率越快，且温度对CH4的影响比对CO2的影响更明显。pH值分别与CO2的初始产生速率和阈值呈显著正相关，而CH4的初始产生速率受pH值的影响不显著，在pH值为5~6时CH4排放阈值最大。对于采集深度不同的泥炭土，深度为50 cm处的CO2和CH4排放量最多，而深度为50 cm以下的气体排放量极低。研究表明，不同环境因子处理组表现出不同的初始产生速率和阈值，说明环境因素对天然泥炭地中相对稳定的碳储存存在较大影响。 |
| 英文摘要: |
| Peatlands are of great importance as carbon stores and are a critical source for releasing carbon dioxide (CO2) and methane (CH4) under changing circumstances, e.g., climate change. Although peatlands cover only 3% of the land and freshwater surface of the planet, about one-third of the total world soil carbon are stored in boreal and subarctic peat. Thus, investigating the influence of key factors on organic matter mineralization processes is urgently required for greater understanding of carbon cycling in northern peatland. In the current study, we employed incubation experiments to characterize the influence of temperature (5.4~20.1℃), pH value (4~7), and peat quality (50~250 cm) on CO2 and CH4 release from the water-saturated, anoxic layer in northern peatland. The results showed that the range of initial production rates of CO2 and CH4 for the different treatments were 0.399~2.27 μmol·g-1 DW·d-1 and 0.018~0.180 μmol·g-1 DW·d-1, respectively, and the range of thresholds were 1.38~91.6 μmol·g-1 DW and 1.12~9.02 μmol·g-1 DW, respectively. The initial production rates of CO2 and CH4 increased significantly with temperature, but the effect was greater on CH4. The pH value was positively correlated with the initial production rate and the threshold value of CO2, whereas the initial production rate of CH4 was not significantly affected by pH value, and the threshold of CH4 was high, at pH 5~6. For the peat soil sampled from different depths, the peat soil at a depth of 50 cm had the highest CO2 and CH4 emissions, whereas the peat from depths greater than 50 cm presumably did not produce any CO2 or CH4. The results indicate that environmental factors have great impacts on carbon storage in natural peatlands. |
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