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- Title
电子受体添加对黄河口湿地土壤厌氧碳 矿化温度敏感性的影响.
- Authors
张佳彭; 杨继松; 刘 玥; 宁 凯; 于君宝; 王志康; 王雪宏
- Abstract
The temperature sensitivity of soil carbon mineralization (Q) is an important index to evaluate the responses of ecosystem carbon cycling to climate change. We examined the effects of three electron acceptors [SO42-, NO3- and Fe (皿)] addition on the Q⑴ value of anaerobic carbon mineralization of Phragmites australis community soil (0-10 cm) in the Yellow River Estuary wetland with the closed culture-gas chromatography method. The results showed that the three electron acceptors addition inhibited the production of CO2 and CH4 during the 48-day culture period, with a decrease of 17.3%-20.8% for CO2 and 29.2%-36.2% for CH4. Generally, the CO2 production differed with the concentrations of electron acceptors, while CH4 production differed with the type of electron acceptors. The CO2:CH4 ratios were significantly different with temperature, indicating an obvious temperature dependence for the anaerobic carbon mineralization pathway. The Q10 values of CO2 and CH4 production under three electron acceptor additions ranged from 1.08 to 1.11 and from 1.19 to 1.37, respectively, showing an increasing trend compared with the control. The type and concentration of electron acceptors affected the temperature dependence of CO2 production, while electron acceptors affected that of CH4 production. It is suggested that the input of reducing salts would retard the mineralization loss of organic carbon in estuary freshwater wetlands under the background of climate change, but enhance the sensitivity of carbon mineralization to increasing temperature.
- Subjects
ELECTROPHILES; WETLANDS; ESTUARIES; MINERALIZATION; CARBON
- Publication
Yingyong Shengtai Xuebao, 2023, Vol 34, Issue 11, p2985
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001--9332.202311.029