Dissolved organic matter and inorganic N jointly regulate greenhouse gases fluxes from forest soils with different moistures during a freeze-thaw period
Dissolved organic matter and inorganic N jointly regulate greenhouse gases fluxes from forest soils with different moistures during a freeze-thaw period
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冻融期不同湿度森林土壤溶解有机质和无机氮共同调节温室气体通量
DOI：
10.1080/00380768.2019.1667212
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发表时间：
2020-01
影响因子：
2
通讯作者：
Han Li
中科院分区：
文献类型：
--
作者：
Wu Haohao;Xu Xingkai;Cheng Weiguo;Han Li
摘要冻前土壤湿度会影响土壤解冻过程中温室气体(GHG)的排放，但其临界阈值及其作用机制尚不清楚。通过填充土芯培养实验，研究了成熟阔叶林和红松混交林土壤及其邻近的白桦林土壤在−8°C冻结2个月和10℃解冻10天过程中的一氧化二氮(N2O)、二氧化碳(CO2)和甲烷(CH4)通量。在冻融期，两种土壤吸收CH4的土壤水分阈值为50-70%，N2O和CO2排放的阈值为70%-90%。在最佳土壤水分条件下，生物有效性高的富里酸类化合物贡献了土壤中60%以上的溶解有机质(DOM)。当土壤中硝态氮与溶解有机碳的浓度比为0.04g N g−1时，冻融期森林土壤N2O的累积排放量最大。β-1，4-葡萄糖苷酶和β-1，4-N-乙酰氨基葡萄糖苷酶的活性、微生物量C和N以及微生物量C/N比均与土壤N_2O、CO_2和CH_4通量显著相关。总体而言，在不同土壤湿度的冻融期，森林土壤的温室气体通量受到无机N和DOC浓度的共同调节，并与释放到土壤中的DOM的不稳定组分有关，这可以受到相关微生物特性的严格控制。
ABSTRACT Antecedent soil moisture before freezing can affect greenhouse gases (GHG) fluxes from soils during thaw, but their critical threshold values for GHG fluxes and the underlying mechanisms are still not clear. By using packed soil-core incubation experiments, we have studied nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) fluxes from a mature broadleaf and Korean pine-mixed forest soil and an adjacent white birch forest soil with nine levels of soil moisture ranging from 10 to 90% water-filled pore space (WFPS) during a 2-month freezing at −8°C and the following 10-day thaw at 10°C. The threshold values of soil moisture ranged from 50 to 70% WFPS for CH4 uptake and from 70 to 90% WFPS for N2O and CO2 emissions from the two soils during the freeze-thaw period. Under the optimum soil moisture condition, fulvic-like compounds with high bioavailability contributed more than 60% of dissolved organic matter (DOM) in the soil. Cumulative N2O emissions from forest soils during the freeze-thaw period were greatest when the concentration ratio of nitrate-N to dissolved organic carbon (DOC) was 0.04 g N g−1 C. Cumulative soil CO2 emissions and CH4 uptake during the freeze-thaw period were both regulated by the interaction between soil DOC and net N mineralization. The activities of β-1,4-glucosidase and β-1,4-N-acetyl-glucosaminidase, microbial biomass C and N, and the microbial biomass C-to-N ratios, were all significantly correlated to the soil N2O, CO2, and CH4 fluxes. Overall, upon a freeze-thaw period with different soil moistures, GHG fluxes from forest soils were jointly regulated by inorganic N and DOC concentrations, and related to the labile components of DOM released into the soil, which could be strictly controlled by the related microbial properties.
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影响因子：
6.1
作者：
Xingkai Xu;Xianbao Luo
通讯作者：
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影响因子：
5.2
作者：
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影响因子：
1.7
作者：
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影响因子：
2.2
作者：
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通讯作者：
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影响因子：
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作者：
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