再灌溉旱田土壤 N2O 排放中的分区反硝化途径

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-08-22 DOI:10.1007/s10533-024-01164-w
Yijia Tang, Budiman Minasny, Alex McBratney
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引用次数: 0

摘要

在被水淹没的稻田中,人们普遍认识到,干燥的土壤复湿后,温室气体一氧化二氮(N2O)的排放量会达到峰值。然而,生物和非生物因素对这一排放的相对贡献仍不确定。在本研究中,我们在缺氧培养实验中使用同位素技术(δ18O 和 δ15NSP)和基于分子的微生物分析来评估细菌、真菌和化学反硝化作用对一氧化二氮排放的贡献。我们在中国南方收集了八种具有代表性的水稻土进行培养实验。结果表明,在为期 10 天的培养期内,N2O 净排放量主要由真菌反硝化作用产生,在所调查的 8 块水稻田土壤中,有 6 块土壤的真菌反硝化作用占 58-77%。相比之下,细菌反硝化作用占 N2O 净排放量的 6-15%。此外,在所有类型的土壤中,约 11%-35% 的 N2O 排放量来自化学反硝化作用。变分分析(VPA)和主成分分析(PCA)表明,初始土壤有机碳(OC)浓度是 N2O 来源模式的主要调节因素。有机碳浓度相对较低(7-15 毫克/克)的土壤往往以真菌反硝化作用为主,这也是培养期结束时净 N2O 产生的主要原因。总之,这些研究结果突出表明,真菌反硝化作用是淹水稻田土壤产生 N2O 的主要途径,在 OC 含量相对较低的土壤中占主导地位。这表明,在优化农业管理系统的时间安排以控制水淹稻田土壤生态系统中的一氧化二氮排放时,以及在未来建立相关预测数值模型时,应考虑真菌的贡献。
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Partitioning denitrification pathways in N2O emissions from re-flooded dry paddy soils

In flooded paddy fields, peak greenhouse gas nitrous oxide (N2O) emission after rewetting the dry soils is widely recognised. However, the relative contribution of biotic and abiotic factors to this emission remains uncertain. In this study, we used the isotope technique (δ18O and δ15NSP) and molecular-based microbial analysis in an anoxic incubation experiment to evaluate the contributions of bacterial, fungal, and chemical denitrification to N2O emissions. We collected eight representative paddy soils across southern China for an incubation experiment. Results show that during the 10-day incubation period, the net N2O emissions were mainly produced by fungal denitrification, which accounted for 58–77% in six of the eight investigated flooded paddy soils. In contrast, bacterial denitrification contributed 6–15% of the net N2O emissions. Moreover, around 11–35% of the total N2O emissions were derived from chemical denitrification in all soil types. Variation partitioning analysis (VPA) and principal component analysis (PCA) demonstrated that initial soil organic carbon (OC) concentrations were the primary regulator of N2O source patterns. Soils with relatively lower OC concentration (7–15 mg g−1) tend to be dominated by fungal denitrification, which accounted for the net N2O production at the end of the incubation period. Overall, these findings highlight the dominance of the fungal denitrification pathway for N2O production in flooded paddy soils, which predominates in soils with relatively lower OC content. This suggests that fungal contribution should be considered when optimizing agricultural management system timing to control N2O emissions in flooded paddy soil ecosystems, and for the relevant establishment of predictive numerical models in the future.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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