芦苇凋落物输入和淹水对湿地土壤有机碳矿化的影响
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摘要
为探讨凋落物输入对湿地土壤有机碳矿化的影响,以衡水湖地区典型芦苇沼泽湿地土壤为研究对象,采用室内培养实验(20℃,28 d),研究了在芦苇凋落物6种输入水平(0.00、0.25、0.50、0.75、1.00、1.25mg/g)以及淹水和非淹水条件下的土壤有机碳矿化速率。结果表明:衡水湖湿地土壤有机碳矿化速率在芦苇凋落物不同输入水平间存在显著差异(P<0.05)。培养28 d后,累积土壤有机碳矿化量与凋落物输入量存在显著正相关关系(r~2=0.89),在1.25mg/g凋落物输入水平下累积土壤有机碳矿化量比无凋落物输入处理增高35.1%。凋落物添加与淹水处理对土壤有机碳矿化的交互作用不显著,在淹水与非淹水条件下芦苇凋落物添加促进了湿地土壤有机碳矿化过程。
Wetlands play an important role in global carbon cycling, because they only cover a small proportion of the earth's land surface but contain a large proportion of the world's soil carbon. Such disproportionate soil carbon storage in wetlands is generally contributed by the anoxic wet conditions which impeding decomposition of organic matter. Accumulation of soil organic carbon pool ultimately depends on the imbalance between fresh organic carbon inputs and old organic carbon mineralization. It has been widely proved that litter, the most important source for soil organic carbon, could prime soil organic carbon mineralization in forests, grasslands and croplands, but has not been well tested in wetlands. We conducted an incubation experiment to investigate wetland soil organic carbon mineralization under a gradient(0.00, 0.25, 0.50, 0.75, 1.00 and 1.25 mg/g) of Phragmites australis litter inputs, and in anoxic or aerobic conditions. Our results showed that significant differences existed in soil carbon mineralization rates under different litter inputs levels. After 28 d of incubation, accumulated carbon mineralization of soil amended with litter was substantially higher than that of soil only. There was a positive linear relationship between accumulated soil carbon mineralization and the amount of litter inputs with Pearson correlation coefficient r~2=0.89. Soil carbon mineralization rates of soil under flooding which leading to anoxic looding condition were significantly higher than that in soil in aerobic condition. The interactive effects of litter inputs and flooding on soil carbon mineralization rates were insignificant. Our study provided evidence that litter inputs could accelerate wetland soil carbon mineralization in both anoxic and aerobic conditions.
Wetlands play an important role in global carbon cycling, because they only cover a small proportion of the earth's land surface but contain a large proportion of the world's soil carbon. Such disproportionate soil carbon storage in wetlands is generally contributed by the anoxic wet conditions which impeding decomposition of organic matter. Accumulation of soil organic carbon pool ultimately depends on the imbalance between fresh organic carbon inputs and old organic carbon mineralization. It has been widely proved that litter, the most important source for soil organic carbon, could prime soil organic carbon mineralization in forests, grasslands and croplands, but has not been well tested in wetlands. We conducted an incubation experiment to investigate wetland soil organic carbon mineralization under a gradient(0.00, 0.25, 0.50, 0.75, 1.00 and 1.25 mg/g) of Phragmites australis litter inputs, and in anoxic or aerobic conditions. Our results showed that significant differences existed in soil carbon mineralization rates under different litter inputs levels. After 28 d of incubation, accumulated carbon mineralization of soil amended with litter was substantially higher than that of soil only. There was a positive linear relationship between accumulated soil carbon mineralization and the amount of litter inputs with Pearson correlation coefficient r~2=0.89. Soil carbon mineralization rates of soil under flooding which leading to anoxic looding condition were significantly higher than that in soil in aerobic condition. The interactive effects of litter inputs and flooding on soil carbon mineralization rates were insignificant. Our study provided evidence that litter inputs could accelerate wetland soil carbon mineralization in both anoxic and aerobic conditions.
引文
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王嫒华,苏以荣,李杨,等.2011.稻草还田条件下水田和旱地土壤有机碳矿化特征与差异[J].土壤学报,48(5):979-987
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张林海,曾从盛,仝川.2011.生源要素有效性及生物因子对湿地土壤碳矿化的影响[J].生态学报,31(18):5387-5395
张曼胤,崔丽娟,盛连喜,等.2007.衡水湖湿地底泥重金属污染及潜在生态风险评价[J].湿地科学,5(4):362-369
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Aerts R.1997.Climate,leaf litter chemistry and leaf litter decomposition in terrestrial ecosystems:A triangular relationship[J].Oikos,79(3):439-449
BlagodatskayaЕ,Kuzyakov Y.2008.Mechanisms of real and apparent priming effects and their dependence on soil microbial biomass and community structure:critical review[J].Biology&Fertility of Soils,45(2):115-131
Guenet B,Danger M,Harrault L,et al.2014.Fast mineralization of land-born C in inland waters:first experimental evidences of aquatic priming effect[J].Hydrobiologia,721(1):35-44
Kayranli B,Scholz M,Mustafa A,et al.2010.Carbon Storage and Fluxes within Freshwater Wetlands:a Critical Review[J].Wetlands,30(1):111-124
Kuzyakov Y.2010.Priming effects:interactions between living and dead organic matter[J].Soil Biology&Biochemistry,42(9):1363-1371
Marín-SpiottaE,Gruley K E,Crawford J,et al.2014.Paradigm shifts in soil organic matter research affect interpretations of aquatic carbon cycling:transcending disciplinary and ecosystem boundaries[J].Biogeochemistry,117(2-3):279-297
Mitsch W J,Bernal B,Nahlik A M,et al.2013.Wetlands,carbon,and climate change[J].Landscape Ecology,28(4):583-597
黎聪,李晓文,郑钰,等.2008.衡水湖国家级自然保护区湿地
景观格局演变分析[J].资源科学,30(10):1571-1578
廖畅,田秋香,汪东亚,等.2016.外源碳输入对中亚热带森林深层土壤碳矿化和微生物决策群落的影响[J].应用生态学报,27(9):2848-2854
刘德燕,宋长春,王丽,等.2008.外源氮输入对湿地土壤有机碳矿化及可溶性有机碳的影响[J].环境科学,29(12):3525-3530
史学军,潘剑君,陈锦盈,等.2009.不同类型凋落物对土壤有机碳矿化的影响[J].环境科学,30(6):1832-1837
王丹,吕瑜良,徐丽等.2013.水分和温度对若尔盖湿地和草甸土壤碳矿化的影响[J].生态学报,33(20):6436-6443
王若梦,董宽虎,何念鹏,等.2013.围封对内蒙古大针茅草地土壤碳矿化及其激发效应的影响[J].生态学报,33(12):3622-3629
王晓峰,汪思龙,张伟东.2013.杉木凋落物对土壤有机碳分解及微生物生物量碳的影响[J].应用生态学报,4(9):2393-2398
王嫒华,苏以荣,李杨,等.2011.稻草还田条件下水田和旱地土壤有机碳矿化特征与差异[J].土壤学报,48(5):979-987
杨钙仁,童成立,张文菊,等.2005.陆地碳循环中的微生物分解作用及其影响因素[J].土壤通报,6(4):605-609
杨继松,刘景双,孙丽娜.2008.温度、水分对湿地土壤有机碳矿化的影响[J].生态学杂志,27(1):38-42
袁淑芬,汪思龙,张伟东.2015.外源有机碳和温度对土壤有机碳分解的影响[J].土壤通报,46(4):916-922
张林海,曾从盛,仝川.2011.生源要素有效性及生物因子对湿地土壤碳矿化的影响[J].生态学报,31(18):5387-5395
张曼胤,崔丽娟,盛连喜,等.2007.衡水湖湿地底泥重金属污染及潜在生态风险评价[J].湿地科学,5(4):362-369
张文菊,童成立,杨钙仁,等.2005.水分对湿地沉积物有机碳矿化的影响[J].生态学报,25(2):249-253
Aerts R.1997.Climate,leaf litter chemistry and leaf litter decomposition in terrestrial ecosystems:A triangular relationship[J].Oikos,79(3):439-449
BlagodatskayaЕ,Kuzyakov Y.2008.Mechanisms of real and apparent priming effects and their dependence on soil microbial biomass and community structure:critical review[J].Biology&Fertility of Soils,45(2):115-131
Guenet B,Danger M,Harrault L,et al.2014.Fast mineralization of land-born C in inland waters:first experimental evidences of aquatic priming effect[J].Hydrobiologia,721(1):35-44
Kayranli B,Scholz M,Mustafa A,et al.2010.Carbon Storage and Fluxes within Freshwater Wetlands:a Critical Review[J].Wetlands,30(1):111-124
Kuzyakov Y.2010.Priming effects:interactions between living and dead organic matter[J].Soil Biology&Biochemistry,42(9):1363-1371
Marín-SpiottaE,Gruley K E,Crawford J,et al.2014.Paradigm shifts in soil organic matter research affect interpretations of aquatic carbon cycling:transcending disciplinary and ecosystem boundaries[J].Biogeochemistry,117(2-3):279-297
Mitsch W J,Bernal B,Nahlik A M,et al.2013.Wetlands,carbon,and climate change[J].Landscape Ecology,28(4):583-597
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