寒温带针叶林土壤CH_4吸收对模拟大气氮沉降增加的初期响应
Early responses of soil CH_4 uptake to increased atmospheric nitrogen deposition in a cold-temperate coniferous forest
查看参考文献39篇
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文摘
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土壤甲烷(CH_4)吸收是森林生态系统碳循环的重要环节,研究大气氮(N)沉降增加情景下北方森林土壤CH_4吸收通量及其驱动机制至关重要。以大兴安岭寒温带针叶林作为研究对象,构建了低剂量、多形态的增N控制实验,研究了2010年生长季(6-10月)土壤CH_4吸收通量对增N的初期响应及其环境驱动机制。结果表明:整个生长季,寒温带针叶林土壤表现为大气CH_4的汇,土壤CH_4平均吸收通量为(51.5±4.7) μg m~(-2)h~(-1),主要由0-10 cm层土壤水分驱动。除了低剂量的NO_3~--N输入促进了土壤CH_4氧化外,低剂量的N输入总体上没有显著改变寒温带针叶林土壤CH_4净吸收通量。另外,增N没有显著改变0-10 cm层土壤水分、温度和土壤pH值,但显著增加了0-10cm矿质土壤NH_4~+-N和NO_3~--N含量。研究表明,受N限制的北方森林土壤CH_4吸收对增N响应的敏感程度与土壤CH_4活性氧化区域、土壤NH_4~+-N和NO_3~--N含量的空间分布格局以及相对比例有关。在分析北方森林土壤CH_4通量及其驱动因子对N沉降增加的响应时,除要考虑N沉降水平影响外,还应考虑N沉降类型(NH_4~+-N和NO_3~--N)的相对影响。 |
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其他语种文摘
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Methane (CH_4) oxidation in boreal forest soils is an important factor in the global CH_4 budget. Previous studies have shown that nitrogen (N) deposition alters the magnitude and direction of CH_4 uptake in boreal forest soils. However, the critical rate of atmospheric N deposition that causes the shift from stimulation of soil CH_4 uptake to inhibition, and the mechanisms responsible for these trends, are poorly understood. Investigation into the responses of CH_4 uptake flux from these soils and its driving factors relating to N input is important. In this study, a cold-temperate coniferous forest in the Great Xing'an Mountains was selected for conducting an N addition manipulative experiment. Two forms of N (NH_4~+-N and NO_3~--N) and three N addition rates (0, 10 and 40 kg N hm~(-2) a~(-1)) were designed to assess the responses of soil CH_4 fluxes to N addition. In the growing season (June to September) of 2010, soil atmospheric CH_4 exchange flux was measured every ten days using closed clambers. Simultaneously, soil environmental variables including soil moisture, soil temperature in the 0-10 cm horizon, soil NH_4~+-N and NO_3~--N contents in the organic and mineral horizons, and soil pH values in the mineral soil horizon were also measured to determine the main factors affecting soil CH_4 uptake. The results showed that the average rate of CH_4 uptake in the cold-temperate coniferous forest soil was (51.5±4.70) μg m~(-2) h~(-1), and this was mainly controlled by soil moisture content at 0-10 cm. Although N input did not significantly affect the soil CH_4 uptake, low level NO_3~--N input did slightly stimulate soil CH_4 uptake. Further analysis revealed that soil moisture and soil temperature at 0-10 cm were not affected by N input. Soil NH_4~+-N and NO_3~--N contents decreased greatly with soil depth and the vertical distribution pattern was obvious. In the organic layer, soil NH_4~+-N content increased with increasing N input, whereas soil NO_3~--N content was not affected by N addition. In the mineral layer, soil NH_4~+-N contents in the upper 10 cm were significantly affected by the levels and forms of N input, but soil NO_3~--N contents in the same soil horizon were only sensitive to NO_3~--N fertilizer addition. However, no significant changes in the soil pH at 0-10 cm were found among different N addition treatments. These results, to some degree, suggested that the sensitivity of CH_4 uptake from the N limited boreal soils in response to N input might be closely associated with the active CH_4 oxidizing zone and the vertical distribution and relative proportions of soil NH_4~+-N and NO_3~--N. Whether chronic atmospheric N deposition will alter the trends in soil CH_4 uptake in cold-temperate coniferous forests remains uncertain and needs to be further investigated. In addition, during the analysis of the responses of CH_4 uptake to N deposition from the N limited boreal soils and its control factors, both the levels and forms of N deposition should be taken into account. |
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来源
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生态学报
,2013,33(23):7505-7515 【核心库】
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DOI
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10.5846/stxb201208251200
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关键词
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CH_4吸收
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大气N沉降
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土壤无机N
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初期响应
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北方森林
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地址
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1.
中国科学院地理科学与资源研究所, 中国科学院生态系统观测与模拟重点实验室, 北京, 100101
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中国科学院大学, 北京, 100049
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东华大学环境科学与工程学院, 上海, 201620
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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基金
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国家自然科学基金资助项目
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国家973计划
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中国科学院地理与资源研究所“秉维”优秀青年人才基金资助项目
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中国科学院战略性先导科技专项
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文献收藏号
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CSCD:5021711
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