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1981—2010年内蒙古草地土壤有机碳时空变化及其气候敏感性

郭灵辉 高江波 吴绍洪 郝成元 赵东升

郭灵辉, 高江波, 吴绍洪, 郝成元, 赵东升. 1981—2010年内蒙古草地土壤有机碳时空变化及其气候敏感性[J]. 环境科学研究, 2016, 29(7): 1050-1058.
引用本文: 郭灵辉, 高江波, 吴绍洪, 郝成元, 赵东升. 1981—2010年内蒙古草地土壤有机碳时空变化及其气候敏感性[J]. 环境科学研究, 2016, 29(7): 1050-1058.
GUO Linghui, GAO Jiangbo, WU Shaohong, HAO Chengyuan, ZHAO Dongsheng. Spatial-Temporal Change of Soil Organic Carbon and Its Susceptibility to Climate Change in Inner Mongolia Grassland during 1981-2010[J]. Research of Environmental Sciences, 2016, 29(7): 1050-1058.
Citation: GUO Linghui, GAO Jiangbo, WU Shaohong, HAO Chengyuan, ZHAO Dongsheng. Spatial-Temporal Change of Soil Organic Carbon and Its Susceptibility to Climate Change in Inner Mongolia Grassland during 1981-2010[J]. Research of Environmental Sciences, 2016, 29(7): 1050-1058.

1981—2010年内蒙古草地土壤有机碳时空变化及其气候敏感性

基金项目: 国家科技支撑计划项目(2012BAC19B04,2012BAC19B10);国家重点基础研究发展计划(973)项目(2011CB403206)

Spatial-Temporal Change of Soil Organic Carbon and Its Susceptibility to Climate Change in Inner Mongolia Grassland during 1981-2010

  • 摘要: 草地土壤有机碳储量巨大,其较小幅度的波动即可能显著反馈于气候变化. 基于1981—2010年内蒙古自治区境内及其周边共计92个气象台站气候要素插值数据,采用空间化的生物地球化学模型——CENTURY 4.5,模拟分析近30年来内蒙古草地表层(0~20 cm)土壤有机碳的空间格局与动态变化特征,并通过构建气候变化情景探讨其对主要气候要素的敏感性. 结果表明:近30年内蒙古草地表层土壤有机碳密度平均值约为1.99 kg/m2(以C计),在空间上呈由东北向西南逐渐减少的分布特征. 近30年来内蒙古草地表层土壤有机碳密度略有增加,年均增幅约0.22%,其中草甸草原的增速〔14.25 g/(m2·a)〕最大,荒漠草原的增速〔1.36 g/(m2·a)〕最小. 草地表层土壤有机碳密度年际变化差异明显,1980s至1990s的增加较为缓慢,1990s至2000s的增幅约为前者的2倍,其中草甸草原和典型草原土壤有机碳增幅较大. 气候敏感性分析结果显示,区域降水量变化可能是近30年内蒙古草地表层土壤有机碳密度变化的主要影响因素,但不同草地类型表层土壤有机碳密度对气候变化的敏感性存在较大差异;典型草原与草甸草原表层土壤有机碳变化主要受控于降水量变化,荒漠草原则主要受控于温度变化.

     

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