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首页> 外文期刊>Environmental earth sciences >Modified method for estimating the organic carbon density of discontinuous soils in peak-karst regions in southwest China
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Modified method for estimating the organic carbon density of discontinuous soils in peak-karst regions in southwest China

机译：西南峰岩溶区间断土壤有机碳密度估算的改进方法

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摘要

Precise estimation of soil organic carbon storage is essential to assess carbon sequestration in soils at a regional scale. However, there is great uncertainty regarding such estimations for discontinuous soils, especially in peak-karst regions where soil is distributed between horizontal cracks and vertical fissures. In this study, a modified method was developed to estimate the soil organic carbon density (SOCD) in peak-karst regions in southwest China, and four typical sites were selected to evaluate this methodology. Compared with the conventional method, additional soil distribution characters, such as the average depth and the proportions of the ground surface area represented by continuous soil, soil in cracks and fissures, soil on rocks, and rocky soil, were considered in the estimation. The SOCD under each vegetation type was calculated by totaling the SOCD values for the various types of soil surfaces, and the SOCD for a site was then totaled using the weighted mean method based on vegetation. Using the modified method, the SOCD values were estimated for the four typical sites selected. The estimation results demonstrated that the SOCD values for the karst sites (6.39,7.52, and 9.22 kg m~2) were lower than that for the red soil site (10.01 kg m~2). The SOCD values estimated for the karst sites using the proposed method ranged from 24.3 to 89.6% of the estimates obtained using the conventional method, reflecting previous overes-timations. The differences in the estimated SOCD values were mainly due to soil distribution characters.
机译：精确估算土壤有机碳储量对于评估区域规模的土壤固碳至关重要。但是，对于这种不连续土壤的估算存在很大的不确定性，特别是在峰值分布在水平裂缝和垂直裂缝之间的喀斯特峰地区。在这项研究中，开发了一种改进的方法来估算中国西南峰喀斯特地区的土壤有机碳密度（SOCD），并选择了四个典型的地点来评估该方法。与常规方法相比，估算中还考虑了其​​他土壤分布特征，例如平均深度和以连续土壤表示的地表比例，裂缝和裂缝中的土壤，岩石上的土壤以及岩石土壤。通过将各种类型的土壤表面的SOCD值相加来计算每种植被类型下的SOCD，然后使用基于植被的加权平均法对某个地点的SOCD进行总计。使用修改后的方法，为选定的四个典型站点估算了SOCD值。估算结果表明，喀斯特地貌的SOCD值（6.39、7.52和9.22 kg m〜2）低于红壤地貌的（10.01 kg m〜2）。使用所提出的方法估算的喀斯特地貌的SOCD值范围是使用传统方法估算的SOCD值的24.3％至89.6％，这反映了以前的过度估计。 SOCD估算值的差异主要归因于土壤分布特征。

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  • 来源
    《Environmental earth sciences》 |2012年第6期|p.1743-1755|共13页
  • 作者

    Hua Zheng; Yirong Su; Xunyang He; Lening Hu; Jinshui Wu; Daoyou Huang; Lei Li; Cixian Zhao;

  • 作者单位

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Graduate School of Chinese Academy of Sciences, Beijing 100039, China,Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Graduate School of Chinese Academy of Sciences, Beijing 100039, China,Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Graduate School of Chinese Academy of Sciences, Beijing 100039, China;

    Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China,Graduate School of Chinese Academy of Sciences, Beijing 100039, China,Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, China;

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  • 正文语种 eng
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  • 关键词

    soil organic carbon density; estimation; method; peak-karst; discontinuous soil;

    机译：土壤有机碳密度;估计方法;岩溶峰不连续土壤;

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