地学前缘 ›› 2009, Vol. 16 ›› Issue (1): 194-205.

• 论文 • 上一篇    下一篇

基于多目标区域地球化学调查的中国土壤碳储量计算方法研究

  

  1. 1中国地质调查局, 北京 100037
    2中国地质大学(北京) 地球科学与资源学院, 北京 100083

  • 出版日期:2009-02-02 发布日期:2009-02-02
  • 通讯作者: 夏学齐
  • 作者简介:奚小环(1949—),男,教授级高级工程师,地球化学专业,勘查地球化学学会副主任
  • 基金资助:

    中国地质调查局财政部专项“长江流域生态地球化学评价”(基［2008］GZTR02-01)

Calculation techniques for soil carbon storage of China based on multipurpose geochemical survey

  1. 1China Geology Survey, Beijing 100037, China
    2School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China

  • Online:2009-02-02 Published:2009-02-02

PDF (PC)

1025

摘要：

土壤碳储量问题在碳循环和全球变化领域具有重要意义,长期以来这一基本参数的计算受到数据来源的制约。全国多目标区域地球化学调查采用双层网格化采样和分析,取得了大量高密度和高精度土壤地球化学数据,为土壤碳库的高精度计算提供了数据基础。文中重点探讨利用这些数据计算土壤碳储量的方法。首先提出针对多目标区域地球化学调查数据的“单位土壤碳量(USCA)”概念,用以代表调查数据基本面积单元(4 km2)的碳储量,并作为区域和全国尺度土壤碳储量计算的基本单位。在收集分析14个省市414条的土壤剖面数据的基础上,发现土壤有机碳(TOC)的垂直分布与无机碳和其他元素不同,存在指数分布规律,运用面积积分运算方法发现利用直线模型计算土壤有机碳库的误差(+20％~+100％)远大于指数模型的误差(-10％~+20％)。因此,文中建议 “有机碳单位土壤碳量(USCATOC)”需使用指数模型拟合后积分求算,而 “无机碳单位土壤碳量(USCATIC)”则使用直线模型, “全碳单位土壤碳量(USCATC)”采用两者加和计算。文中还分析了其他元素的垂直分布特征,并提出氮储量计算需采用与有机碳类似的方法,其他51种元素(氧化物)储量采用与无机碳类似的方案,按照直线模型计算单位土壤元素量和单位土壤氧化物量(USEA)。

关键词: 多目标区域地球化学调查;土壤剖面;指数模型;单位土壤碳量

Abstract:

Abstract:  Soil carbon storage is an important parameter for the study of carbon cycling and global change. Accurate calculation of this parameter is limited by data sources for a long time. Multipurpose geochemical survey, using a scheme of grid sampling and analyses from double layers (surface and deep layer), provides large quantities of precise soil geochemical data for soil carbon storage of China. This paper aims at developing a soil carbon storage calculation method to be used as the criterion for China Geological Survey. A concept of “Unit Soil Carbon Amount  (USCA)”, defined as the amount (weight) of carbon storage in the unit area (4 km2) of multipurpose geochemical survey, was put forward as the basic unit to be cumulated for the calculation of soil carbon storage of a region or the whole China. On the basis of 414 soil profiles from 14 provinces, it was found that soil organic carbon (TOC), differing from soil inorganic carbon and other elements, has a trend of exponentially decreasing with depth. Integral analysis of exponential curve contrasting with the linear model affords the uncertainties of linear model and exponential model for carbon storage calculation. It was found that the integration of TOC with the linear model has errors between +20% to +100%, much higher than that of the exponential model (-10% to +20%). So, it was suggested that the “Unit Soil Organic Carbon Amount (USCATOC)” should be calculated by exponentially integrating TOC between the surface and deep soil layer. However, the “Unit Soil Inorganic Carbon Amount (USCATIC)” may be calculated by linear model. The “Unit Soil Total Carbon Amount (USCATC)” is the sum of the “Unit Soil Organic Carbon Amount” and the “Unit Soil Inorganic Carbon Amount”. It was also suggested that the soil nitrogen storage should be calculated by the scheme of exponential model similar to the organic carbon and that the “Unit Soil Element Amount (USEA)” for all the other elements may be calculated by linear model like the inorganic carbon.

Key words:

Key words: multipurpose geochemical survey; soil profile; exponential model; Unit Soil Carbon Amount

中图分类号: