红壤丘陵景观表层土壤有机碳空间变异特点及其影响因子
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中国科学院知识创新工程项目(KZCX2-YW-423)、国家科技支撑计划项目(2008BADA7B01)共同资助


Spatial variations of organic carbon in surface soils in a hilly landscape of the red-earth region and their affecting factors
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    摘要:

    为探究景观尺度上土壤有机碳(SOC)空间格局与变异特点,选择典型红壤丘陵景观采样,分析表层SOC空间分布及其影响因子。结果显示红壤丘陵景观SOC平均含量为12.7 g kg-1,变异系数为31.3%,属于中等程度变异;SOC半方差模型为指数模型,具有强烈的空间自相关性(块金/基台值为6.3%);SOC空间分布呈现明显的条带状和斑块状格局,与景观单元内地形和土地利用方式高度一致。SOC含量随高程和坡度的增加而降低;四类利用方式下SOC含量顺序为水田(16.0 g kg-1)>旱地(11.2 g kg-1)> 果园(9.5 g kg-1)> 林地(8.4 g kg-1)。空间可视图显示利用方式对SOC含量的影响大于高程。研究表明利用方式和地形(高程和坡度)是亚热带典型红壤丘陵景观SOC空间变异的主要原因。

    Abstract:

    In aim to understand the spatial variations of soil organic C (SOC) in the landscape scale in the redearth region of China, data obtained from a hilly landscape unit selected from the region were analyzed using geography-statistical methodology. The overall mean and variation coefficient of SOC content in the surface layer (0~20 cm) were 12.7 g kg-1 and 31.3% for the landscape. The spatial distribution of SOC was highly self-correlated (nugget to sill was 6.3%) and land-use patterns in the landscape was strongly related (with a coefficient of 64.4%, p < 0.001) to topography factors (i.e. elevation and slope gradient), and its semi-variogram fitted well with an exponential model. The mean of SOC content for paddy soils in the landscape unit was 16.0 g kg-1, which was significantly larger than that for soils from arable lands (11.2 g kg-1), orchards (9.5 g kg-1), and woodlands (8.4 g kg-1). Surface visualization of SOC variations in the landscape unit demonstrates that the coefficient between SOC variations and landuse patterns was significantly larger that for SOC and elevation.

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唐国勇,黄道友,黄敏,吴金水.红壤丘陵景观表层土壤有机碳空间变异特点及其影响因子[J].土壤学报,2010,47(4):753-759. DOI:10.11766/trxb200807280422 Tang Guoyong, Huang Daoyou, Huang Min, Wu Jinshui. Spatial variations of organic carbon in surface soils in a hilly landscape of the red-earth region and their affecting factors[J]. Acta Pedologica Sinica,2010,47(4):753-759.

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