彭州市新黄村地震灾后土壤有机碳含量分布特征及影响因素

Distribution Characteristics and Influencing Factors of Soil Organic Carbon Content After Earthquake in New Huang Village of Pengzhou City

以典型地震灾区彭州市新黄村为研究对象,应用地统计学和GIS相结合的方法,分析了该区土壤有机C含量分布特征及其影响因素。结果表明,该区域内表层土壤有机C含量为24.83g/kg,其空间分布呈带状,自西部高值区(>31g/kg)向东部低值区(<13g/kg)递减;不同土地利用方式典型土壤剖面有机C含量总体趋势是随深度的增加而减少,水田、旱地土壤0～20cm有机C含量最高,荒地土壤20～40cm有机C含量最高。影响因素分析表明,不同土地利用方式中水田有机C含量极显著高于荒地,旱地显著高于荒地,水田和旱地差异不显著;地震及震后人类活动能改变土壤有机C含量。

In this paper, the distribution characteristics and its influencing factors of soil organic carbon （SOC） after earthquake in New Huang Village of Pengzhou City were studied by geostatistics and GIS methods. Results showed that SOC content of the surface layer in this region was 24.83 g/kg, and its spatial distribution was belt-shaped, SOC content descended from 〉31 g/kg in the west area to 〈 13 g/kg in the east area. SOC contents of typical soil profiles under different land use patterns decreased generally with the increase of soil depth. Highest SOC contents appeared in 0 - 20 cm layer of paddy fields and dry lands and 20 -40 cm of wastelands. SOC contents of paddy fields were significantly higher than those of the wastelands, and SOC contents of dry lands were higher than those of the wastelands, but no significant difference existed between SOC contents of dry lands and wastelands. Earthquake and the succedent human activities could change SOC content.