绥化市典型农田黑土有机碳变化特征

为了探究绥化市典型农田黑土有机碳的变化特征,对比分析了2002、2019年土壤有机碳含量,明确绥化市有机碳17年的时空变化特征。结果表明：2002年绥化市典型农田黑土的有机碳含量均值是22.02 g/kg,变异系数是22.57%,2019年的有机碳含量均值为21.67 g/kg,变异系数为22.47%,2002年和2019年有机碳含量均属于中等变异。只有望奎县和北林区的有机碳含量均值上升,其余市县的有机碳含量均值都是下降的。望奎县有机碳含量均值上升了2.96 g/kg,北林区有机碳含量均值提高了0.13 g/kg,兰西县有机碳含量下降了1.91 g/kg,绥棱县有机碳含量下降了1.72 g/kg,庆安县有机碳含量下降了 1.45 g/kg,青冈县有机碳含量下降了0.46 g/kg,海伦市有机碳含量下降了0.44 g/kg,明水县有机碳含量下降了0.32 g/kg。按照养分分级标准,2002年和2019年绥化市的有机碳含量均处于第三、四级水平,有机碳在空间上都是从两边向中间先降低再升高,从南向北逐渐升高的分布趋势。2002—2019年绥化市典型农田黑土有机碳含量是呈下降趋势的,有机碳17年的养分分级没有变化,绥化市整体的有机碳在空间上的分布趋势没有太大变化。

Variation Characteristics of Organic Carbon in Arable Black Soil in Suihua City

To explore the variation characteristics of organic carbon of arable black soil in Suihua City of Heilongjiang Province, the content of soil organic carbon in 2002 and 2019 were compared to clarify the temporal and spatial variation characteristics of organic carbon. The results showed that the average organic carbon content of arable black soil in Suihua City in 2002 was 22.02 g/kg, and the coefficient of variation was 22.57%. The average organic carbon content in 2019 was 21.67 g/kg, and the coefficient of variation was 22.47%. The organic carbon content in 2002 and 2019 belonged to medium variation. The average organic carbon content only increased in Wangkui County and Beilin District, by 2.96 g/kg and 0.13g/kg, respectively. The average organic carbon content in Lanxi County, Suiling County, Qing’an County, Qinggang County, Hailun City and Mingshui County decreased by 1.91, 1.72, 1.45, 0.46, 0.44 and 0.32 g/kg, respectively. According to the nutrient classification standard, the organic carbon content in Suihua was at the third and fourth level in 2002 and 2019. In view of the spatial variation, the organic carbon first decreased then increased from both sides to the middle and increased gradually from south to north. From 2002 to 2019, the organic carbon content of arable black soil in Suihua showed a downward trend, the nutrient classification of organic carbon did not change in the 17 years and the spatial distribution trend of organic carbon did not change significantly.