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利用1981—2010年黑龙江省土壤湿度数据,以富锦县、龙江县、双城县、黑河市、海伦县和宁安县为代表站点,分析黑龙江省东、西、南、北部和中部及牡丹江半山区各区域夏季(7—8月)0—50 cm土层土壤湿度的趋势变化和干湿变化,并采用Mann-Kendall法对土壤湿度变化趋势进行显著性和突变点检验。结果表明:夏季0—50 cm土层,黑河市、海伦县和龙江县土壤湿度在30 a间均有不同程度下降,尤其是西部的龙江县土壤湿度下降剧烈;而东部富锦县、南部的双城县和牡丹江半山区的宁安县土壤湿度无明显下降趋势。Mann-Kendall检验结果:近30 a中,黑龙江省夏季0—50 cm土层北部、西部和中部的黑河市、龙江县及海伦县土壤湿度下降趋势显著,并出现了突变区域,表明黑河地区、松嫩平原的西部和北部夏季土壤湿度的干旱化趋势和程度均越来越明显。黑龙江省中西部夏季土壤湿度年际间的下降可能与气候条件及土壤理化性质的改变等因素密切相关。
Based on the data of soil moisture in Heilongjiang Province from 1981 to 2010 and the representative sites in Fujin County, Longjiang County, Shuangcheng County, Heihe City, Helena County and Ning’an County, the author analyzes the East, West, South, North and Central of Heilongjiang Province and Mudanjiang The trend of soil moisture in 0-50 cm soil layer in summer (July-August) and the change of wet-dry in each area of the mid-mountainous area were tested. The Mann-Kendall method was used to test the change of soil moisture. The results showed that soil moisture in 0-50 cm layer, Heihe, Helen and Longjiang counties in summer dropped to different degrees in 30 years, especially in Longjiang County in western China. However, Soil moisture in Ning’an County in Shuangcheng County in the south and Mianjiang Mountain in Mudanjiang River had no obvious decreasing trend. Mann-Kendall Test Results: In the recent 30 years, the soil moisture in the Hexi, Longjiang and Helen counties in the north, west and central China in the 0-50 cm soil layer of summer in Heilongjiang Province showed a significant trend of decline with the emergence of a mutation area, indicating that the Heihe area The trend and extent of summer soil moisture in the western and northern Songnen Plain are more and more obvious. The decline of summer soil moisture in central and western Heilongjiang Province may be closely related to the climatic conditions and the change of soil physical and chemical properties.