山西省土壤湿度时空分布及与气候因素的耦合

Spatio-temporal Distribution of Soil Humidity and the Coupling to Climate Factors in Shanxi, China

为了解山西省土壤湿度状况变化规律,进而为农业旱情监测提供科学依据。利用2017年3月到2018年2月山西省土壤湿度数据、降水量数据和气温数据,通过趋势分析和相关分析等方法研究山西省土壤湿度的时空变化以及土壤湿度对气候变化的响应。结果表明:山西省的平均土壤湿度分布特征为南高北低,东高西低,呈现出东南向西北递减的趋势;在季际-月际时间尺度分布下,土壤湿度在秋季达到高峰,且各区域表层土壤湿度与空气温度有着显著的负相关关系,而与降水量有着显著的正相关关系。可见山西省农业旱情受到区域地形、温度和降水等多方面因素的影响。

To understand the variation of soil moisture in Shanxi Province, NW China and provide a scientific basis for agricultural drought monitoring, data of soil moisture, precipitation, and temperature in Shanxi Province from March 2017 to February 2018 were analyzed, and the coupling relationship between soil moisture and climatic factor was deciphered by the method of trend and correlation analyses. Results show that the average soil moisture distribution was characterized by being high in the south and east and low in the north and west of the province. It has a downward trend from southeast to northwest. The precipitation and temperature peaked in summer, while soil moisture peaked in autumn. The seasonal and monthly distributions presented a significant positive correlation between surface soil moisture and precipitation, and a significant negative correlation between them. Therefore, the agricultural drought in Shanxi Province is affected by many factors, such as regional topography, temperature, and precipitation.