吉林省春季土壤水分分布特征及影响因素分析

利用2003~2010年吉林省春季土壤含水率数据及相关数据,采用常规统计方法、地统计学方法和基于地理信息系统的空间分析方法,讨论吉林省春季土壤水分分布特征,并对其影响因素进行初步分析。结果表明,吉林省春季0~30 cm土壤平均含水率总体上呈由西向东逐渐增加的趋势,空间差异性显著,其中10 cm深度土壤含水率空间差异最大;土壤层之间的距离越近,土壤含水率的相关性越好,东部10 cm深度与其他层次土壤含水率的相关性好于中西部,中部相比东部和西部而言,各层次之间土壤含水率相关性最差。研究还发现,田间持水量和降水量是影响吉林省土壤含水率分布的主要因素,受土壤、气候等自然要素的空间异质性影响,田间持水量对中部和东部的土壤含水率影响更大,而降水对中部和西部的土壤含水率影响更大。

Soil Moisture Characteristics of Spring in Jilin Province and Its Influencing Factors

Soil moisture characteristics of spring in Jilin Province and its influencing factors were analyzed with the routine statistics method and geostatistics method integrating spatial analysis technique on GIS,based on the soil moisture data and related data in Jilin Province in 2003-2010.The results were as follows.1)In spring,the soil water content of 0-30 cm was very different between the west and the east of Jilin Province,its spatial distribution showed an increasing trend from west to east.And the spatial distribution of soil water content in 10 cm showed more difference compared with the other 3 layers.With the increase of soil depth,the variation of spatial distribution kept descending,the soil water content increased in the west and the central,but it had no significant change in the east.In all 4 soil layers there were three low soil water content regions and one high region.The low regions were appeared in the west of Jilin Province,Yanbian and the south of Tonghua.And the high region was appeared in Baishan.2)The soil water content data has better relativity between the closer soil layers.Compared with the west and central regions,the soil water content of 10 cm was correlated with other layers more closely in the east.And the correlation among the layers was the lowest in the central of Jilin Province.Additionally,soil field water-holding capacity and precipitation were the main factors that affect the soil water content in Jilin Province.3)The soil water content affected more on the soil moisture in the east and the central than the west in Jilin Province.And the effect of precipitation on the soil moisture in the west and the central regions was more significant than that in the east of Jilin Province.