Abstract:

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.

Key words: Jilin Province, soil water content, distribution characteristics