| In terms of EOF,correlation and tendency analysis methods,the temporal and spatial feature of soil moisture of He'nan Province in recent 20 years were analyzed.By establishing multiple regression equations between soil moisture and temperature and precipitation,the relation between soil moisture and the two factors was quantized.The results reveal that,the spatial distribution of soil moisture has obvious diversity.It decrease gradually from south to northeast and northwest in general.The annual variability of soil moisture has an unobvious down tendency,while there are different variable tendencies among different seasons in a year.The soil moisture in spring was small,but there is an increasing tendency in summer.Also it keeps a high-level in autumn and winter.The soil moisture has a negative correlation with temperature significantly,and a significant positive correlation with precipitation.In seasons the major factors that influence the variability of soil moisture are: In spring the soil moisture decreased due to temperature upswing;In summer it increased with the increasing amount of precipitation;Because of rainfall cumulated tardily,soil moisture raised slowly in autumn.In winter the variety of soil moisture was not obviously mainly because the temperature was low. |