Abstract: Based on two consecutive years(2002-2003) of stationary monitoring of soil moisture in red soil sloping-land,spatio-temporal relationships between land use and soil moisture were analyzed.Results show(1)the effect of land use on average soil moisture of 0-90 cm in the crop growing season varied statistically from year to year,and the soil moisture was higher in rainy year than in average year;(2)seasonal change in soil moisture under the same land use was obviously different between rainy year and average year.In the rainy year,soil moisture remained high and did not vary much through the year;while in the average year,soil moisture obviously fluctuated sharply,and stayed high in February to early July,then dropped rapidly,and finally came slowly up again;(3)when a rainy year was followed by an average year,the soil moisture variation curves did not change much.In the wetland pine zone,it was of the fluctuation type,and in the other four zones,of the increasing type;and(4) variation of soil moisture in a year was always higher in the upper slope than in the down slope.Prolonged drought reduced the amplitude of variation of soil moisture distribution along the slope.

Key words: red soil, hilly sloping-land, soil moisture, land use type, spatial and temporal relationship