With climate change

temperature increase may affect soil moisture movement and content.Take the typical paddy soil(Wushan soil) as a study case

the water characteristics curves and soil reservoir capacity of Wushan soil were studied.The results were as follows:(1) Main factors affecting the water characteristics curves were bulk density and clay content.Soil water content decreased in following order: plough layer

plowpan

waterlogging-hydromorphic layer

and gley layer under saturated condition and water suction as 1.50×106 Pa(wilting point).(2) Available water content had significant negative correlation with bulk density and clay content.But it had significant positive correlation with porosity.(3) Bulk density and total porosity were the main factors impacting the saturate hydraulic conductivity while the capillary porosity and pH were the second factors.(4) Total reservoir capacity of Wushan soil in plough layer was 91.48 mm.Available water reservoir capacity was 22.02 mm

and the flood detention reservoir capacity was 20.50 mm.Therefore

this soil had good water status which not only guaranteed high and stable soil productivity

but also had a regulatory function of water storage.