In a typical black soil region

soil moisture content was invest igated using the Time Domain Ref lectometry in July

2004.The conclusion is that in the small drainage

soil moisture content within 10 cm of soil surface is the most variable and the least

and then increases rapidly below the surface layer.In a layer from 30 to 100 cm soilmoisture content tends to be steady.At the depth of 10 cm

the soil moisture content sort by ascending is downside part

middle part and upside part;to the 20 cm depth

the soil moisture content is consistent

but the ascendingsort is upside part

downside part and middle part between 30 cm and 100 cm.Soil moisture of the woodland on slope is far lower than the soybean land

and the impact of slope woodland seems to terminate at a depth of 1m;the woodland in gully is wider than that on slope

so the impact reaches to the depth more than 1m.Soil moisture of barley field is much lower than that of soybean field.