According to theoretical calculate and water surge and lithology condition when digging into 3 coal, the maximal height of the crack strap is not attach to Quaternary alluvium.

Among them the paddy soil developed from the weathering product of limestone has much higher nutrient contents than the paddy soils developed from river alluvium and Quaternary Red Clay does.

Plant area was distributed over Quaternary system alluvium and deposit of oxbow lake facies, base rock is Tertiary red rock.