It can be effectually identified that whether a reservoir only produces oil through the cross plot of water saturation and irreducible water saturation.

Owing to the low economic efficiency and high consumption proportion of agricultural water use, the primary content of worlds water transaction is agricultural water rights shift.

The clustering analysis of least distance method was applied, the results showed that types of the phytocoenosium are 4: high function, commonly function, low function and degenerative function type.