Effects of different land use modes on physical and chemical properties of saline-alkali soil in Yellow River Delta

The effects of different land use modes on physical and chemical properties of the saline-alkali soil in Yellow River delta were analyzed by field soil sampling and laboratory experiment. The results showed that:1)the organic matter and total nitrogen quality content in the profile of 0 -10 cm of Robina pseudoacacia forest land were the highest, 17.30 and 1.04 g/ kg respectively. The average soil density in 0 -20 cm (1.33 g/ cm3 ) and conductivity in 0 - 100 cm (290.25 μs/ cm) were less than those of Tamarisk chinensis Lour. forest land and Gossypium hirsutum L. land. The porosity (51.91%) and clay partical quality content (3.99%) in 0 -20 cm were higher than those of Tamarisk chinensis Lour. forest land and Gossypium hirsutum L. land. 2)The pH value was 6.77 in 0 - 100 cm of Tamarisk chinensis Lour. forest, significantly lower than that of Robina pseudoacacia forest land and Gossypium hirsutum L.land (P < 0.01). The available potassium quality content in 0 - 100 cm of Tamarisk chinensis Lour.forest land was the highest(104.47 mg/ kg), significantly higher than that of Gossypium hirsutum L. land (P <0.01). There was no significant difference between Tamarisk chinensis Lour. forest land and Robina pseudoacacia forest land. The average available phosphorus quality content in 0 -100 cm was Gossypium hirsutum L. land > Tamarisk chinensis Lour. forest land > Robina pseudoacacia forest land. 3) The physical and chemical properties of the artificial Robina pseudoacacia forest land were better than those of natural regenerating Tamarisk chinensis Lour. forest land and artificial cultivated Gossypium hirsutum L.land. The results could provide reference for the reasonable use and improvement saline-alkali land of Hekou County in Yellow River Delta.