Different land use affect soil physical properties and nutrient characteristics

taking the hilly upland of red soil as a study case

the system selected consist of 4 different treatments of 10 years

that is regional natural recuperation

farming plot

planted forest tea plant and orange.We have investigated the soil characteristics and aluminum forms under different land use.The result showed that there is significant difference in the content of soil pH

organic matter and active aluminum forms by reasons of different land use.Compare to regional natural recuperation

the content of soil exchangeble aluminum in farming plot decreased because of straw and root stubble incorporation into the soil and adsorbent hydroxy aluminum and organically complexed aluminum increased.As for planted tea and orange plant

soil exchangeble aluminum increased

adsorbent hydroxy aluminum and organically complexed aluminum decreased.Soil corrasion transite to soil deposite from uphill slope to downhill slope position

so soil dissovled organic material piles up along with the runoff

which will increase soil pH and soil organic matter in downhill slope position.The correlation analysis indicated that soil pH value have a negative correlation with soil exchangeable aluminum and a positive correlation with soil adsorbent hydroxy aluminum remarbly

the equation is as follows respectively: y=-97.6x 6009.2(R2= 0.7315)

y = 2810.8x-9293(R2=0.9003).Soil organic matter correlate with soil exchangeble aluminum negatively and with soil organically complexed aluminum positively

the equation is: y=-2963x 17616(R2=0.8977)and y=553.4x4779.1(R2=0.4364).As a result

the results showed that soil aluminum forms and nutrient properties largely depended on the land utilization and landscape on slope.