Effects of Amorpha fruticosa on soil physical composition and nutrient content

Taking Amorpha fruticosa with different cultivation ages in Southern Mu Us desert as objectives, a study was made on the physical composition and nutrient content of soil under A.fruticosa, and correlation between soil nutrients and dust particles were analyzed. The results showed that refined degree of soil under A. fruticosa increased gradually with the increasing of A. fruticosa cultivation ages. For example, the refined degree of surface soil (0-10 cm) was 1951197619832005, and dust particles content of A. fruticosa planted in 1951 was 4.3%. pH values of vertical soil profile in A.fruticosa decreased from bottom, and pH value of surface soil (0-10 cm) was the lowest. pH values of the same soil layer reduced with the increasing of cultivation ages. All nutrients content (except of total K and NH4+N) of soil (0-20 cm) increased in varying degrees. The content of organic carbon, total N, NO3-N, total P and rapid available P increased with the increasing of cultivation ages, while there was no apparent regularity in content of NH4+N and total K.