The rules of sediment and runoff using field simulated rainfall trails.The results show that: the runoff on barren land were 1.15,1.46 and 2.64 times greater than that on grass land and PAM land and straw mulch land,the sediment production on barren land were 1.3,1.5 and 44.4 times greater than that on grass land and PAM land and straw mulch land in the same rainfall intensity,and straw mulch was better than the others on the effect of soil and water conservation;cumulative sediment linearity increase with ...