Effects of No-tillage on Soil Properties Affecting Wind Erosion during Fallow in Semiarid Inner Mongolia, China
Soil erosion by wind may even become severer when inappropriate tillage practices are taken on highly erodible soils in semiarid Inner Mongolia, China. But very few studies have focused on the surface related factor effected the wind erosion during fallow season. The objectives of this paper were to analyze the effects of wind erosion under plough tillage and no-tillage, to evaluate changes in soil physical, chemical and biological properties due to different tillage practices, and to discuss the effects of soil properties on wind erosion. Results showed: (1) soil loss from plough tillage (FT) was as much as 3-26 times higher than that of the no-tillage (NT), the aerodynamic roughness lengths under plough and no- tillage were 0.032, 0.417, respectively, which effected by soil properties. (2) No-tillage soil contained more clay and fine sand in the 0-10cm topsoil layer than the plough tillage soil. Especially at all there examined depths, the content of very coarse sand under no-tillage farmland were always more than that under plough tillage, which enhanced the percentage of soil surface covered with nonerodible material. (3) Plough tillage practice decreased available K at the 0-5cm depth by 77％ compared to no-tillage. A similar trend was observed for total N, SOC and available P, although the decrease was lower than that of available K. At all four examined depths, the concentrations of SOC were lower in the plough tillage soils than in the no- tillage soil, but significant differences (P<0.05) were found only at the 0-5cm and 5-10cm depths. (4) MBC concentration under NT was 2.1 times as much than that under PT in 0-10 cm soil depth. Our results suggest that changes and characteristics of particle size fractions might provide useful indications of wind erosion, the soil physical properties under no- tillage was better to control wind erosion and the MBC activity could be used as a valuable biological indicator that significantly affects wind erosion on cultivated soil.
No-tillage Plough tillage Soil properties Wind erosion
Qin Hongling Gao Wangsheng Ma Yuecun Wei Wenxue Zhao Peiyi
Institute of Subtropical Agriculture, Chinese Academy of Science, Changsha 410125, China College of Agronomy and Biotechnology ,China Agricultural University, Beijing, 100094 Soil aztd Fert Soil aztd Fertilizer Institute, Hunan Academy of Agricultural Sciences, Changsha 410125 Institute of Subtropical Agriculture, Chinese Academy of Science, Changsha 410125, hina Department of Soil Chemistry, Inner Mongolia Academy of Agricultural Sciences, Hohhot, 010031
国际会议
郑州
英文
108-119
2007-10-01（万方平台首次上网日期，不代表论文的发表时间）