摘要
通过采用示踪法对四川丘陵区坡耕地的耕作试验研究 ,获得了土壤耕作位移和土壤耕作侵蚀的直接证据 ,确定了耕作侵蚀是四川丘陵区土壤流失的原因之一。试验结果指出 ,四川丘陵区单次耕作的土壤位移量为 43.70～ 6 4.47kg/ m;平均土壤耕作侵蚀速率为 6 5 .0 5～ 97.0 5 t/ hm2 .a。土壤耕作位移受地面坡度的影响十分明显 ,平均位移距离与坡度间呈显著正相关关系。耕作侵蚀速率主要取决于坡体长度 ,只有在坡体长度相同的条件下 。
Tillage translocation and tillage erosion were studied in the hilly areas of Sichuan Basin, southwestern China using tracer technique. The effects of tillage translocation due to hoeing tillage on hillslopes are quite evident. A direct evidence of tillage erosion demonstrates that soil tillage is partly responsible for soil loss. Tillage translocation rates ranged from 43.70 to 64.47 kg/m, and average tillage erosion rates reached 65.05~97.05 t/hm 2.a. Soil translocation was related closely to slope gradient, with a significant linear correlation between mean displacement distance and slope gradient (P<0.01). Tillage erosion rates depends mainly on downslope parcel length due to small patches of the fields and shortly linear slope segment. Only when downslope parcel length is the same, do tillage erosion rates increase with the increase of slope gradient.
出处
《水土保持学报》
CSCD
北大核心
2001年第2期1-4,共4页
Journal of Soil and Water Conservation
基金
中国科学院山地环境学"百人计划"!(1999年度 )
人事部留学基金资助项目
