地理学报 ›› 2001, Vol. 56 ›› Issue (6): 673-681.doi: 10.11821/xb200106006

• 论文 • 上一篇    下一篇

土壤可蚀性动态变化规律研究

张科利, 蔡永明, 刘宝元, 彭文英   

  1. 北京师范大学资源与环境科学系,北京100875
  • 收稿日期:2001-04-12 修回日期:2001-08-05 出版日期:2001-11-15 发布日期:2001-11-25
  • 基金资助:
    国家科技部“973”项目(G19990436);杰出青年基金项目(49725103)资助

Fluctuation of Soil Erodibility Due to Rainfall Intensity

ZHANG Ke-li, CAI Yong-ming, LIU Bao-yuan, PENG Wen-ying   

  1. Dept. Resource and Environmental Sciences, Beijing Normal University, 100875
  • Received:2001-04-12 Revised:2001-08-05 Online:2001-11-15 Published:2001-11-25
  • Supported by:
    State 973 Project No. 619990436; National Natural Science Foundation of China, No. 49725103

摘要: 通过回顾己有的研究成果,分析评价了现有具有代表性的土壤可蚀性评价指标的优缺点,提出了建立适用于土壤侵蚀预报的可蚀性评价指标的原则。并运用野外观测资料,计算分析了我国黑土、黄土,以及日本火山灰土等土壤可蚀性的季节变化规律,深入研究了土壤可蚀性随次降雨强度、不同强度段降雨组合的变化趋势。结果表明,单位降雨侵蚀力所对应的土壤流失量是反映土壤性质与流失量之间定量关系的最好指标,但不能把目前使用的土壤可蚀性指标直接移植于次降雨模型中。土壤可蚀性具有明显的季节变化,而其变化规律还存在地域差异性。采用最大30分钟雨强大于25~30 mm/hr降雨的侵蚀产沙资料,计算的土壤可蚀性值比较稳定且接近这土类可蚀性的多年平均值。

关键词: 水土保持, 土壤侵蚀, 可蚀性, 动态变化

Abstract: On the base of evaluation of previous researches about soil erodibility, the advantages and disadvantages of present representative indexes of soil susceptibility to erosion were discussed in this paper, and principle of choosing index of soil for soil loss prediction was suggested. The erodibility values of phaeozem, loess in China and andisol in Japan were calculated using the data from fieldobservations. The variance in erodibility through seasons and the relation of soil erodibility to rain intensity was also analyzed. Results show that the rate of soil loss per rainfall erosivity index used in USLF may be the best index to represent the effect of soil properties on soil erosion. However, the present erodibility factor in use can not be applied directly in predicting soil loss caused by a specific rainstorm. The values of soil erodibility vary obviously through seasons and have different pattern from one place to another. But the field runoff plot data of which the maximum 30-minute rainfall intensity is larger than 25-30mm/hr are used to calculate the soil erodibility, the values appear relatively stable and approaches to annually average erodibility value.

Key words: soil and water conservation, erosion, erodibility, fluctuation

中图分类号: 

  • S157.1