地理科学 ›› 1999, Vol. 19 ›› Issue (3): 265-270.doi: 10.13249/j.cnki.sgs.1999.03.265

• 研究报道 • 上一篇    下一篇

滇东北山区坡耕地降雨侵蚀力研究

杨子生   

  1. 云南大学地球科学系, 昆明650091
  • 收稿日期:1998-09-18 修回日期:1999-01-04 出版日期:1999-05-20 发布日期:1999-05-20
  • 基金资助:
    国家自然科学基金(49461007)《滇东北山区坡耕地水土流失系统研究》

A STUDY ON EROSIVE FORCE OF RAINFALL ON SLOPING CULTIVATED LAND IN THE NORTHEAST MOUNTAIN REGION OF YUNNAN PROVINCE

Yang Zisheng   

  1. Department of Earth Science, Yunnan University, Kunming 650091
  • Received:1998-09-18 Revised:1999-01-04 Online:1999-05-20 Published:1999-05-20

摘要: 降雨侵蚀力R值是建立土壤流失方程的最基本因子之一。通过对标准径流小区的实测土壤侵蚀量和侵蚀性降雨资料进行分析,确定出滇东北山区坡耕地降雨侵蚀力(R)的最佳计算指标为R=E60·I30,计算和分析了本区域降雨侵蚀力(R)的时空分布特征。

Abstract: The value of R, erosive force of rainfall,is one of the basic factors used for setting up soil loss equation.Through analysing the data of soil erosion and erosive rainfall measured on the standard runoff pot,the best index in the northeast mountain region of Yunnan Province for calculating the erosive force of rainfall is defined as: R=E60·I30. According to this index and the data of rainfall from 16 stations in 1980-1997,we calculate the erosive force of rainffall (R) of every station in the northeast mountain region of Yunnan Province, and analyse the time space distribution characteristics of erosive force of rainfall in this region.The results of the calculation and the analysis show that the average annual value of R in this region is 293.8J/m2.For the distribution in a year,the value of R is higher in June~August,equivalent to 77.68% of the annual value.The annual variation of the value of R is also very large with a maximum of R 726.5J/m2 in a year to a minimum of R 94.2J/m2 in a year. For the spatial distribution,the value of R in northern area was higher than that in southern area,and in the dry and hot valley of the Jinsha River is lower than that in high altitude mountain zone.

中图分类号: 

  • S157.1