JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (2): 278-291.doi: 10.11849/zrzyxb.20160244

• Resource Evaluation • Previous Articles     Next Articles

Spatial and Temporal Variation Characteristics of Rainfall Erosivity in the Songhua River Basin from 1960 to 2014

ZHONG Ke-yuan1, ZHENG Fen-li1, 2   

  1. 1. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;;
    2. Institute of Soil and Water Conservation CAS & MWR, Yangling 712100, China;
  • Received:2016-03-10 Online:2017-02-15 Published:2017-02-15
  • Supported by:
    National Natural Science Foundation of China, No. 41571263. ]

Abstract: Soil erosion is one of the most serious global ecological environmental issues and rainfall erosivity is an important parameter influencing soil loss. This paper analyzed spatial and temporal variation characteristics of rainfall erosivity in different morphologic regions and sub-river basins within the Songhua River Basin from 1960 to 2014 based on Mann-Kendall, Wavelet Analysis and ArcGIS interpolation method. The results showed that the average rainfall erosivity in the Songhua River Basin was 1 717.6 MJ·mm·hm-2·h-1·a-1 and the trend of change was not significant whereas significant abrupt changes showed in 1982 and 1998. The main period was 15.2 a while the minor period was 4.7 a. The spatial variation of rainfall erosivity was generally consistent with the spatial variation of precipitation. Rainfall erosivity decreased from southeast to northwest, which was consistent with the influenced region of the southeast monsoon. The trend of rainfall erosivity varied in different sub-regions in the Songhua River Basin. Rainfall erosivity showed increasing trend in northwestern part of the basin and a deceasing trend in north eastern and south western part of the central plains region. There was a strong correlation between the rainfall erosivity and precipitation, which sequenced as eastern mountainous hilly region, central plains region and western mountain areas. In eastern mountainous hilly region, the rainfall erosivity significantly correlated with latitude and longitude, whereas in central plains region and western mountain areas there were no significant correlations between the rainfall erosivity and latitude, longitude as well as altitude. Rainfall erosivity varied in different sub-river basins within the Songhua River Basin. The rainfall erosivity decreased from the second Songhua River Basin, the midstream area of the Songhua River to the Nenjiang River Basin, which was consistent with the distribution of precipitation. In all sub-river basins within the Songhua River Basin, the rainfall erosivity showed a non-significant downward trend during the past 55 years.

Key words: rainfall erosivity, soil erosion, the Songhua River Basin

CLC Number: 

  • S157.1