TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (3): 495-502.doi: 10.13284/j.cnki.rddl.002832

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Rainfall Erosivity in the Lianjiang Watershed in Karst Areas of Northern Guangdong, China

WANG Mingchong1,2,ZHANG Xinchang1,WANG Xizhi2,WEI Xinghu2,LI Huixia2   

  1. (1.School of Geography Science and Planning,Sun Yat-Sen University,Guangzhou 510275,China;2.Center for Research of Territorial Resource Environment and Tourism,Foshan University,Foshan 528000,China)
  • Online:2016-05-05 Published:2016-05-05

Abstract: One of the main ecological environment problems is soil erosion for the Lianjiang Watershed. Rainfall erosivity reflects potential ability of soil erosion caused by rainfall. Therefore it is of great significance for valuing consequences of regional soil loss caused by regional rainfall erosivity precisely and formulating measures to maintain soil and water. We arranged the data of daily precipitation from 1980 to 2013 at 35 meteorological stations along the Lianjiang river basin. Based on the data above, we got RA, RB and RC, which were calculated from daily precipitation, monthly precipitation and annually precipitation. We got the optimum R through the test of effective coefficient M accordingly. Next, we used the Inverse Distance Weighted (IDW), Spline with Tension and Ordinary Kniging for spatial interpolation and test to ensure the most accurate interpolation method, and then made interpolation analysis. The result showed that: the IDW and monthly precipitation was more suitable for the calculation and valuation of rainfall erosivity in the Lianjiang Watershed. The spatial-temporal variation of rainfall erosivity in the Lianjiang Watershed was evident. The spatial distribution of rainfall erosivity was similar to that of precipitation year-by-year. In the middle-upper reaches of the Lianjiang River, the average annual rainfall erosivity was found significantly higher in high and large mountain areas than in other places. There was more plentiful precipitation in the lower reaches of the Lianjiang River, and also the average annual rainfall erosivity in the areas was relatively high.

Key words: rainfall erosivity, spatial interpolation, the Lianjiang Watershed, Karst areas, Northern Guangdong