【摘要】 降雨是引起土壤侵蚀的主要动力因素,而降雨侵蚀力是引起土壤侵蚀的主要动力因子,对于降雨侵蚀力时空分布规律的定量研究是进行土壤侵蚀预报的基础。以丹东地区41个雨量站1990~2000年逐月降雨资料,依据有关降雨侵蚀力的计算方法,估算丹东不同地区的降雨侵蚀力,并在Arcinfo软件支持下对所得结果进行时空分布规律的分析。结果表明:(1)在空间分布上,丹东地区多年年均降雨侵蚀力总体趋势是由南向北递增。(2)降雨侵蚀力的月分布情况与降雨量的月分布情况大致相一致,且月R值的年内变化显著。(3)年R值的年际变化在空间分布上大致呈南北高,中间低的特点。更多还原

【Abstract】 Rainfall is the main dynamic factor that causes soil loss and rainfall erosivity,rainfall erosivity energy is the main dynamic index,but information on estimating rainfall erosivity accurately and analyzing the spatial distribution and temporal change of rainfall erosivity is key to predicting soil erosion.According to the continuous month rainfall data of ten years during 1990～2000 at 41 stations,the R value of different areas in Dandong regions were calculated.A Spatial-temporal distribution analysis and research on the result was made based on the support of Arcinfo software.software.The results show:(1) The spatial distribution of rainfall erosivity shows increasing trend from the south to the north.(2) The spatial distribution of rainfall erosivity is similar to the distribution of rainfal1,and evidence differences of R value of among several months.(3) The CV of R value of year is higher in south and north areas and lower in middle area in the spatial distribution.更多还原