1954-2014年连云港赣榆区降雨侵蚀力的时空变化特征

doi:10.11934/j.issn.1673-4831.2018.05.002

Abstract

Abstract:

Soil erosion is recognized as one of the most serious ecological and environmental issues today. A rainfall-runoff erosivity factor, together with the effects of duration, magnitude and intensity of rainfall event, can be used to evaluate a rainfall event's potential ability to cause erosion. It is important to study the temporal and spatial distribution characteristics of rainfall erosivity in Ganyu District of Lianyungang, which is of great significance to the evaluation of soil loss, risk assessment and management in the northern rocky mountain area. Taking the Ganyu District as the study case, the daily rainfall data of 12 precipitation stations in Ganyu District during 1954-2014 in a rainfall erosivity model proposed by the Chinese scholar Zhang Wenbo were applied. The Inverse distance weighted space interpolation method, Mann-Kendall non-parametric test variation coefficient and rescaled range analysis were applied to analyze the temporal and spatial variation characteristics of rainfall erosivity. The results show that the range of annual rainfall erosivity in Ganyu District was 2 048.3-12 369.2 MJ·mm·hm^-2·h^-1·a^-1 with an average value of 6 154.9 MJ·mm·hm^-2·h^-1·a^-1, which is consistent with the temporal variation of annual rainfall and erosive rainfall. The distribution curve of rainfall erosivity has a single peak. The rainfall erosivity from April to September is 89% of the whole year. The duration of flood season in Jiangsu Province is same as that in Ganyu District. The rainfall erosivity in a year was divided into four periods, including high-value period, mid-value period, low value period and non-erosive period. The rainfall erosivity from July to August accounted for 61.5%, so the risk of soil erosion in this period is high. In the spatial distribution of the Ganyu District, the rainfall erosivity decreased and the contours gradually concentrated from southeast to northwest as a whole. The interannual variation of the R value in coastal area is larger than that in inland area, and the trend of change is obvious in different regions. The whole area of Ganyu area showed a low degree of variation without a significant upward trend. The analysis showes that the rainfall erosivity will continue to increase after 2014 and soil erosion will be further aggravated.

Key words: rainfall, erosion, soil and water loss, temporal and spatial variation, the northern rocky mountain area, Ganyu District in Lianyungang

CLC Number:

S157.1

LIN Jie, ZHU Yan-fang, PAN Ying, ZHANG Yang, CHENG Jian-min. Temporal and Spatial Variation Characteristics of Rainfall Erosivity During 1954-2014 in Ganyu District, Lianyungang[J]. Journal of Ecology and Rural Environment, 2018, 34(5): 393-400.

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Temporal and Spatial Variation Characteristics of Rainfall Erosivity During 1954-2014 in Ganyu District, Lianyungang

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