山东省降雨侵蚀力与气候指数关系研究

doi:10.11934/j.issn.1673-4831.2018.10.003

Abstract

Abstract:

Although water erosion is a key factor causing soil degradation, quantification of spatial and temporal variability in rainfall erosivity remains insufficient. Forced by the daily precipitation data from 18 meteorological stations, a monthly rainfall erosivity model was used to estimate the rainfall erosivity of Shandong Province from 1961 to 2010. Its temporal variation and trends were determined by means of Mann-Kendall trend test. Also, the relationship between rainfall erosivity and large-scale climatic oscillation were examined such as the Pacific decadal oscillation (PDO), nino/southern oscillation (ENSO) using the Pearson correlation coefficient, continuous wavelet transform (CWT), cross wavelet change (XWT) and wavelet coherence spectrum (WTC). The results show that annual rainfall erosivity experienced a downward trend during the past 50 years, especially since the 1980s. Summer and autumn rainfall erosivity exhibits the same trend with annual rainfall erosivity during the same periods, whereas upward trends occurs in the spring and winter rainfall erosivity. Seasonally, maximum rainfall erosivity occurs in July and minimum in December. The correlation between rainfall erosivity with the Pacific PDO and ENSO decreases from southeast coast to northwest inland. Rainfall erosivity of Shandong province reveals an approximately 0.8-2 year periodicity, which is similar to those for PDO and ENSO. In high energy area, the rainfall erosivity shows covariance with PDO and ENSO with periodicity of 4-5 years and 3-4 years, respectively. In low energy area, rainfall erosivity has a 4-year periodicity, which is same with PDO, but distinct from ENSO. These results are vital for soil and water conservation, and ecological restoration in Shandong Province.

Key words: Shandong Province, rainfall erosivity, climate indices, wavelet analysis

CLC Number:

S157
P46

XU Ze-hua, HAN Mei, LU Guang, ZHU Ji-qian. Relationship Between Rainfall Erosivity in Shandong Province and Climate Indices[J]. Journal of Ecology and Rural Environment, 2018, 34(10): 880-889.

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Relationship Between Rainfall Erosivity in Shandong Province and Climate Indices

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