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| 1 | Rainfall and Tillage Impacts on Soil Erosion of Sloping Cropland with Subtropical Monsoon Climate- A Case Study in Hilly Purple Soil area, China显示文摘Under global warming, storm events tend to intensify, particularly in monsoon-affected regions.As an important agricultural area in China, the purple soil region in the Sichuan Basin, where it has a prevailing monsoon climate, is threatened by serious soil erosion. Tillage operations alter runoff and soil erosion processes on croplands by changing the physical properties of the soil surface. To clarify the relationship between tillage and soil erosion in the purple soil region, three different tillage practices in this region were investigated at the plot scale over 4 years: bare land with minimum tillage(BL),conventional tillage(CT) and seasonal no-tillage ridges(SNTR) which was initially designed to prevent soil erosion by contoured ridges and no-tillage techniques. The results showed that although there were no significant differences in the surface runoff and soil erosion among the three practices, BL causedrelatively high surface runoff and soil erosion,followed by CT and SNTR. Classification and comparison of the rainfall events based on cluster analysis(CA) verified that the surface runoff was not significantly different between most intensive event and long intensive events but was significantly different between most intensive and short and medium-duration events. Only the rainfall events with the highest rainfall intensity could trigger serious soil erosion, up to 1000 kg ha-1 in the region. Further detailed investigations on the effects of tillage operations on the soil erosion in a subtropical region with a monsoon climate are needed to provide a basis for modeling catchments and designing better management practices. | TANG Jia-liang CHENG Xun-qiang ZHU Bo GAO Mei-rong WANG Tao ZHANG Xi-feng ZHAO Pei YOU Xiang | 2015 | Journal of Mountain Science2015，12，1： | 9 |
| 2 | 长江源区1980—2020年水沙变化规律显示文摘基于长江源区1980—2020年12个站点日降水及直门达站年径流及泥沙等数据,利用中国土壤流失方程、偏最小二乘结构方程和累积距平等方法,分析源区土壤侵蚀、河道水沙变化及长时间尺度下与降水的耦合作用机制。结果表明:(1)长江源区年土壤侵蚀模数呈显著增加趋势(P<0.05),且年均土壤侵蚀模数为4.71 t·hm^(-2)·a^(-1),强烈及以上强度侵蚀主要分布在源区东南部。(2)源区径流量显著增加(P<0.05),且2004年为突变年,含沙量和输沙量无明显变化趋势。(3)降水对径流和土壤侵蚀均有显著正向效应,解释度分别为70%、52.9%。径流和土壤侵蚀对输沙量变化均具有直接正向影响,降水、径流和土壤侵蚀对输沙量变化的综合解释度达72.5%,结果可为流域生态工程实施效果的研究与评价提供科学依据。 | 姚春艳 刘洪鹄 刘竞 | 2023 | 干旱区研究2023，40，5： | 1 |
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