Reexamination of the Xie model and spatiotemporal variability in rainfall erosivity in mainland China from 1960 to 2018
Reexamination of the Xie model and spatiotemporal variability in rainfall erosivity in mainland China from 1960 to 2018
复制标题
1960-2018年中国大陆降雨侵蚀力时空变化与Xie模型的再检验
DOI：
10.1016/j.catena.2020.104837
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发表时间：
2020-12
期刊：
影响因子：
6.2
通讯作者：
Lai Chengguang
中科院分区：
文献类型：
--
作者：
Chen Yuhong;Xu Menghua;Wang Zhaoli;Chen Wenjie;Lai Chengguang
土壤侵蚀已成为全球最严重的环境和生态危机之一。降雨侵蚀力测量降雨引发土壤侵蚀的潜在能力。利用谢模式估算了1960 - 2018年中国大陆降雨侵蚀力的时空变化特征。通过与两个典型的日模式和一个小时模式的比较，用密集分布的台站资料对谢模式的精度进行了重新检验和进一步验证。并讨论了降雨侵蚀力变化与土壤侵蚀的关系。结果表明，中国大陆年降雨侵蚀力范围为2 ~ 23129 MJ·mm/（hm ~ 2·h·a），自东南向西北逐渐减小。年降雨侵蚀力也呈显著增加趋势（P < 0.05），平均值为3738 MJ·mm/（hm 2·h·a）·a，增长率为8 MJ·mm/（（hm 2·h·a）·a）。2002年出现显著性转折点（P < 0.05）。多个振荡周期被确定，但3.5年被确定为主要的振荡周期。谢模式被证明是更准确的估计降雨侵蚀力在中国大陆，因为它的简单的公式，这减少了计算时间和所需的努力，使计算。因此，谢氏模型提供了一个稳健的每日模型，可以在中国大陆广泛使用。虽然年降水量减少，但降水浓度和强度的增加似乎是降雨侵蚀力增加的主要原因。需要采取有效、经济和环保的措施来应对中国大陆土壤保护的一些挑战。
Soil erosion has become one of the most serious global environmental and ecological crises. Rainfall erosivity measures the potential ability of precipitation to trigger soil erosion. This study estimated the degree of rainfall erosivity in mainland China from 1960 to 2018 using the Xie model and analyzed its spatiotemporal variability. The accuracy of the Xie model was reexamined and further verified with the use of data from densely distributed stations by comparing it with two typical daily models and an hourly model. The relationships between changes in rainfall erosivity and soil erosion were also discussed. Results showed that annual rainfall erosivity in mainland China ranged from 2 to 23,129 MJ⋅mm/(hm2⋅h⋅a) and decreased gradually from southeast to northwest. Annual rainfall erosivity also showed a significant increasing trend (P < 0.05) with a mean value of 3738 MJ⋅mm/(hm2⋅h⋅a) and a growth rate of 8 MJ·mm/((hm2·h·a)·a). The significant breakpoint (P < 0.05) occurred in 2002. Multiple oscillation periods were identified, but 3.5 years was identified as the main oscillation period. The Xie model was shown to be more accurate for estimating rainfall erosivity in mainland China because of its simple formula, which reduces computing time and the effort needed to make calculations. Therefore, the Xie model provides a robust daily model that could be widely used in mainland China. Although annual precipitation has reduced, the increasing concentration and intensity of precipitation appears to be the primary reason underlying the increase in rainfall erosivity. Efficient, economic, and environmental measures need to be taken to address some of the challenges of soil conservation in mainland China.
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