Lingbo Xiao
Advances in Earth Science, 2020 35 (5): 487
Based on records on famine kept in historical documents, 2950 famine events counted with “county time” in North China during 1736-1911 were collected, and annual famine index series in North China was reconstructed using weighted average method according to the severity of famine. Spatio-temporal distribution of famine and its relationship with climate, disaster and harvest was analyzed. The research shows that variation of temperature and precipitation has significant negative correlation with poor harvest and famine. The drought has a more significant correlation with harvest and famine than flood. In 1736-1795 when was at the peak of the Qing dynasty, the sensitivity of poor harvest and f. . .
Yuanbo Liu, Guiping Wu, Xiaosong Zhao, Xingwang Fan, Xin Pan, Guojing Gan, Yongwei Liu, Ruifang Guo, Han Zhou, Ying Wang, Ruonan Wang, Yifan Cui
Advances in Earth Science, 2020 35 (5): 496
With significant development since the beginning of the 21st century, hydrologic remote sensing becomes one of the most active disciplines in earth sciences, offering numerous opportunities and advances for watershed hydrology and other disciplines of geography. This commentary highlights the specialty and restriction of remote sensing for watershed hydrology on three aspects: watershed closure in water budget, watershed-scale effectiveness of hydrologic parameter retrievals, and watershed model inputs for data assimilation. The current challenges include rational watershed-scale validation, uncertainty control in retrievals, and error sources in data assimilation.
Jianguo Xiong, Youli Li, Peizhen Zhang
Advances in Earth Science, 2020 35 (4): 388
The planation surface occupies a large area and its formation spans a long-time scale. It is an important content and basic theoretical problem in geomorphology research. In this article, the basic concepts, related theories and development history of the three main types of planation surfaces, i.e. peneplain, pediment, and etchplain, were briefly reviewed. Then, based on the relationship between planation surface and strata, the chronological study of overlying and underlying strata, and some comprehensive chronological methods were briefly introduced. The respective and combined influence of tectonic movement and climate change on the development, final formation and disintegration of plan. . .
