Abstract
Waterlogging risk assessment for winter wheat using multi-source data in the middle and lower reaches of Yangtze River
Highlights
Waterlogging is a kind of agro-meteorological disaster caused by excessive soil water, which might be crop-specific but the crop symptoms of waterlogging are generally uniform, e.g., anaerobic metabolism in roots due to hypoxia stress[1,2,3], decreased stomatal conductance and leaf water potentials[4], enhanced root and leaf senescence[5, 6], deficiencies of energy, carbohydrate and nutrients[7], and eventually, restricted crop growth and grain yield[8,9,10]
As the waterlogging disaster is the compound effects of waterlogging formative environment, disaster-causing factors, and hazard-affected body, we focused on the three factors in waterlogging risk assessment[39] and proposed a waterlogging risk assessment model of winter wheat as following: Dr = Ds×Dh×Dv where, Dr is the waterlogging risk assessment value; Ds is the sensitivity of waterlogging hazard formative environments determined by slope, low-lying degree, and soil physical properties (Equation (3)); Dh is the hazard risk of meteorological factors (Equation (9)); and Dv is the vulnerability of hazard-affected body determined by the winter wheat acreage and regional disaster-resister ability (Equation (12))
3.1 Waterlogging sensitivity The spatial distributions of slope, low-lying degree, and soil waterlogging index used in waterlogging sensitivity analysis are shown in Figures 3a-3c), respectively
Summary
Waterlogging is a kind of agro-meteorological disaster caused by excessive soil water, which might be crop-specific but the crop symptoms of waterlogging are generally uniform, e.g., anaerobic metabolism in roots due to hypoxia stress[1,2,3], decreased stomatal conductance and leaf water potentials[4], enhanced root and leaf senescence[5, 6], deficiencies of energy, carbohydrate and nutrients[7], and eventually, restricted crop growth and grain yield[8,9,10]. From 1981 to 2005, the waterlogging occurred with a frequency of about 2.5 years in Jianghuai plain area of Anhui Province and caused about 10% loss of winter wheat production. Chen Y Y, et al Waterlogging risk assessment for winter wheat in the middle and lower reaches of Yangtze River Vol 11 No. 199 body[22,23,24,25,26], and corresponding risk indices[27,28,29]. To our knowledge, waterlogging loss assessment and risk regionalization still did not attain enough attention, compared with its huge influence on winter crop production in China. A series of environmental factors, including geographical, agricultural, and meteorological variables such as slope, low-lying degree, soil waterlogging index, climate risk probability, physical exposure of winter wheat, and disaster-resisting performance index, were combined to facilitate the building of a comprehensive winter wheat waterlogging risk assessment model
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