我国南方早稻洪涝灾害指标试验研究

Experimental research on flood disaster indices of early rice in southern China

我国南方早稻在抽穗期正逢雨季,易受到洪涝灾害的影响。为了确定不同的洪涝程度对早稻产量及产量结构因素的影响,2007年在江西、湖南、湖北三地进行了洪涝试验。通过减产百分率进行的灾害水平鉴定得出:水淹1/2株高处达3d,4d为轻度影响;水淹1/2株高处达5d,水淹2/3株高处达3d,4d为中度影响;水淹2/3株高处达5d,水淹4/5株高处达3d,4d,5d为重度影响。

Because of the rainy season in southern China, the early rice encounters flood disaster＇s influence easily at heading stage. For determinating the influence index of different flood degree to early rice output and output structure factor, the early rice flooding experiments were carried out in Jiangxi, Hunan and Hubei provinces in 2007. The conclusion is drawn through comparison of the underproduction percentage ： flood at 1/2 plant height for 3-4 days has a light influence, flood at 1/2 plant height for 5 days or at 2/3 plant height for 3-4 days has a moderate influence, flood at 2/3 plant height for 5 days or at 4/5 plant height for 3-5days has a severe influence.