多个涝渍过程连续作用对棉花的影响

现蕾花铃期是棉花产量形成的关键生殖生长阶段,该阶段长江中下游地区处于雨季,棉田受多个涝渍过程连续作用比较常见。通过测坑试验研究发现,在多个涝渍过程连续发生的条件下,受涝3 d、涝后3 d将地下水位控制在30 cm,对现蕾开花结铃期的棉花植株正常生长有显著影响;作物相对产量Ry与受涝累积时间Tw和地下水位埋深小于某一特定值的作用时间Tx之间有极显著的二元一次相关关系;涝、渍对作物的影响不同,3年资料综合分析表明,它们对作物的影响度分别为0.676~0.713和0.287~0.324。

Influence of Continuous Stress from Multiple Processes of Surface and Subsurface Waterlogging on Cotton

Stage of cotton with buds,flowering and bolls,is a critical phrase of reproduction growth for cotton yield,in the stage the middle and down reach of Yangtze River is just in rainy reason,cotton field often suffers waterlogged stress from a few process of surface and subsurface waterlogging.Through test-pit experiment,the research found,when multiple process of surface and subsurface waterlogging occur continuously,during cotton with buds,flowering and bolls,the crop to be inundated at the water depth of 5 ~10 cm for 3 days,and water-table to be controlled 30 cm beneath field surface in the third day after inundation have an important role in normal growth of cotton plants;a significant correlation of two variables with the first power existed among R_y(crops relative yield),T_w(sum of day that crop is in waterlogged),and T_x(sum of continuous day of groundwater table less than a certain characteristic value);influence of surface and subsurface waterlogging on crop is different,by 3 years' information to be analyzed the results had been obtained that degree of surface waterlogging and subsurface waterlogging affecting the yield is separately 0.676～0.713 and 0.287～0.324.