多个涝渍过程连续作用对棉花的影响

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

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Tx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。

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 Ry （crops relative yield）, Tx（sum of day that crop is in waterlogged）, and Tx（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.