花铃期涝旱胁迫棉花株高生长规律分析与模拟

Analysis and simulation of cotton height under waterlogging and drought stress during flower period

通过设计和开展6组不同水旱胁迫处理的棉花测坑实验,对花铃期不同水旱胁迫处理下的株高生长规律进行了定性分析,并以有效积温为自变量,建立了基于修正后的Logstics模型的棉花株高水旱胁迫模型,提出了影响株高变化的基本水旱胁迫项与组合水旱胁迫项.建模结果表明,旱胁迫对株高生长表现为明显抑制,涝渍胁迫根据胁迫历时长短表现为不同程度的促进,旱转涝渍组合胁迫表现为以旱为主的抑制.模型总决定系数在0.98以上,误差均方根均在最大株高的5%以内,说明该模型较好地反映了棉花株高对于不同水旱胁迫处理的响应规律,能够模拟水旱胁迫条件下棉花株高的生长发育状况.

The analysis and simulation of cotton height under waterlogging and drought stress are of great significance for assessing grop growth condition and waterlogging and drought impact,making irrigation forecast and improving lodging resistance.Through the six drought and waterlogging stress treatments on cotton during the flower period,qualitative analysis is made for regular pattern of cotton height and a waterlogging and drought stress model is established based on modified Logstics model.The established model includes a basic stress item and a combined one.The results show that the drought stress has significant inhibition on cotton height,while variable waterlogging stress has different degrees of promotion.And the drought stress combined with waterlogging stress is dominated by drought.The total coefficient of determination is above 0.98;and the predicted root mean square error is within 5% of the maximum height,which indicates that the model well reflects the response of cotton height to different waterlogging and drought stress and can simulate the growth and development of cotton height.