玉米器官生长相关性对水分胁迫的响应

Responses of Maize Organ Growth Correlation to Water Stress

作物生长相关性及其对水分胁迫的响应是建立物质分配模型,模拟作物生长的重要依据。利用山西省霍泉试验站夏玉米(4a)和文峪河试验站春玉米(2a)资料分析得出:玉米茎叶比、粒茎比和根冠比随发育时间分别呈S形、指数函数和幂函数曲线变化,霍泉茎叶比、粒茎比和文峪河根冠比的实测值与模拟值的相关系数均在0.8以上,拟合精度较高。两站6a都受到了不同程度的水分胁迫,且水分胁迫大多发生在抽雄灌浆期。水分胁迫指数σ可以很好地描述作物生长相关性对水分胁迫的响应,其中春玉米根冠比受水分胁迫影响最大(σ值最大,为0.166),夏玉米(σ值为3.7×10^(-3))和春玉米茎叶比(σ值为1.5×10^(-4))受水分胁迫影响均较小,霍泉夏玉米粒茎比(σ值为0.065)的受水分胁迫影响较文峪河春玉米(σ值为1.0×10^(-8))大。

The correlation of crop growth and its response to water stress are an important basis for establishing a material distribution model and simulating crop growth.Using the data of summer maize(4 years)at Huoquan Experiment Station in Shanxi Province and spring maize(2 years)at Wenyuhe Experiment Station,it was concluded that stem-leaf ratio,grain-stem ratio and root-shoot ratio of maize showed an Sshape,exponential function and power function curve with growth time,respectively.The correlation coefficients between measured and simulated values of stem-leaf ratio,grain-stem ratio in Huoquan and root-shoot ratio in Wenyuhe were all above 0.8,and the fitting accuracy was high.Both stations have been subjected to varying degrees of drought stress for 6 years,and most of the water stress occurred in the filling stage of male-pumping.The root-shoot ratio of spring maize was mostly affected by water stress(σ=0.166),stem-leaf ratio of summer maize(σ=3.7×10^(-3))and spring maize(σ=1.5×10^(-4))were less affected by water stress,and the effect of water stress on grain-stem ratio of summer maize in Huoquan(σ=0.065)was greater than that of spring maize in Wenyuhe(σ=1.0×10^(-8)).