氮肥和底墒对小麦同化产物累积与运转的调节效应模型

MATHEMATICAL MODEL STUDY ON EFFECTS OF NITROGEN AND SOIL MOISTURE BEFORE PLANTING ON ACCUMULATION OF PHOTOSYNTHATES AND MATTER TRANSLOCATION FOR WHEAT

以氮肥和底墒为变量，采用最优二次Ｄ饱和设计，系统分析了氮肥与底墒对小麦生长后期同化产物累积运转过程的影响，在同化产物累积与运转方面建立了一些数学模型，结果表明，小麦籽粒产量决定于抽穗后累积同化产物的能力，随着抽穗后同化产物积累量的增加，籽位产量中来源于抽穗后光合产物的比例上升，产量构成因素也随之改善；小麦籽粒产量与调运贮藏同化产物的能力呈显著负相关，籽粒中有９％～３６％来自抽穗前贮藏同化产物；通过水肥措施的应用可显著提高或改善同化产物的累积与分配比例，并提高水分和肥料的利用效率。

Two factors including nitrogen and soil moisture before planting were selected to deci- sion ,use of optimum design and computer technique. Analysing the effects of nitrogen and soil moisture before planting on accurmulation of photosynthates and matter translocation later stage growth and some mathematical function of these pramenters.The results showed that grain yield of wheat mainly produced from capactity of accurmulation of photosynthate after heading,As the increasing of these accurmulations, it will take much highter ratio in grain yields,and the yield component become better. Grain yields show much significitly negi-tine correlation with capactity of storage photosynthesis products. 9～36%of the grain yields come from storage photosynthate,through the application of water and fertilizer measure can remarkably improve the accurmulation an disrtibute of photosynthate ,and can raise the use efficiency of water and fertilizer.