水分胁迫对冬小麦干物质分配的影响

Effects of Water Stress on Dry-matter Distribution of Winter Wheat

[目的]研究不同土壤水分条件下冬小麦的生长发育、各器官的干物质积累动态。[方法]采用盆栽方法,通过设置不同的土壤水分条件,从器官水平考察水分条件对冬小麦物质积累、分配等的影响,并建立产量和耗水量的关系方程。[结果]在水分适宜条件下,茎秆干物质积累所占比例较小,为32%,穗部占39%;而过度灌溉和严重水分胁迫条件下,茎秆干物质积累所占比例较大,分别为43%和34%,穗部所占比例较小,仅为41%和27%。[结论]水分条件对冬小麦生长的拔节至扬花期尤为重要,生产上应特别注意加强扬花期和灌浆期水分管理。

[ Objective ]The research aimed to study the growth and development, each organ＇s dry rmtter accunmlation dynamics of winter wheat under different water stress. [ Method]Different water conditions were set up in pot experiment,and the effects of water stress on the matter accumulation and distribution of winter wheat were reviewed. Then the relation equation between yield and water consumption was established. [ Result ]The results showed that, the proportion of dry-matter distribution in stem was low under the fitting water condition . it was 32% and 39% in spike. But under the condition of high water stress and excessive water ,the proportion of dry-matter distribution in stem became higher and the proportion in spike was lower . Under the condition of high water stress, the proportion in stem was 43% and 34%, and in spike ,it was 41% and 27%. [ Conclusion]The flowering and jointing stages are two periods during which winter wheat is especially sensitive to soil water . Attentions should be paid on management of soil water in the field during the flowering and grain filling stages.