集雨补灌春小麦花后干物质积累分配及灌浆特性

研究了集雨补灌条件下陇中半干旱区春小麦产量水分效应、开花后干物质积累分配及籽粒灌浆特性。结果表明,集雨补灌对旱地作物具有补偿或超补偿效应,具有明显的增产效应,可提高产量水平、水分利用效率(WUE)及灌水利用效率(IWUE)。孕穗期补灌的WUE最高,而拔节期 孕穗期分期补灌的IWUE最高。经模拟,春小麦的叶、茎、鞘干物质积累动态不同于穗及全株。补灌小麦的干物质积累量、日生产量及相对生长率(RGR)均高于对照。在干物质运转分配方面,补灌小麦较之于对照表现为移动量大,转换率高。补灌延长了春小麦灌浆持续期及提高了平均灌浆速率。

Accumulation and Distribution of Dry Matter and Grain filling of Spring Wheat Postanthesis under Supplementary Irrigation Catchment Rainfall

Yield and water effect, accumulation and distribution of dry matter and grain filling of spring wheat after flowering under supplementary irrigation with catchment rainfall were studied at the trial station of Dingxi county in semiarid area of central Gansu. The results of experiment showed that there were it has improved the level of yield ,WUE and IWUE of spring wheat under supplementary irrigation(SI),and there were compensation or over-compensation effect for dry land farming crop. There were highest WUE at jointing stage, and highest IWUE at jointing booting stage. Accumulation and distribution dynamics of dry matter of leafs, stems and sheathes differed from those of spikes and all plants. Accumulation, output per day and RGR of spring wheat under SI were higher than that of CK. Moreover grain filling continuance and average grain filling of wheat were improved under SI.