土壤水分变动对冬小麦干物质分配及产量的影响

以冬小麦品种北农6号为材料，采用温室管栽试验，研究了土壤水分变动条件对冬小麦干物质增长分配率及产量的影响。结果表明，水分胁迫①致使植株的干物质螺 积减少，产量降低，②对叶片干物质累积的影响大于茎鞘，③对穗干物质累积的影响小于茎鞘的叶片，因此，水分胁迫促进了光合向籽粒的调运。复水后，植株各器官的干物质累积和产量都有不同程度的提高，形了适应新水分条件条件的根、冠结构和功能，但是不同时期恢复供水，对植株各器高干物质增和产量形成的促进作用有所不同，拔节期复水对根重，叶重和穗重增长的促进作用都很大，其产量也是所有复水处理中最高的。

Effect of Fluctuated Soil Water Condition on Dry Matter Allocation and Grain Yield in Winter Wheat

Greenhouse experiments were carried out with wheat (BeiNong 6). The effect of soil water fluctuation on dry matter allocation and grain yield in winter wheat were studied. The results indicated that water stress decreased dry matter accumulation and grain yield of winter wheat, larger effect on the leaf dry matter accumulation than that of the stem, with the lest effect on the spike dry matter accumulation. Water stress promoted allocation of photosynthetic product to the seed. Rewatering increased dry matter accumulation of each plant organ and grain yield to a varied extent, forming a new root and shoot system. But rewatering during different growth period had a different effect on dry matter accumulation of each plant organ. Rewatering during jointing stage had the largest effect on root, leaf, spike dry matter accumulate and gain yield.