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作者	单位
陈猛，梁雪齐，李玲，张丽，张锋，陈国栋，吴全忠，翟云龙	（塔里木大学植物科学学院，新疆阿拉尔 843300）

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中文摘要:

为探究匀播冬小麦对种植密度的响应，以不同穗型品种新冬22（A₁）和新冬50（A₂）为材料，匀播（株行距相等）条件下设置了123万、156万、204万、278万、400万株·hm^-2（分别记为M₁、M₂、M₃、M₄、M₅）5个种植密度，研究了不同种植密度下匀播小麦干物质积累、运转、产量及其构成因素的差异。结果表明，匀播条件下，冬小麦抽穗前干物质积累量随种植密度的增加而增加，抽穗后干物质积累量随种植密度增加先增加后降低；新冬22号花后干物质积累量、花后干物质对籽粒产量贡献率、籽粒产量均表现为M₂处理最高，新冬50号花后干物质积累量、花后干物质对籽粒产量贡献率、籽粒产量均表现为M₄处理最高。随着种植密度的增加，两个品种的有效穗数呈增加趋势，穗粒数、千粒重呈下降趋势，籽粒产量呈先升后降趋势。匀播条件下，多穗型品种新冬22号适宜种植密度为156万株·hm^-2，大穗型品种新冬50号适宜种植密度为278万株·hm^-2。

英文摘要:

In order to explore the response of uniformly sown winter wheat to planting density,a multiple spike type variety Xindong 22(A₁) and a large spike type variety Xindong 50(A₂) were used as materials,and five plant densities were set up:123(M₁),156(M₂),204(M₃),278(M₄) and 400(M₅) plants per square meter. The two wheat varieties were uniformly sown in the field,and the dry matter accumulation,translocation,grain yield and its components were determined. The results showed that different winter wheat varieties responded differently to planting density. The dry matter accumulation of the two varieties before heading increased with the increase of planting density. The dry matter accumulation after heading increased first,then declined,reaching the maximum under A₁M₂ and A₂M₄ treatments. Xindong 22 achieved the highest dry matter accumulation after anthesis,the dry matter contribution rate to the grain after anthesis,and grain yield under M₂ treatment. Xindong 50 achieved the highest dry matter accumulation after anthesis,the dry matter contribution rate to the grain after anthesis,and grain yield under M₄ treatment. With the increase of planting density,the number of effective ears increased; the grain number per ear and 1 000-grain weight declined,and the grain yield showed a trend of first increasing and then decreasing. Under the conditions of uniform sowing,the suitable planting density for the multi-panicle type Xindong 22 was 1.56 million plants·hm^-2,and that for the large-panicle type Xindong 50 was 2.78 million plants·hm^-2.

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