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作者	单位
王雪莱，郭潇潇，郭伟，于崧，薛盈文，于立河	（黑龙江八一农垦大学农学院/黑龙江省现代农业栽培技术与作物种质改良重点实验室，黑龙江大庆 163319）

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中文摘要:

为了解种植密度对松嫩平原西部地区燕麦产量形成的影响，以裸燕麦品种白燕2号为试验材料，设置300万、450万、600万、750万、900万、1 050万株·hm^-2共6个种植密度，分析了不同种植密度下燕麦植株形态、群体质量、干物质积累、籽粒灌浆特性及籽粒产量的差异。结果表明，随种植密度的增加，燕麦的株高和茎粗均显著降低；各生育时期燕麦群体总茎数均随种植密度的增加而增加，各生育时期分蘖数和单株干物重随种植密度增加均呈降低趋势。群体干物重在分蘖期至孕穗期随种植密度的增加而增加，在开花期和成熟期随种植密度的增加呈先升高后降低的趋势，峰值均为750万株·hm^-2群体；不同种植密度下，燕麦籽粒灌浆过程均呈“S”型曲线变化，其Logisitic方程的决定系数在0.997 8~0.998 3之间，均达极显著水平，方程拟合效果较好。种植密度显著影响籽粒产量形成。随着种植密度的增加，籽粒灌浆速率和千粒重均呈下降趋势，籽粒产量呈先升后降的趋势，以450万株·hm^-2种植密度的产量最高。因此，在松嫩平原西部地区，白燕2号籽粒生产的适宜种植密度为450万株·hm^-2，饲用干草生产适宜种植密度为750万株·hm^-2。

英文摘要:

In order to study the effect of planting density on yield formation of oat in western Songnen plain,a naked oat variety Baiyan 2 was used as the experimental material,and a total of six planting density 300×10⁴,450×10⁴,600×10⁴,750×10⁴,900×10⁴ and 1 050×10⁴ plants·hm^-2 were set up.The effects of planting density on plant morphology, planting quality,dry matter accumulation,grain filling characteristics and grain yield were analyzed.The results showed that the plant height and stem diameter of oat plants decreased significantly with the increase of planting density.The amounts of planting culms of oat increased with the increase of planting density during all growth stages.Tiller number and dry matter weight per plant decreased with the increase of planting density during all growth stages.The dry matter of planting increased from tillering stage to booting stage with the increase of planting density,and increased first and then decreased with the increase of planting density at anthesis stage and maturity stage,and the peak value appeared in 750×10⁴ plants·hm^-2 planting.Under different planting densities,the grain-filling process of oat exhibited an ‘S’ curve change.The grain filling process could be extremely well described by the Logisitic model,since the determination coefficients of Logisitic equation were between 0.997 8 and 0.998 3 at a significant level. planting density significantly affected grain yield formation,and the grain-filling rate and 1 000-grain weight decreased with the increase of planting density.The grain yield increased first and then decreased,and the peak value appeared in 450×10⁴ plants·hm^-2 planting.Therefore,in the western region of western Songnen plain,the appropriate planting density for Baiyan 2 grain production was 450×10⁴ plants·hm^-2,and the appropriate planting density for forage hay production was 750×10⁴ plants·hm^-2.

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