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作者	单位
霍李龙，苗芳，贾丽芳，王长发	(1.西北农林科技大学农学院，陕西杨凌 712100 2.西北农林科技大学生命科学学院，陕西杨凌 712100)

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中文摘要:

为优化配置关中灌区冬小麦种植方式，以小偃22、周麦18和西农805为试验材料，采用二因素随机区组设计，研究宽窄行（B1，30 cm+16 cm）和等行距（B0，23 cm+23 cm）种植方式对关中灌区小麦冠层光合及产量性状的影响。结果表明，与B0相比，B1处理对各小麦品种均有增产效果，其中，小偃22和西农805达到显著水平。B1较B0处理，各品种的有效穗数显著提高，小偃22的穗粒数下降不显著，西农805的千粒重显著增加；各品种灌浆期LI显著提高，小偃22和西农805灌浆期的LAI显著提高；小偃22在灌浆前期与灌浆后期的光合指数、周麦18灌浆后期的光合指数显著升高；西农805灌浆前期的光合指数显著降低，而灌浆后期显著升高；小偃22的花前贮藏物质转运量及其对籽粒的贡献率显著提高，西农805花后干物质积累量及其对籽粒的贡献率和西农805的经济系数显著提高，周麦18受种植方式影响较小。综上所述，B1处理能够进一步发挥小偃22和西农805在冠层光截获、同化物质生产、干物质积累与转运、产量构成要素等方面的品种性状优势，从而实现增产。

英文摘要:

In order to optimize the planting patterns for winter wheat in the irrigation area of central Shaanxi,China,three wheat varieties,Xiaoyan 22,Zhoumai 18 and Xinong 805,were employed to investigate the effects of planting pattern with wide and narrow row space alternated(B1,30 cm+16 cm) and with same row space（B0,23 cm+23 cm） on canopy photosynthesis and yield traits of winter wheat using a randomized block design. It was found that wheat varieties tested had higher yields under B1 than those under B0,of which,Xiaoyan 22 and Xinong 805 had significantly higher yields under B1 than those under B0. Xiaoyan 22 and Xinong 805 had significantly higher effective spike number per unit area under B1 than those under B0,and significantly higher canopy light interceptions(LI) and leaf area indexes(LAI) under B1 than those under B0,at grain filling stage. Besides,Xinong 805 and Zhoumai 18 had significantly lower kernel number per spike under B1 than those under B0,but Xiaoyan 22 still kept its kernel number per spike at a high level,and its photosynthesis index was significantly higher than those under B0 at early and late grain filling stages. The pre-anthesis translocation amount of Xiaoyan 22 and the contribution rate of pre-anthesis translocation to grain were significantly increased under B1.Whereas,economic coefficient,post-anthesis accumulation and the contribution rate of post-anthesis accumulation amount to grain of Xinong 805 under B1 were significantly higher than those under B0. Xinong 805 had significantly lower photosynthetic rate under B1 than that under B0 at early grain filling stage,but higher photosynthetic rate under B1 than that under B0 at late grain filling stage. In a word,B1 could bring advantages of Xiaoyan 22 and Xinong 805 in canopy light interception and assimilation,dry matter accumulation and transportation,and yield components,thus increased wheat yield.

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