于2006—2008年进行冬小麦田间试验，设置行距×株距分别为：7 cm×7 cm（A）、14 cm×3.5 cm（B）、24.5cm×2 cm（C）、49 cm×1 cm（D）4种群体分布方式，每种分布方式设4种灌溉处理：整个生育期内不灌溉，灌拔节水，灌拔节和抽穗水，灌拔节、抽穗和灌浆水（每次灌水量相同，均为0.60 m3），研究在同一群体密度(2.04×106 株·hm-2)下不同群体分布和灌溉对冬小麦光能利用状况的影响及其在生产中的利用价值.结果表明：A、B处理的群体分蘖数和叶面积指数（LAI）显著高于C、D处理；随着行距的加大，光合有效辐射（PAR）透射率逐渐增多，而PAR截获率呈下降趋势；增加灌溉可提高冬小麦群体单茎数和LAI，降低PAR透射率，从而明显提高了PAR总截获率.冠层内PAR截获率表现为上强下弱的趋势，相对均匀的群体分布和所有灌溉处理均显著增加了冠层40 cm以上的PAR截获率.冬小麦光能利用率（RUE）随行距增大而逐渐降低，其中，A、B、C、D处理总RUE两年的均值分别为1.24%、1.27%、1.21%和1.06%，B处理较C、D处理分别提高了5.21%和19.56%，差异显著.群体分布相对均匀的A、B处理可显著改善冬小麦群体结构和PAR截获状况，有利于充分利用光能；所有灌溉处理也可影响群体结构，进而明显提高作物的RUE.
A field experiment was conducted in 2006〖KG-*2〗-〖KG-*7〗2008 to study the effects of different population distribution pattern and irrigation schedule on the radiation utilization in a winter wheat farmland at the same population density (204×106 plant·hm-2). Four population distribution patterns were designed, i.e., row spacing (cm) × plant spacing (cm) 7×7 (A), 14×3.5 (B), 24.5×2 (C), and 49×1 (D), and each pattern had four irrigation schedules, i.e., no-irrigation, irrigation at jointing stage, irrigation at jointing and heading stages, and irrigation at jointing, heading and filling stages. The irrigation amount was 060 m3 each time. In the patterns A and B, the tiller number and leaf area index (LAI) were significantly higher than those in C and D (P<005). With the increase of row spacing, the photosynthetically active radiation (PAR) transmittance ratio increased gradually, while the PAR capture ratio had a decreasing trend. Increasing irrigation times increased the tiller number and LAI, but decreased the transmittance ratio of PAR, resulting in a significant increase of PAR capture ratio (P<005). The PAR capture ratio in the crop canopy was higher in upper layers, compared with that in lower layers. Relatively uniform population distribution and irrigation increased the PAR capture ratio in the upper 40 cm canopy layers significantly. The radiation use efficiency (RUE) decreased with increasing row spacing, with the two year‘s average total RUE in A, B, C, and D being 124%, 127%, 121% and 106%, respectively, and that in B was 521% and 1956% higher than that in C and D, respectively, with the difference being significant. It was suggested that relatively uniform population distribution improved the winter wheat population structure and PAR capture, being beneficial to the fully use of radiation, and irrigation also had positive effects on the population structure, being helpful to the increase of crop RUE.