Abstract: With japonica rice Wuyunjing 7 and indica rice Fengyouxiangzhan as test materials,effects of row-spacing on morphological and eco-physiological characteristics of rice were studied.The yield of medium row-spacing treatment(30 cm×13.3 cm) was the highest,while that of narrow row-spacing(20 cm×20 cm) was the lowest,with a significant difference at 0.05 level.Medium row-spacing treatment significantly diminished internode length and enhanced internode thickness,wall thickness,the number of vascular bundles of internode,and the lodging resistance compared to wide row-spacing(40 cm×10 cm) and narrow row-spacing treatments.The content of dry matter in basal internode at the heading stage and the 20th day after heading,and the amount of dry matter transferred to grain at the filling stage were the highest at the medium row-spacing treatment.Moreover,there were appropriate leaf area index and higher photosynthetic rate of flag leaf at medium row-spacing treatment.Furthermore,the distinctive differences were found in the content of CO2,light intensity,air temperature and humidity in the population among different row-spacing treatments,and medium row-spacing treatment showed ideal microclimate within the population of rice.It clearly suggested that medium row-spacing treatment is necessary for high-yielding cultivation of rice.

Key words: rice, row-spacing, morphological characteristics, physiological characteristics, microclimate

摘要： 以籼稻品种丰优香占和粳稻品种武运粳7号为材料，研究了不同行株距配置对茎秆形态生理与群体生态的影响。结果表明，中等行距（30.0 cm×13.3 cm）处理的产量最高，窄行距产量最低，差异显著(P<0.05)。中等行距配置较宽、窄行距处理显著减少了节间长度，增加了节间粗度、茎壁厚度及维管束数目，植株抗折力得到明显的提高，差异达显著水平(P<0.05)；中等行距处理下水稻茎秆在齐穗期和灌浆后期单位长度节间干物质含量及灌浆期干物质转运量最大。此外，中等行距配置群体具有适宜的叶面积指数和较高的剑叶光合速率；不同行距配置群体内部CO2浓度、光照强度、温度和湿度等微气象因子具有一定差异，中等行距配置具有良好的群体微气象环境。阐述了适当扩大行距是水稻高产的必备条件。

关键词: 水稻, 行株距配置, 形态特性, 生理特性