水稻强化栽培对植株生理与群体发育的影响

 以粳稻品种武香粳9号为材料，研究了SRI（system of rice intensification）下植株生理特性、群体发育特点及高产栽培技术。结果表明，在SRI方式下，水稻根系活力增强，叶片可溶性糖、非蛋白氮、丙二醛和脯氨酸含量增加，营养器官的物质转运率提高，群体质量明显改善；但群体茎蘖数和穗数不足，限制了SRI的产量。在SRI条件下，双本栽插能显著提高水稻群体茎蘖数，改善营养器官物质的运转和群体质量，有助于提高SRI的产量；增施氮肥在提高水稻群体茎蘖数的同时降低了营养器官物质的转运，因此不宜过分依赖增加氮肥来提高SRI的产量。

Effects of SRI Technique on Physiological Characteristics and Population Development in Rice

Rice physiological characteristics and population development under SRI (system of rice intensification) condition were studied by using japonica cultivar Wuxiangjing 9. Results showed that SRI significantly enhanced root activity, increased soluble sugar, non protein nitrogen, proline and malondialdehyde (MDA) contents in leaf, dry matter translocation percentage from vegetative organs to grains, and improved population quality remarkably. Rice yield, however, was limited by lower tiller number and panicle number of plant population. Under SRI condition, planting two seedlings per hill could increase tiller number of plant population, dry matter translocation percentage from vegetative organs to grains and improve population quality, which was in favor of yield increase. With increasing nitrogen rate,tiller number of plant population increased,whereas dry matter translocation percentage from vegetative organs to grains decreased, suggesting yield increase under SRI should not rely on the excess nitrogen rate.