水稻超高产栽培的双层源库关系的研究

 为研究光合生产与矿质营养的双层源库关系，设计了窄密沟与平作两种土壤环境，无N、150 kg N/hm²、225 kg N/hm²三个N肥水平的处理，研究了光合生产、矿质营养和两者的双层源库关系。结果表明：根系发育与分布在双层源库间起着承上启下的作用。土壤水分环境改善可同步促进根系发育和下伸、土壤N矿化和植株N吸收。植株吸收N能力的增强，使施N吸收效率提高；但要提高施用N的产量效率，还需提高吸收N的利用效率。为此，改善地上部群体配置，对光合生产与矿质营养的双层源库关系协调发展有重要意义。

Study on Relationship of Double Layer's Source-Sink for Rice Super-High Yielding Culture

In order to research the relationship of double layer's source-sink for both the photosynthetic production and the mineral nutrient, two types of soil environmental treatments, narrow bed with dense ditchs and level paddy field, and three level's nitrogen application, 0 kg N/ha, 150 kg N/ha, 225 kg N/ha, were designed. The development and distribution of rice root system play a role in forming a connecting link between photosynthetic source-sink and mineral nutrient source-sink. The improvement of soil water environment may promote the development and extending downward of rootsystem, mineralization of soil N, and N absorption of plant simultaneously.The efficiency of absorption of applied N increases with the N absorbing ability of the plant, it is necessary to increase the utilization efficiency of absorbed N for further increasing the yield efficiency of applied N. It is important to improve the population structure of canopy in order to obtain a harmonious development of double layer's sourcesink.