Abstract: Root distribution of rice was studied in 1999-2000, the results showed that the root distribution of different type rice is different. Compared with indica rice, the root system of japonica rice expands deeply into soil, its root dry weight rate below 20 cm depth is more than 15 percent, the root depth index is more than 10, whereas the root dry weight rate below 20 cm depth in indica rice is less than 10 percent, and the root depth index is less than 10. The root distribution of hybrid rice between indica and japonica is similar to that of japonica rice.

Key words: rice, root distribution

摘要： 对不同类型水稻的根系分布进行了比较，研究发现籼型水稻和粳型水稻的根系垂直分布有比较明显的差异，在20 cm以下的根系干物重占总根重的百分比籼型水稻一般在10%以下，而粳型水稻一般高于15%。根深指数对比结果同样表明了这一趋势，粳型水稻的根深指数一般在10以上，而籼型水稻的根深指数一般低于10。上述两个指标均表明，与籼型水稻相比，粳型水稻具有明显的深扎根性。亚种间杂交水稻的根系分布更接近粳型水稻。

关键词: 水稻, 根系分布, 根深指数