间作对水稻根系分布特征的影响*

 通过田间试验，研究了两种水稻品种黄壳糯与合系41间作条件下的根系分布特征。结果表明：间作黄壳糯的根深指数显著高于单作，较单作提高49%。合系41第1行的根深指数显著高于第2行和第3行，分别比第2行和第3行高了26.7%和24.9%，且第2行和第3行之间的根深指数无显著差异。间作黄壳糯产量较单作黄壳糯呈增加趋势，但未达显著差异。合系41第1行的产量显著低于第2行、第3行及合系41单作的产量,分别低了23.7%，24.6%和24.6%,但合系41间作第2行、间作第3行与合系41单作之间的产量无显著差异。本试验应用Sufer软件绘制的根系分布图表明：合系41第1行表层根密度较小，下层根密度较大，根系总量显著减少；单作黄壳糯根系呈两边伸展，而间作黄壳糯根系则深层次分布较多。

Effects of Rice Cultivars Intercropping on Root Distribution Characters

Field experiment was conducted to study root distribution characters under Huangke-nuo and Hexi-41 rice intercropping system.The results showed that root depth index of intercropping Huangke-nuo was dramatically higher than that monocropping.The root depth index of intercropping was increased 49% more than monocropped.As for Hexi-41,root depth index of the first row was significant higher than those of the second and the third one,the percentage is 26.7% and 24.8%,and there were not significant different between the second row and the third row.The yield of huangke-nuo intercropping was presented increasing trend than the monocropped huangke-nuo,but there was not significant difference.The yield of the first row of Hexi-41significant lower than the second row,the third row and the monocropped respectively,the percentage is 23.7%,24.6%and 24.6%.But the yield of the second row,the third row of the Hexi-41 intercropped and the Hexi-41monocropped were not significant difference.The results from the Sufer soft analysis showed that root density in surface layer of the first row of Hexi-41 was relatively less,but in the bottom layer was higher,the total amounts of the roots were remarkable decreased with intercropping treatment.The root of the monocropped huangke-nuo was stretched toward the both sides,but the depth of the root of the intercropped Huangke-nuo was more deeper and the distribution of layers widely.