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利用不同类型水稻品种和组合 ,采用根箱钉板法研究了全量根系在土壤中纵向和横向的分布特征。结果表明 ,根系生物量的 5 2 %～ 6 3%分布在 0～ 12cm土层中 ,70 %～ 79%分布在 0～ 2 4cm土层中。后期耐早衰的协优 930 8表现根系生物量大 ,深根系比例高。根系横向分布随土壤深度增加 ,趋向离开植株中心分布。根系重量密度以表层最高 ,并随深度增加逐渐下降。协优 930 8在表土层以下的根系重量密度比其他品种明显提高。
The root and shoot nailing method was used to study the distribution characteristics of total root system in the soil in both vertical and horizontal directions using different types of rice varieties and combinations. The results showed that 5 2% ~ 6 3% of root biomass distributed in 0 ~ 12 cm soil layer and 70% ~ 79% distributed in 0 ~ 2 4 cm soil layer. Postponed early pro-poor Xieyou 930 8 showed that the root biomass was high, and the proportion of deep roots was high. The horizontal distribution of roots tends to leave the center of the plant with the increase of soil depth. The root weight density of the surface layer of the highest, and gradually decreased with increasing depth. The root weight density of Xieyou9308 below the topsoil obviously increased compared with other varieties.