摘要
选择9个水稻品种,在水稻生长根系最旺盛的抽穗期进行取样,研究高产水稻群体的根系空间分布特征.结果表明:不同水稻品种的根系体积和质量的总量存在差异.各品种水稻根系的体积和质量均随土层深度增加而下降,但主要分布在土壤耕作层(0～20cm),且表层(0～10cm)占80%以上.其垂直分布可用指数模型、乘幂模型、对数函数、多项式函数表示,相关系数都在0.9以上.上层根(0～10cm)质量与产量之间没有显著的相关关系,而下层根质量(10cm以下)与产量之间呈显著正相关关系,相关系数达0 7258.研究认为,从整株根系和高产的角度来看,适当减少表层根系,培育和增加深层根系的比例有利于促进水稻产量的提高.
Nine typical varieties were selected to study the spatial distribution of rice root system. The results showed that difference of dry mass and volume of root system existed among these varieties. The root mass decreased with the increase of soil depth. The root system was mainly distributed in the tillage layer(0-20 cm), especially in surface soil layer(0-10cm). More than 80% of the root system was at this layer. The vertical distribution of root mass and root volume could be expressed by exponential equation, power equation,logarithmic equation and polynomial equation, respectively. All coefficients of the correlation were more than 09. However, exponential equation was the best. The upper layer root mass has no significant correlation with yield, but lower layer(≥10 cm) root mass had significant positive correlation with yield, the coefficient of correlation was 0725?8. It implied that adequate reduction of surface layer root system and the increase of the deep root system were beneficial to rice yield.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2003年第3期1-4,共4页
Journal of South China Agricultural University
基金
国家自然科学基金资助项目(39770138和30100107)
教育部博士点基金资助项目(2000065402)
广东省自然科学基金资助项目(980145和20000636)
