摘要
运用挖掘法对黄土高原果园种植牧草根系特征进行了研究，结果表明，小冠花、鸡脚草、百脉根、白三叶、红三叶根系生物量和根长随深度均呈指数减少，0～20cm土层为各牧草根系生物量和根系密集分布区，小冠花和百脉根根系生物量消减系数较大，具有较深根系特点，而鸡脚草、白三叶和红三叶消减系数较小，与果树根系基本呈镶嵌分布。0～20cm土层为各牧草有效根集中分布区，是各牧草水肥利用的主要区域。
The root system distribution characteristics of several herbage species growing in apple orchard of Loess Plateau were surveyed by excavating method. The results showed that both root biomass and root length of Tri foliurn pratense, Coronilla varia, Lotus cornculatus, T. repens and Dactylis glomerata all decline exponentially with soil depth. The main root distribution of the herbage species mentioned above were within 0-20 cm soil layer. The extinction coefficient of root biomass of C. varia and L. cornculatus were bigger, indicating they have deep roots, while the extinction coefficient of root biomass of D. glomerata, T. repens and T. pratense were smaller, indicating they have few deep roots. The concentrating distribution of active root of all herb- age species mentioned above occurred within 0-20 cm soil layer, indicating where was the main area of water and fertilizer used by all herbage species mentioned above. The results suggest that D. glomerata, T. repens and T. pratense which had shallow root system would be chosen as the herbage species growing in apple orchard of Loess Plateau.
出处
《草业学报》
CSCD
2008年第2期92-96,共5页
Acta Prataculturae Sinica
基金
国家“十一五”科技支撑计划2006BAK02A24
陕西省重大科技创新计划2006ZKC(一)05-1资助
关键词
果园生草
根系
黄土高原
苹果
growing herbage in orchard
root system
Loess Plateau
apple
