Development of Caragana Microphylla Seedling Root System in Hilly Regions of Loess Plateau
Development of Caragana Microphylla Seedling Root System in Hilly Regions of Loess Plateau
复制标题
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Lu Qin-an
中科院分区：
文献类型：
--
作者：
Lu Qin-an
对黄土高原陇西丘陵区重要灌木树种小叶锦鸡儿1~3年生幼苗的根系形态、生长发育、分布及根瘤特征进行了研究。结果表明，小叶锦鸡儿主根的生长速度远大于茎的生长速度。根冠比为4~6。侧根主要分布在主根的5~15 cm处。小叶锦鸡儿的根平均向上伸长5 cm。结瘤主要集中在10~30 cm土层的主根和一次分裂的侧根上，生长迅速、发达的根系和根瘤具有良好的抗旱性和改善土壤质量、保持水土的生态功能。与春播相比，秋播更符合当地的光、热、水资源，应在更高的水平上推广。
The major objective of this study was to characterize the root system of the 1～3 year old seedlings of Caragana microphylla,an important shrub species in Longxi hilly region of the Loess Plateau,China.Root morphology,growth and development,distribution and nodule characteristics were determined after excavation.The results show that the growth rate of the major root of Caragana microphylla was much greater than that of the stem.The ratio of root to shoot ranged from four to six.The lateral roots were found mainly on the 5～15 cm section of the major root.The radicles of Caragana microphylla in average elongated 5 cm upward,implying a reasonable sowing depth of 3 cm.The nodules concentrated mainly on the major root and the first-division lateral roots in the 10—30 cm soil layer.The fast-growing,well-developed root system and nodules provided the plant with superior drought resistance and ecological functions of improving soil quality and conserving soil and water.Compared with spring sowing,fall sowing agreed to local light,heat,and water resources better and should be promoted to a higher level.