晋西北黄土丘陵区柠条锦鸡儿根系分布特征

以晋西北黄土高原10年生独生和簇生两种生长方式的柠条锦鸡儿(Caragana korshinskii Kom.)为研究对象,采用完全开挖采集根系的方法对不同土层深度内现存不同径级根系生物量、根长密度及比根长进行了研究。结果表明,独生根根系生物量、根长密度及比根长均高于簇生根,根系生态型是影响柠条锦鸡儿根系特征的根本原因。土壤资源的异质性是导致柠条锦鸡儿在土壤垂直方向上调整根系的形态和数量的主要原因。独生根根系较大的根长密度与比根长,具有更高的种内竞争力,提高了其适应环境的机制,比簇生根有更好的改良土壤、涵养水源与保持水土效应。

Root Distribution Characteristics of Caragana korshinskii in the Loess Hilly Area of Northwestern Shanxi Prov- ince

We studied the difference of Caragana korshinskii Kom.root system distribution characteristics between the single root and the cluster root in a 10-a old plantation in the Loess Plateau area of Northwest Shanxi , China.By taking root total bio-mass (RTB), root length density (RLD), and specific root length (SRL) as basic parameters, we analyzed the character-istics of roots by whole plant excavations based on selection of representative plant samples .The RTB, RLD and SRL of single roots were more than that of cluster roots .Root ecotype was the key cause of affecting the roots characteristics of C. korshinskii.Heterogeneity of soil resources was the main reason of leading C.korshinskii to adjust the morphology and the number in the vertical direction to capture soil resources .There were larger RLD and SRL of the single root , and its in-traspecific competition and environment adaptation mechanism were higher than those of the cluster root .The single root has better effect of improving the quality of the soil and water resource conservation .