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采用剖面法对青海共和盆地中间锦鸡儿(Caragana intermedia)人工林的根系进行调查,分析5a、9a和25a根系的生物量、比根长和根长密度的垂直分布格局,同时测定土壤含水量的垂直变化。结果表明:①不同林龄中间锦鸡儿人工林的吸收根(d≤1mm)和输导根(d>1mm)的主要分布范围不同。5a、9a和25a吸收根主要分布土层分别是10～30、10～50cm和10～60cm,输导根主要分布土层分别是10～50、10～60cm和10～90cm。②随着林龄的增加,根系的吸收根、输导根的总生物量、总比根长和总根长密度均显著增加(P<0.05);各林龄根系中的吸收根比输导根具有更高的比根长和根长密度(P<0.05)。因此,吸收水分和养分的能力随着林龄增加而增大。③中间锦鸡儿人工林根系,尤其是吸收根的分布影响土壤水分变化,吸收根集中分布土层的土壤含水量显著降低。
The root system of Caragana intermedia plantations in the middle part of the Qinghai Gonghe basin was investigated by cross-sectional method. The vertical distribution patterns of biomass, specific root length and root length of roots in 5 a, 9 a and 25 a were analyzed. Simultaneously, the soil water content Vertical change. The results showed that: ①The main distribution range of root (d≤1mm) and root (d> 1mm) of Caragana microphylla plantations with different ages were different. The main distribution of soil layers in roots 5a, 9a and 25a were 10 ~ 30, 10 ~ 50cm and 10 ~ 60cm, respectively. The main distributing soil layers of guide root were 10 ~ 50, 10 ~ 60cm and 10 ~ 90cm, respectively. ② With the increase of age, the total root biomass, total root length and total root length of roots increased significantly (P <0.05). The root absorption ratio at different ages Roots had higher specific root length and root length density (P <0.05). Therefore, the ability to absorb water and nutrients increases with age. ③ The root system of Caragana intermedia, especially the absorption root distribution affected the soil moisture change, and the soil moisture content of the absorbed soil with concentrated root distribution decreased significantly.