关键词: 柠条锦鸡儿, 游离氨基酸含量, 根系特性, 坡位, 内蒙古农牧交错带

Abstract: In order to explore scientific and reasonable man-made forest management measure, this paper took aeolian sandy soil area in Aohan Banner, Chifeng city as research object, studied and analyzed the fine roots distribution characteristics and free amino acid content of Caragana korshinskii Kom ＜10 mm at different slope. The results showed as follows: ①the total length of Caragana korshinskii Kom fine root presented a decreasing tendency as the vertical distance and horizontal distance increased. ②The free amino acid content of Caragana korshinskii Kom fine root showed a big difference at different slope position. The lower the slope position was, the higher content of free amino acid the fine root was. The aspartic acid, arginine acid, lysine acid, phenylalanine and total acid contents below the slope were  1.255, 1.432, 1.381, 1.80, 1.11 times of that on the slope, respectively. ③The total free amino acid contents of Caragana korshinskii Kom fine root at different slope position and characteristics of root distribution were similar. The lower the slope position, the higher the total free amino acid content, and more concentrate of root distribution. These results could provide theoretical basis for studying adaptability of Caragana korshinskii Kom, and guiding suggestions for vegetation recovery and ecological environmental construction in this area.

Key words: Caragana korshinskii Kom, free amino acid content, root system characteristics, slope position, agro-pasture crossing zone in Inner Mongolia