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为了探寻更科学合理的人工林管理措施,以赤峰市敖汉旗黄花甸子流域为研究区,对研究区内风沙土区不同坡位柠条锦鸡儿(Caragana korshinskii Kom)<10 mm的根系分布特征及游离氨基酸含量作了分析。结果表明:(1)同一林龄、不同坡位的柠条锦鸡儿随水平距离和垂直距离的增加均呈现出减小的趋势。(2)不同坡位对柠条锦鸡儿根系游离氨基酸含量的影响较为明显,且根系游离氨基酸含量随坡位的降低而增加。坡下天冬氨酸含量、精氨酸含量、赖氨酸含量、苯丙氨酸含量及氨基酸总和分别是坡上的1.255倍、1.432倍、1.381倍、1.80倍及1.11倍。(3)不同坡位的游离氨基酸总和与柠条锦鸡儿的根系分布特征较为相似,均呈现出坡位越低,游离氨基酸总和含量越高且根系分布越集中的趋势。研究结果可为内蒙古农牧交错带柠条锦鸡儿适生性的研究提供理论依据,为区域植被恢复和生态环境建设提供指导性建议。
In order to explore a more scientific and rational management of plantations, the distribution pattern of root system of Caragana korshinskii Kom <10 mm in different slope positions in aeolian sand area in the study area was studied in the Huanghuadian Sub-basin of Aohan Banner, Chifeng City. And free amino acid content were analyzed. The results showed that: (1) Caragana kusnebergii showed a decreasing tendency with the increase of horizontal distance and vertical distance in the same stand age and slope position. (2) The effect of different slope positions on the content of free amino acids in Caragana korshinskii roots was obvious, and the content of free amino acids in roots increased with the decrease of slope positions. The contents of aspartic acid, arginine, lysine, phenylalanine and amino acids were 1.255 times, 1.432 times, 1.381 times, 1.80 times and 1.11 times higher than that on the slope, respectively. (3) The distributions of free amino acids in different slope positions were similar to those in Caragana korshinskii, and the lower the slope position, the higher the content of free amino acids and the more concentrated root distribution. The results may provide theoretical basis for the study of the fitness of Caragana korshinskii in the ecotone between agriculture and animal husbandry in Inner Mongolia, and provide some guidance for the restoration of regional vegetation and the construction of ecological environment.