不同林龄柠条锦鸡儿土壤全氮的变化

Changes of Caragana korshinskii Kom Lam. Soil Total Nitrogen in Different Stand Ages

[目的]研究半干旱区不同林龄柠条锦鸡儿人工林土壤全氮变化。[方法]通过野外调查和室内分析相结合的方法,对内蒙古赤峰市敖汉旗风沙土区不同林龄柠条锦鸡儿(5、11、17、23及29年)不同土层的土壤全氮作了分析。[结果]同一立地条件同一林龄柠条锦鸡儿土壤全氮含量随土层厚度的增加呈现先增加后减小的趋势;同一林龄不同立地条件柠条锦鸡儿土壤全氮含量从大到小依次为丘间低地、阴坡、阳坡;同一立地条件不同林龄条件下柠条锦鸡儿土壤全氮含量随林龄的增加大体呈现逐渐增加的趋势。[结论]在一定范围内,土壤全氮的含量随着林龄增加而增加。

[ Objective ] Changes of Caragana korshinskii Kom Lam. soil total nitrogen in different stand ages were studied. [ Method ] In this paper through the field investigation and indoor analysis, different forest age of C. korshinskii Kom Lam. （5, 11, 17, 23 and 29 a） soil total ni- trogen in different soil layer at Chifeng City Aohan sand soil area were analyzed. [ Result ] Analysis showed that： （1）soil total nitrogen content showed a trend of decrease after the first increase with the increase of the soil thickness under the same site conditions and the same forest age. （2） on the same plantation age, the order of soil total nitrogen content from large to small was lowland , cloudy slope, sunny slope. （ 3 ） soil total nitrogen content gradually increased with the increase of forest age under the same site conditions on the condition of different forest age. [ Conclu- sion] Within a certain range, the content of total nitrogen in soil increases with the forest age increases.