中文摘要：

选择山西省吕梁山脉北端芦芽山沿7个海拔梯度测定了林线树种白杄（Picea meyeri）各组织非结构性碳水化合物（NSC）及其组分含量和全氮含量.结果表明：白杄各组织氮含量均表现出随海拔升高而增加的趋势（茎干除外）;NSC含量均随海拔升高而增加,木质化组织中的可溶性糖与淀粉质量比也表现林线高于中低海拔;除茎干外,各组织NSC-N质量比则表现出随海拔升高先减小后增加的趋势.研究表明,氮含量和NSC含量没有限制芦芽山林线树木的生长和发展,即林线树木不存在氮受限和碳限制.

英文摘要：

Carbohydrate and nitrogen supply conditions of alpine trees,and their relationship with timberline formation are investigated.Concentrations of tissue NSC and components,total nitrogen of Picea meyeri along seven elevational gradients from the lowest elevation to alpine timberline at the end of growing season on the north slope of Luya Mountain,Shanxi,China were studied.Total nitrogen concentration showed an increasing trend with elevation in all tissues（except stem）.NSC contents in all tissues increased significantly with elevation,and the soluble/starch ratio in lignified tissues were also higher in timberline trees than in lower elevation trees.Except stem,NSC-N ratio in all tissues initially decreased,but then increased with elevation.Nitrogen and NSC contents therefore do not limit growth and development of trees studied at the timberline of Luya Mountain;there was no nitrogen and carbon limitation at alpine timberline.