贡嘎山地区不同海拔冷杉比叶质量和非结构性碳水化合物含量变化

Altitudinal changes in leaf mass per unit area and tissue non-structural carbohydrates content of Abies fabri on Gongga Mountain of Southwest China

以贡嘎山地区磨西山谷东北坡和康定山谷西南坡为样地,研究了高山林线和低海拔冷杉休眠期和生长旺盛期针叶比叶质量和组织非结构性碳水化合物含量.结果表明:生长在温暖湿润的磨西山谷东北坡的冷杉针叶比叶质量和组织非结构性碳水化合物含量均高于炎热干燥的康定山谷西南坡;高山林线冷杉比叶质量大于低海拔冷杉;高山林线冷杉组织非结构性碳水化合物含量总体高于低海拔冷杉,且生长期比休眠期更为显著.研究结果不支持"碳供应不足导致高山林线形成"的假说.

Taking the northeast slope of Moxi vally and southwest slope of Kangding vally in Gongga Mountain of Southwest China as sampling sites, this paper investigated the leaf mass per unit area （LMA） and tissue non-structural carbohydrates content （ NSC ） of Abiesfabri distributed at the positions from lower elevations to alpine treeline during the periods of dormancy and vigorous growth. The results indicated that A. fabri had higher LMA and NSC in warm-moist Moxi valley than in hotdry Kangding valley. The LMA and NSC of treeline trees were all higher than those of the trees at lower elevations, which was more obvious during the period of vigorous growth. The overall ahitudinal changing trends of LMA and NSC in Gongga Mountain of Southwest China did not support the hypothesis of ‘ carbon limitation could induce the formation of alpine treeline＇.