青藏高原不同海拔矮嵩草蛋白质、脂肪和淀粉含量的变异

 生长在青藏高原4个不同海拔地区的矮嵩草(Kobresia humilis)，其蛋白质、脂肪和碳水化合物的含量有明显差异。其中海拔最高的大坂山(4,000m)植株中蛋白质含量平均比海拔依次较低的金羊岭(3,800m)，海北站(3,200m)和西宁地区(2,200m)的分别高出9.9％，17.3％和39.4％；脂肪含量平均分别高出7.1％，77.8％和106.0％；淀粉含量也平均分别高出2.4％，21.6％和32.7％。同时表明，海拔高度对上述若干生化成分含量的季节性动态变化均有明显的影响。从而显示，高海拔地区的植物所以具有较强的抗寒性和适应逆境胁迫的能力，是与体内蛋白质、脂肪和碳水化合物(淀粉)的大量积累增加密切相关。

Contents of Protein, Fat and Starch of Kobresia humilis Plants Grown at Different Altitudes in Qinghai-Xizang Plateau

In this paper, the contents of protein, fat and starch were compared among Kobresia humilis plants grown at different altitude in Qinghai-Xizang plateau (Daban Mt, 4,000 m a.s.1; Jinyang Mt,3,800 m a.s.1;Haibei station, 3,200 m a.s.1;Xining,2,200 m a.s.1). The results show that some biochemical component in aboveground and belowground tissues of the plants tended to increase with increasing altitude. As compared with those plants in Jinyang Mountain, Haibei Station and Xining, on average, the plants grown at Daban Mountain had a higher protein content by 9.9% ,17.3% and 39.4%, a higher fat content by 7.5% ,77.8% and 106.8%, and a higher starch content by 2.4%, 21.6% and 32.7% ,respectively. It is clear that altitude had effects on the seasonal changes of the contents of some biochemical components.The results suggest that the stronger frost resistance of the plants located at a higher altitude are associated with their stronger synthesis of the protein, fat, starch and related substances.