海拔对高寒草甸25种植物种子中主要营养成分含量的影响

he conponents and contents of main seed reserves are very important to seed germination and subsequent seedling establishment. The different seed germination and seedling growth strategy might be shaped by the difference in contents of seed reserves due to their different functional effect. In this study, the main reserve contents changed between high and low altitude in 25 species from the northeast Qinghai-Tibet plateau was analyzed, which could provide a theoretical basis for adaptability of alpine plants. The content of crude fats was determined by Soxhlet extraction with petroleum(60-90℃)as solvent for 8 hours; the content of soluble sugar and starch were determined by anthrone colorimetric method; protein values were obtained by Coomassie Brilliant Blue G-250. The results showed that: the content of crude fats and the content of soluble sugar were higher at the higher altitude, the content of protein was lower at the higher altitude, however, the content of starch was not changed between lower and higher altitude. Because temperature was decreased with increasing altitude, relative higher percentages of fat and soluble sugars in seeds at higher altitude might provide enough energy for seed germination and initial growth of seedlings.