【摘要】 为了研究植物营养元素的含量和δ¹³C值随海拔而变化的相关关系,沿着海拔450 m的贵州茂兰至海拔1330 m的贵州安顺一线,采集和分析研究了C₃植物——小果蔷薇（R.cymosa Tratt）的叶片。分析结果表明,植物叶片中营养元素含量随着海拔的上升而产生的变化是:氮、磷和钾的含量会在增高,而钙和镁的含量却会降低。植物叶片的δ¹³C值会增大,其变幅为+2.4‰/1000m。更多还原

【Abstract】 We collected leaves of C3 plant-R, eymosa Tratt from lower altitude of Molan, 450 m above sea level, to higher altitude of Ansun, 1330 rn above sea level, in limestone areas of southwest China at November 2001, and analyzed nutrient concentrations and carbon isotope compositions. The results showed that two general sets of nutrients can be identified: nitrogen, phosphorus and potassium that were all highly, positively correlated with each other, and calcium and magnesium, which were both negatively correlated with N, P and K. Leaf carbon isotope discrimination was lower at higher altitude than at lower altitude, with the average change amounting to +2.4 per 1000 m of altitude. Those significant relationships between N and δ¹³C values with increasing altitude in C₃ plant were widespread phenomena. The paper reviewed the role of nutrient interactions on photosynthesis and structural functions: Potassium is the important counter ion to calcium; both act as an intracellular regulator but play a different role in stomata] closing and opening. Phosphorus is the important synergistic ion to nitrogen, such interaction may increase photosynthetic capacity through affecting its concentration in photosynthetic enzyme. Therefore, the increasing δ¹³C leaves values with increasing altitude were related to nutrient interactions which were associated with reactions of photosynthesis and structural functions.更多还原