植物营养元素的含量和δ^(13)C值随海拔而变化的特征及营养元素相互作用对碳同位素分馏作用的影响

ALTITUDINAL VARIATIONS OF NUTRIENT CONCENTRATIONS AND CARBON ISOTOPE COMPOSITIONS IN A C_3 PLANT AND THE EFFECTS OF NUTRIENT INTERACTIONS ON CARBON ISOTOPE DISCRIMINATION IN LIMESTONE AREAS OF SOUTHWEST CHINA

为了研究植物营养元素的含量和δ^(13)C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C_3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δ^(13)C值会增大,其变幅为+2.4‰/1000m。

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 correlat...