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三个马铃薯(Solanum tuberosum L.)品种在500、1000、1500、2000μmol·mol~(-1)CO_2浓度与16、20℃空气温度下生长35d,测定了植株叶片的比叶重(g·m~(-2))、淀粉浓度及主要养分N、P、K、Ca、Mg的浓度。在16℃和20℃下,叶片淀粉浓度随CO_2浓度的增加而增加,且16℃下的测定值高于20℃下的测定值。比叶重与以叶面积或干重为基础的叶片淀粉浓度成正相关。叶片N、P、Ca、Mg浓度与14％范围内的淀粉浓度成负相关,但与高于14％的淀粉浓度无明显关系。去除淀粉效应后的比叶重及叶片养分浓度呈现类似的变化趋势。然而,不同CO_2浓度下的叶片K浓度相对稳定,因此受淀粉浓度影响较小。研究结果表明,不同CO_2浓度与温度条件下马铃薯叶片的比叶重及N、P、Ca、Mg浓度的变化不完全是叶片淀粉浓度的变化所致。
The three potato (Solanum tuberosum L.) cultivars were grown for 35 days at temperatures of 500, 1000, 1500 and 2000μmol · mol -1 CO 2 and air temperature of 16 and 20 ℃, and the specific leaf mass (g · m ~ (-2)), the concentration of starch and the concentrations of N, P, K, Ca, Mg in main nutrients. At 16 ° C and 20 ° C, leaf starch concentration increased with increasing CO 2 concentration, and the measured value at 16 ° C was higher than the measured value at 20 ° C. Leaf specific gravity was positively correlated with leaf starch concentration based on leaf area or dry weight. N, P, Ca, Mg concentrations in leaves were negatively correlated with starch concentrations in the range of 14%, but not with starch concentrations above 14%. After removing the starch effect leaf specific gravity and leaf nutrient concentrations showed a similar trend. However, leaf K concentration was relatively stable under different CO 2 concentrations and was therefore less affected by starch concentration. The results showed that the changes of specific leaf weight and N, P, Ca and Mg concentrations in potato leaves under different CO 2 concentrations and temperatures were not entirely due to changes in leaf starch concentration.