【摘要】 为了解CO₂浓度升高条件下马铃薯生长动态及其产量、品质的变化特征，在典型半干旱区（甘肃定西）利用开顶式气室（OTC）试验平台，以马铃薯‘新大坪’为供试品种，设对照(390μmol·mol^-1)和590μmol·mol^-1共2个CO₂浓度梯度，开展CO₂浓度增加模拟试验。结果表明：CO₂浓度增加至590μmol·mol^-1时，马铃薯发育加快，生育期提前，全生育期天数缩短3 d; CO₂浓度升高对马铃薯株高、叶面积指数、叶绿素含量和叶片水势有明显促进作用。随着生育进程的推移，马铃薯地上部干物质生产对CO₂浓度的响应值呈现先变大再变小的趋势。CO₂浓度增加促进了马铃薯块茎产量的提高，单株结薯数和单株薯块质量也有所增加。与对照相比，590μmol·mol^-1CO₂处理马铃薯块茎水分、蛋白质、维生素C含量以及铁、锌、铜元素含量分别下降3.43%、11.78%、13.09%、25.58%、31.94%和9.76%,而粗淀粉、粗脂肪、粗纤维和还原糖含量分别增加10.56%、240.00%、14.28%、106.38%。更多还原

【Abstract】 In the present study, the effects of elevated CO₂ concentration on growth dynamics, yield and quality of potato ‘Xindaping’ were investigated based on the Open-Top Chamber（OTC） experiment platform in Dingxi, a typical semi-arid area. Two different CO₂ concentrations experiments(390 μmol·mol^-1 and 590 μmol·mol^-1) were conducted. The results showed that under the elevated CO₂ concentration(590 μmol·mol^-1), the growth and development of potato were accelerated, and the whole growth period was shortened by 3 days. The elevated CO₂ concentration obviously promoted the increase of plant height, leaf area index, chlorophyll content, and leaf water potential of potato. During the plant growth, the response value of aboveground dry matter production of potato to CO₂ concentration showed a trend from small to large, and then from large to small. The elevated CO₂ concentration promoted potato tuber yield in semi-arid area, accompanied by the increase of the number of tubers per plant and the weight of tubers per plan. Under the elevated CO₂ concentration(590 μmol·mol^-1), the nutrients in potato tubers, such as moisture, protein, vitamin C, as well as trace elements such as iron, zinc and copper decreased by 3.43%, 11.78%, 13.09%, 25.58%, 31.94% and 9.76% respectively. However, the nutrients such as crude starch, crude fat, crude fiber and reducing sugar increased by 10.56%, 240.00%, 14.28% and 106.38% respectively.更多还原