---

作 者 ：魏孝荣1;郝明德2;邱莉萍1

期 刊 ：植物营养与肥料学报 2004年 10卷 3期 页码：255-258

关键词：土壤干旱；锰；夏玉米；光合特性；

Keywords:soil drought, manganese, summer maize, photosynthesis performance,

摘 要 ：在盆栽条件下进行了土壤干旱时夏玉米施用微量元素锰的试验。通过测定拔节期玉米叶片气孔导度(Cs)、细胞间隙CO₂浓度(Ci)、蒸腾速率(Tr)、光合速率(Pn)和水分利用效率(WUR)等指标,探讨了干旱胁迫下外源锰对夏玉米光合特性的影响。结果表明,施用锰肥能降低光合作用的气孔限制和非气孔限制,显著提高夏玉米光合能力。锰肥对夏玉米光合作用的影响在土壤干旱时尤为显著。土壤干旱情况下,锰肥可使玉米叶片Cs增加58.11%,Pn和WUR分别增加42.07%和50.00%,从而减轻了土壤干旱对玉米光合作用的抑制。

Abstract:An experiment was conducted to study the effects of manganese fertilizer on maize photosynthetic response. The stomatal conductance(Cs), intercellar CO₂ concentration(Ci), transpiration rate(Tr), and net photosynthetic rate(Pn) were measured and water use efficiency was calculated by following formula: WUE=Pn/Tr. The results showed that application of manganese fertilizer lessened the stomatal and non-stomatal limitation on maize photosynthesis performance. Manganese fertilizer made the Pn increase significantly compared with control treatment, especially in soil drought treatments. Under soil drought conditions, the Cs, Pn, and WUE increased by 58.11%, 42.07% and 50.00%, respectively, in manganese treatments. These results indicated that application of manganese fertilizer alleviated the inhibition of soil drought on maize photosynthesis.

---