戴云山黄山松、马尾松针叶抗氧化酶活性的海拔梯度分布格局

The altitudinal gradient pattern of antioxidant enzyme activity in Pinus taiwanensis and Pinus massoniana needles

以戴云山常见的2种亲缘关系较近的松属植物黄山松（Pinus taiwanensis）与马尾松（Pinus massoniana）为研究对象，探讨这2种植物针叶的抗氧化酶活性沿海拔梯度的差异及其分布规律．结果表明：黄山松、马尾松针叶的丙二醛（MDA）含量差异显著，马尾松MDA含量高于同海拔黄山松．MDA含量沿海拔梯度变化呈现出一定的规律性，在海拔1400～1700m，北坡黄山松MDA含量均高于南坡，随着海拔的升高MDA含量呈先上升后下降的趋势．马尾松、黄山松抗氧化酶活性随海拔的变化情况基本一致，过氧化物酶（POD）、过氧化氢酶（CAT）活性随海拔的升高均呈先上升后下降再增强的趋势；但超氧化物歧化酶（SOD）活性随海拔的升高呈先升高后降低的趋势，而在高海拔处未有明显变化．

To elucidate the mechanism of adaptability to environment for needles,antioxidant enzyme activity of Pinus taiwanensis and Pinus massoniana at different altitude and slope aspect were compared in Daiyun Mountain. Results showed that MDA content of P. massonianawere was significantly higher than those of P. taiwanensis at the same altitude. Malondialdehyde content presented certain regularity along the altitude: MDA contents of P. taiwanensis at the northern slope were higher than those at the southern slope at altitude between 1400 m and 1700 m,after which MDA content increased and then went down. With increased elevation,catalase and peroxidase activities of two plants fluctuated in a similar patttern,which decreased after the first rise,and followed by a second rise to a higher level. Superoxide dismutase activity declined after a initial rise,and remianed at the same level at higher altitude.To summarize,this study provided insight into the mechanism of plant in response to stress and lay a foundation for adaptive strategy to climate change.