关键词: 海面温度, 人类活动, 珊瑚礁, 生态影响, 涠洲岛

Abstract: Taking salttolerant cucumber (Cucumis sativus L.) variety ‘Xintai Mici’ as test object, a water culture experiment was conducted to study the effects of foliar spraying Ca(NO₃)₂ on leaf reactive oxygen species (ROS), antioxidant enzyme activities, antioxidants, and membrane proton pump activity of cucumber seedlings under the stress of 65 mmol NaCl·L^-1. Under this stress, foliar spraying Ca(NO₃)₂ decreased the O₂^- production rate and MDA content, and increased the APX and DHAR activities, AsA content, AsA/DHA and GSH/GSSG ratios, and membrane H⁺-ATPase and H⁺-PPase activities significantly, suggesting that exogenous Ca could mitigate the oxidative damage induced by salt stress, and enhance the salt-tolerance of plants through up-regulating the plant antioxidant ability and ion compartmentation.

Key words: Sea surface temperature, Mankind activities, Coral reef, Ecosystem influence, Weizhou Island