A limnological study was carried out to determine the responses of superoxide dismutase （SOD） activities and soluble protein （SP） contents of 11 common aquatic plants to eutrophication stress. Field investigation ...A limnological study was carried out to determine the responses of superoxide dismutase （SOD） activities and soluble protein （SP） contents of 11 common aquatic plants to eutrophication stress. Field investigation in 12 lakes in the middle and lower reaches of the Yangtze River was carried out from March to September 2004. Our results indicated that non- submersed （emergent and floating-leafed） plants and submersed plants showed different responses to eutrophication stress. Both SOD activities of the non-submersed and submersed plants were negatively correlated with their SP contents （P 〈 0.000 1）. SP contents of non-submersed plants were significantly correlated with all nitrogen variables in the water （P 〈 0.05）, whereas SP contents of submersed plants were only significantly correlated with carbon variables as well as ammonium and Secchi depth （SD） in water （P 〈 0.05）. Only SOD activities of submersed plants were decreased with decline of SD in water （P 〈 0.001）. Our results indicate that the decline of SOD activities of submersed plants were mainly caused by light limitation, this showed a coincidence with the decline of macrophytes in eutrophic lakes, which might imply that the antioxidant system of the submersed plants were impaired under eutrophication stress.展开更多
Since the global economic crisis in 2008,the world’s major economies have experienced a rapid reversal in cross-border capital flow trends,as well as considerable huge changes in related management methods.At the out...Since the global economic crisis in 2008,the world’s major economies have experienced a rapid reversal in cross-border capital flow trends,as well as considerable huge changes in related management methods.At the outset of the crisis,developed countries of Europe and North America attracted less capital inflow from other countries,while capital flooded into emerging markets.Many Asian and Latin American countries took measures to curb capital inflow,for fear that excess capital inflow would put upward pressure on their domestic currency’s exchange rate-something that would,in turn,lead to increases in credit expansion and asset prices.Since 2014,on account of the U.S.economic recovery and an ever-stronger U.S.dollar,several emerging markets have sustained slowed growth and net capital outflows.展开更多
基金Supported by the National Natural Science Foundation of China(30570280)the National Basic Research Program of China(2002CB412300,2002AA601011).
文摘A limnological study was carried out to determine the responses of superoxide dismutase （SOD） activities and soluble protein （SP） contents of 11 common aquatic plants to eutrophication stress. Field investigation in 12 lakes in the middle and lower reaches of the Yangtze River was carried out from March to September 2004. Our results indicated that non- submersed （emergent and floating-leafed） plants and submersed plants showed different responses to eutrophication stress. Both SOD activities of the non-submersed and submersed plants were negatively correlated with their SP contents （P 〈 0.000 1）. SP contents of non-submersed plants were significantly correlated with all nitrogen variables in the water （P 〈 0.05）, whereas SP contents of submersed plants were only significantly correlated with carbon variables as well as ammonium and Secchi depth （SD） in water （P 〈 0.05）. Only SOD activities of submersed plants were decreased with decline of SD in water （P 〈 0.001）. Our results indicate that the decline of SOD activities of submersed plants were mainly caused by light limitation, this showed a coincidence with the decline of macrophytes in eutrophic lakes, which might imply that the antioxidant system of the submersed plants were impaired under eutrophication stress.
文摘Since the global economic crisis in 2008,the world’s major economies have experienced a rapid reversal in cross-border capital flow trends,as well as considerable huge changes in related management methods.At the outset of the crisis,developed countries of Europe and North America attracted less capital inflow from other countries,while capital flooded into emerging markets.Many Asian and Latin American countries took measures to curb capital inflow,for fear that excess capital inflow would put upward pressure on their domestic currency’s exchange rate-something that would,in turn,lead to increases in credit expansion and asset prices.Since 2014,on account of the U.S.economic recovery and an ever-stronger U.S.dollar,several emerging markets have sustained slowed growth and net capital outflows.
