Fu Aihong

Analysis on water potential of Populus euphratica oliv and its meaning in the lower reaches of Tarim River, Xinjiang

AbstractsCombined with materials measured on leaves water potential of Populus euphratica oliv in the process of ecological water delivery in the lower reaches of Tarim River, the influence of ground-water depths and soil salinity on leaves water potential of P. euphratica was analyzed. We found that there was evident negative correlation between the leaves water potential of P. euphratica and ground-water depths. The deeper the ground-water depths were, the lower the leaves water potential of P. euphratica was, the more serious drought stress P. euphratica suffered from. Besides, there was evident negative correlation between the soil salinity and the leaves water potential of P. euphratica. The bigger the soil salinity was, the lower the leaves water potential of P. euphratica was, the more serious drought stress was indicated from which P. euphratica suffered. For sections rather distant for Daxihaizi Reservoir as well as for those places of wells rather distant from the river course, ground-water depths and the soil salinity were high; the leaves water potential of P. euphratica was low. The leaves water potential of P. euphratica can reflect the degree at which P. euphratica suffers from drought and salt stress, and has an important reference meaning in analyzing proper ground-water depths for the survival and growth of P. euphratic in the lower reaches of Tarim River.

Water-salt succession patterns(1951 2011) and its response to climate change in Lake Bosten

Lake Bosten is the largest inland freshwater lake of China and plays a key role in the local arid-area ecosystem.The amount and quality of the water Lake Bosten are vital to the people in the oasis based socio-economic system the lake supportted.However,the environmental problems of Lake Bosten emerged are getting worse day by day resulted from the large variation of water level and worse and worse water quality,which were focused by the government and scholars.This study focuses on the dynamics of water-salinity of Lake Bosten in the past 60 years(1951-2011) and their response to climate change,attempted to predict water level and water quality change trend.The results showed that water level of Lake Bosten in 1951-2011 had a significant increasing trend.Step change points in water level were identified in Lake Bosten,which occurred in the years around 1974 and 1994 dividing the long-term water level series into a stable period(1951-1974),a decreasing period(1975-1994) and an increasing period(1995-2011).Water salinity of Lake Bosten also presented three change stages.And the water level and water salinity showed a significant negative correlation,but the water quality change lagged one year compared with the water level.The temperature in Lake Bosten basin had a significant increasing trend,and its step change point occurred in the year around 1993,which was consistent with the run-off in Kaidu River.The correlation between the temperature and water level,water quality in the Lake Bosten is extremely significant.The temperature regulated the water quality and water level of Lake Bosten through changing the lake inflow and evaporation.The water level will have a decreasing trend and water quality will be worse and worse if the temperature maintain continued rising in the future.Therefore,in order to ensure the sustainable development and utilization of the water resources of Lake Bosten,and inhibit the deterioration of water quality,it should be concentrated the diversion time of Lake Bosten from May to September,and strictly controlled the industrial and agricultural water consumption,reduced the emissions of industrial,agricultural and domestic pollution,decreased the amount of surrounding groundwater development.Lake Bosten is the largest inland freshwater lake of China and plays a key role in the local arid-area ecosystem.The amount and quality of the water Lake Bosten are vital to the people in the oasis based socio-economic system the lake supportted.However,the environmental problems of Lake Bosten emerged are getting worse day by day resulted from the large variation of water level and worse and worse water quality,which were focused by the government and scholars.This study focuses on the dynamics of water-salinity of Lake Bosten in the past 60 years(1951-2011) and their response to climate change,attempted to predict water level and water quality change trend.The results showed that water level of Lake Bosten in 1951-2011 had a significant increasing trend.Step change points in water level were identified in Lake Bosten,which occurred in the years around 1974 and 1994 dividing the long-term water level series into a stable period(1951-1974),a decreasing period(1975-1994) and an increasing period(1995-2011).Water salinity of Lake Bosten also presented three change stages.And the water level and water salinity showed a significant negative correlation,but the water quality change lagged one year compared with the water level.The temperature in Lake Bosten basin had a significant increasing trend,and its step change point occurred in the year around 1993,which was consistent with the run-off in Kaidu River.The correlation between the temperature and water level,water quality in the Lake Bosten is extremely significant.The temperature regulated the water quality and water level of Lake Bosten through changing the lake inflow and evaporation.The water level will have a decreasing trend and water quality will be worse and worse if the temperature maintain continued rising in the future.Therefore,in order to ensure the sustainable development and utilization of the water resources of Lake Bosten,and inhibit the deterioration of water quality,it should be concentrated the diversion time of Lake Bosten from May to September,and strictly controlled the industrial and agricultural water consumption,reduced the emissions of industrial,agricultural and domestic pollution,decreased the amount of surrounding groundwater development.