The Zhalong wetland,a Ramsar listed wetland in China,which is located in the lower reaches of theWuyu’er River,perennially takes in lots of nutrient input of N and P from around the catchment.Nutrient substanceswere ...The Zhalong wetland,a Ramsar listed wetland in China,which is located in the lower reaches of theWuyu’er River,perennially takes in lots of nutrient input of N and P from around the catchment.Nutrient substanceswere especially accumulated in the shallowlakes owning to the low-lying topography.The Xianhe Lake,where is loca-ted in buffer zone of the Zhalong wetland reserve,was chosen as our target area.The spatial variation of nutrient sub-stances in the shallow lakes was discussed and its influence factors were pointed out.The results showed that nitrogenand phosphorus in the wetland water existed mainly in the form of organic ones.The concentration of total nitrogen(TN)ranged from 0.65 mg/L to 10.64 mg/L and total phosphorus(TP) ranged from 0.013 mg/L to 0.052 mg/L.Ratio ofN/P was between 25.6 and 206.5.The water quality of the Xianhe Lake has been contaminated and is in heavy eutroph-ication.Total P has been acting as the major limiting factor.The distribution pattern of nitrogen and phosphorus in wet-land water showed characteristics of internal release except for the stream mouth area.There,the vertical distributions ofnitrogen and phosphorus nutrients were from both exterior source and internal release,and was mainly influenced by ex-terior source during flood period.Strong hydrodynamic disturb contributed to nitrogen and phosphorus nutrients suspen-ding and releasing in the sediments.The nutrients distribution in the water varied independent on regional changes ofdifferent frequency of hydrodynamic disturb.Mineralization and denitrification might be promoted in high frequency hy-drodynamic disturb area.In growing period,the absorption ofPhragmitesto nutrients was an important mechanism of nu-trients descending and spatial variation in the shallow lake.展开更多
基金President Scholarship of Chinese Academy of Sciences
文摘The Zhalong wetland,a Ramsar listed wetland in China,which is located in the lower reaches of theWuyu’er River,perennially takes in lots of nutrient input of N and P from around the catchment.Nutrient substanceswere especially accumulated in the shallowlakes owning to the low-lying topography.The Xianhe Lake,where is loca-ted in buffer zone of the Zhalong wetland reserve,was chosen as our target area.The spatial variation of nutrient sub-stances in the shallow lakes was discussed and its influence factors were pointed out.The results showed that nitrogenand phosphorus in the wetland water existed mainly in the form of organic ones.The concentration of total nitrogen(TN)ranged from 0.65 mg/L to 10.64 mg/L and total phosphorus(TP) ranged from 0.013 mg/L to 0.052 mg/L.Ratio ofN/P was between 25.6 and 206.5.The water quality of the Xianhe Lake has been contaminated and is in heavy eutroph-ication.Total P has been acting as the major limiting factor.The distribution pattern of nitrogen and phosphorus in wet-land water showed characteristics of internal release except for the stream mouth area.There,the vertical distributions ofnitrogen and phosphorus nutrients were from both exterior source and internal release,and was mainly influenced by ex-terior source during flood period.Strong hydrodynamic disturb contributed to nitrogen and phosphorus nutrients suspen-ding and releasing in the sediments.The nutrients distribution in the water varied independent on regional changes ofdifferent frequency of hydrodynamic disturb.Mineralization and denitrification might be promoted in high frequency hy-drodynamic disturb area.In growing period,the absorption ofPhragmitesto nutrients was an important mechanism of nu-trients descending and spatial variation in the shallow lake.
