According to 12 kinds of water quality elements(salt,COD,DO,PO_(4)^(3)--P,inorganic nitrogen,Oil,Cu,Pb,Zn,Cd,Hg,As)in 20 sampling stations in Dafeng sea area.The single factor index method was used to evaluate the wat...According to 12 kinds of water quality elements(salt,COD,DO,PO_(4)^(3)--P,inorganic nitrogen,Oil,Cu,Pb,Zn,Cd,Hg,As)in 20 sampling stations in Dafeng sea area.The single factor index method was used to evaluate the water pollution level,the clustering method was used to identify the pollution area,and the source of pollution was analyzed by principal component analysis.The results show:the water quality environment in Dafeng Sea is generally good,and inorganic nitrogen and phosphate are the main over-standard factors.;The spatial cluster analysis shows that the distribution of water quality pollution in Dafeng sea area is low in the south and high in the north,and a gradual increase from the shore to the sea;Principal component analysis results display,sources of pollution include the input of terrestrial pollution(nutrient salts,Cd,As),the marine aquaculture pollution(nutrient salts,Cu),port pollution(Oil,Zn,Pb,Hg).展开更多
A milu deer crosses a river in Dafeng,Jiangsu Province,on 2 July.The city is home to the world’s largest milu deer nature reserve,covering 78,000 hectares and hosting the largest wild population of the species globally.
文摘According to 12 kinds of water quality elements(salt,COD,DO,PO_(4)^(3)--P,inorganic nitrogen,Oil,Cu,Pb,Zn,Cd,Hg,As)in 20 sampling stations in Dafeng sea area.The single factor index method was used to evaluate the water pollution level,the clustering method was used to identify the pollution area,and the source of pollution was analyzed by principal component analysis.The results show:the water quality environment in Dafeng Sea is generally good,and inorganic nitrogen and phosphate are the main over-standard factors.;The spatial cluster analysis shows that the distribution of water quality pollution in Dafeng sea area is low in the south and high in the north,and a gradual increase from the shore to the sea;Principal component analysis results display,sources of pollution include the input of terrestrial pollution(nutrient salts,Cd,As),the marine aquaculture pollution(nutrient salts,Cu),port pollution(Oil,Zn,Pb,Hg).
文摘A milu deer crosses a river in Dafeng,Jiangsu Province,on 2 July.The city is home to the world’s largest milu deer nature reserve,covering 78,000 hectares and hosting the largest wild population of the species globally.
