Is There Any Correlation Between Landscape Characteristics and Total Nitrogen in Wetlands Receiving Agricultural Drainages?

• Published in: Chinese geographical science Vol. 29; no. 4; pp. 712 - 724
• Main Authors: Yu, Han, Wang, Xiaodong, Chu, Lijuan, Wang, Guodong, Sun, Guangzhi, Sun, Mingyang, Wang, Jingyu, Jiang, Ming
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.08.2019; Springer Nature B.V; College of Agriculture, Jilin Agricultural University, Changchun130118, China; College of Art and Design, Jilin Jianzhu University, Changchun130118,China%Jilin Academy of Agriculture Sciences, Changchun130033,China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun130102, China%College of Urban and Environmental Sciences, Changchun Normal University, Changchun130032, China%Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun130102, China%School of Engineering,Edith Cowan University, Joondalup6027,Australia%Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun130102, China
• Subjects: Correlation analysis; Earth and Environmental Science; Geography; Landscape; Nitrogen; Sampling; Water bodies; Water purification; Water treatment; Wetland agriculture; Wetlands; Naoli River wetlands; agricultural drainages; total nitrogen removal; step-by-step elimination analysis; spatial pattern
• ISSN: 1002-0063; 1993-064X
• DOI: 10.1007/s11769-019-1037-8

In the case of increasing fragmentation of wetlands, the study of the relationship between wetland landscape characteristics and total nitrogen (TN) in water is of great significance to reveal the mechanism of wetland water purification. Taking the Naoli River (NR) wetlands in Northeast China as the research object, 10 uniformly distributed sampling sites in the study area were sampled in August 2015 to test the TN concentration and interpret the images of NR wetlands in the same period. Taking the sampling site as the control point, the whole wetlands were divided into 10 regions, and the landscape index of each region was extracted. In order to reveal whether the landscape characteristics are related to the TN concentration in the wetlands water body, the landscape index and the TN concentration in the control point water body were analyzed by correlation analysis, step-by-step elimination analysis and path analysis to reveal whether the landscape characteristics are related to the TN concentration under wetlands receiving agricultural drainages. The results showed that the correlation coefficients between four area indexes or eight shape indexes and TN concentration did not reach a significant correlation level ( P > 0.05), indicating that TN removal was not only determined by a single landscape index. The path coefficient of edge density (ED) index is −0.41, indicating that wetland patch connectivity is the primary factor of TN removal, and there is no relationship between the larger patch area and the higher TN removal. The removal of TN in wetlands is restricted by the synergistic effect of landscape area and shape characteristics.