中国地理科学 ›› 2019, Vol. 20 ›› Issue (4): 712-724.doi: 10.1007/s11769-019-1037-8

• 论文 • 上一篇    

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

YU Han1,2, WANG Xiaodong3, CHU Lijuan3, WANG Guodong2, SUN Guangzhi4, SUN Mingyang2,5, WANG Jingyu6, JIANG Ming2   

  1. 1. College of Agriculture, Jilin Agricultural University, Changchun 130118, China;
    2. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102, China;
    3. College of Urban and Environmental Sciences, Changchun Normal University, Changchun 130032, China;
    4. School of Engineering, Edith Cowan University, Joondalup 6027, Australia;
    5. College of Art and Design, Jilin Jianzhu University, Changchun 130118, China;
    6. Jilin Academy of Agriculture Sciences, Changchun 130033, China
  • 收稿日期:2018-09-29 修回日期:2018-05-26 出版日期:2019-08-27 发布日期:2019-06-28
  • 通讯作者: WANG Xiaodong.E-mail:wangxd219@nenu.edu.cn E-mail:wangxd219@nenu.edu.cn
  • 基金资助:

    Under the auspices of National Natural Science Foundations of China (No. 41620104005, 31500307, 41601263, 41771120), Technology Development Program of Jilin Province (No. 20180101082JC, 20180520085JC, 20190201256JC, 20190201018JC), Natural Science Foundation of Changchun Normal University (No. 2016-009) and Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences (No. IGA-135-05)

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

YU Han1,2, WANG Xiaodong3, CHU Lijuan3, WANG Guodong2, SUN Guangzhi4, SUN Mingyang2,5, WANG Jingyu6, JIANG Ming2   

  1. 1. College of Agriculture, Jilin Agricultural University, Changchun 130118, China;
    2. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102, China;
    3. College of Urban and Environmental Sciences, Changchun Normal University, Changchun 130032, China;
    4. School of Engineering, Edith Cowan University, Joondalup 6027, Australia;
    5. College of Art and Design, Jilin Jianzhu University, Changchun 130118, China;
    6. Jilin Academy of Agriculture Sciences, Changchun 130033, China
  • Received:2018-09-29 Revised:2018-05-26 Online:2019-08-27 Published:2019-06-28
  • Contact: WANG Xiaodong.E-mail:wangxd219@nenu.edu.cn E-mail:wangxd219@nenu.edu.cn
  • Supported by:

    Under the auspices of National Natural Science Foundations of China (No. 41620104005, 31500307, 41601263, 41771120), Technology Development Program of Jilin Province (No. 20180101082JC, 20180520085JC, 20190201256JC, 20190201018JC), Natural Science Foundation of Changchun Normal University (No. 2016-009) and Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences (No. IGA-135-05)

摘要:

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.

关键词: Naoli River wetlands, total nitrogen removal, spatial pattern, step-by-step elimination analysis, agricultural drainages

Abstract:

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.

Key words: Naoli River wetlands, total nitrogen removal, spatial pattern, step-by-step elimination analysis, agricultural drainages