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

论文摘要

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.

论文目录

• 1 Introduction
• 2 Materials and Methods
•   2.1 Study area
•   2.2 Water sampling and determination
•   2.3 Remote sensing interpretation and landscape index extraction
•   2.4 Data analysis
• 3 Results
•   3.1 Influence of landscape area on TN removal
•     3.1.1 Correlation between areal indices and TN con-centration
•     3.1.2 Relationship between areal indices and TN re-moval
•   3.2 Influence of landscape shape on TN removal
•     3.2.1 Correlation between shape indices and TN concentration
•     3.2.2 Relationship between shape indices and TN removal
•   3.3 Comprehensive effects of landscape area and shape on TN removal
• 4 Discussion
•   4.1 Effect of wetland area on TN removal
•   4.2 Effect of wetland patch core area on TN re-moval
•   4.3 Effect of wetland connectivity on TN removal
• 5 Conclusions

文章来源

类型: 期刊论文

作者: YU Han,WANG Xiaodong,CHU Lijuan,WANG Guodong,SUN Guangzhi,SUN Mingyang,WANG Jin-gyu,JIANG Ming

来源: Chinese Geographical Science 2019年04期

年度: 2019

分类: 基础科学,工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 环境科学与资源利用,建筑科学与工程

单位: College of Agriculture, Jilin Agricultural University,Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science,College of Urban and Environmental Sciences, Changchun Normal University,School of Engineering, Edith Cowan University,College of Art and Design, Jilin Jianzhu University,Jilin Academy of Agriculture Sciences

基金: 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),Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences(No.IGA-135-05)

分类号: TU984.18;X52

页码: 712-724

总页数: 13

文件大小: 567K

下载量: 9