文献类型： 外文期刊

第一作者： Yu Han

作者： Yu Han;Yu Han;Wang Guodong;Sun Mingyang;Jiang Ming;Wang Xiaodong;Chu Lijuan;Sun Guangzhi;Sun Mingyang;Wang Jingyu

作者机构：

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

期刊名称：CHINESE GEOGRAPHICAL SCIENCE （ 影响因子：2.892； 五年影响因子：2.721 ）

ISSN： 1002-0063

年卷期： 2019 年 29 卷 4 期

页码：

收录情况： SCI

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.

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