数字农科院2.0

The role of biological factors in nitrogen attenuation in ditch: An innovative approach through quantification of biological factors

文献类型： 外文期刊

作者： Zhang, Xulin;Yin, Gaofei;Zhang, Zihan;Lou, Yang;Feng, Peipei;Hua, Lingling;Liu, Hongbin;Li, Wenchao

作者机构：

关键词： Ditch;Biological factors;Nitrogen;Attenuation process

期刊名称： JOURNAL OF HYDROLOGY

ISSN： 0022-1694

年卷期： 2025 年 666 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Agricultural non-point source pollution has been a major cause for surface water degradation. The transport and transformation of nitrogen within ditches are found to be critical processes in determining agricultural non-point source pollution. Currently, research on the quantification of nitrogen attenuation in ditches primarily focuses on hydrological factors. Although the role of biological factors is increasingly recognized, effective methods to quantify these impacts remain lacking. Additionally, the understanding of biological effects at larger scales, such as the watershed scale, is also limited. In this study, a biodiversity index was calculated to quantitatively assess the biological status in ditches. Furthermore, a case study with a 15N isotope tracing experiment was performed to investigate nitrogen attenuation among different ditches. Our results provide new insights into the role of biological factors in nitrogen attenuation progress. We observed the biodiversity index in unhardened ditches (1.10) was higher than in vegetated hardened ditches (0.67) and minimally vegetated hardened ditches (0.05). This indicated that the biological status in unhardened ditches is significantly healthier. Moreover, our findings revealed that nitrogen attenuation of vegetated ditches is higher than in non-vegetated ditches. Specifically, the NO3- cumulative attenuation coefficient in the unhardened ditch and the vegetated hardened ditch was 0.55-fold and 1.78-fold higher, respectively, than that in the minimally vegetated hardened ditch. Both hydrological and biological factors influenced the nitrogen attenuation coefficient. By examining the relationship between the nitrogen attenuation coefficient and these influencing factors, we found that 94 % of the variation in nitrogen attenuation was explained by three major factors, including distance, biodiversity index, and discharge. Overall, the biological factors assessment framework we constructed offers a novel approach to quantifying the role of biological factors in the nitrogen attenuation process in ditches.

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