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Assessing riparian zone changes under the influence of stress factors in higher-order streams and tributaries: Implications for the management of massive dams and reservoirs
Arif, Muhammad1,3; Jie, Zheng1; Wokadala, Charles1; Songlin, Zhang2; Zhongxun, Yuan1; Zhangting, Chen1; Zhi, Dong1; Xinrui, He1; Changxiao, Li1
2021-07-01
摘要Riparian ecosystem services along higher-order streams and connected tributaries may change over time as disturbances continuously increase, resulting in diverse deterioration of buffer zones. How habitat, plant cover, regeneration, erosion, and exotic parameters (riparian health conditions) change within huge dams and reservoirs worldwide is an unanswered question. We used multivariate statistical techniques to assess changes in riparian health parameters affected by disturbances identified in 304 transects within the Three Gorges Dam Reservoir, China, and associated tributaries. Kruskal & ndash;Wallis tests (p < 0.01) revealed high diversity in habitat, plant cover, regeneration, erosion, and overall stream condition. There was also notable variance relating to exotic and pressure parameters. The critical variables of riparian health indicators and stress factors identified by principal component analysis explained 58.40% and 74.6% (in the main waterway) and 53.23% and 71.0% (in the tributaries) of the total variance. Among riparian health indicators, one habitat parameter (riparian vegetation width) in the main waterway and one regeneration parameter (tree size classes) in tributaries contributed greatly, along with other specified parameters. Furthermore, stress factors such as farming systems, land-use types, and pollutant activity variables had the highest impact on these water bodies. In comparison, counting stress factors alone showed more deterioration in the main waterway with a range of (r = & minus;0.527 & ndash; 0.493), as determined using Pearson correlation (p < 0.05). Furthermore, after indexing, the parameters exhibited weaker coefficient values in tributaries, where exotic correlated negatively with other indexed values. These findings are relevant for managers of massive dam and reservoir ecosystems seeking to mitigate environmental and socioeconomic losses.& nbsp; (c) 2021 Elsevier B.V. All rights reserved.
关键词Rapid appraisal Pressure indicators Riparian health condition Main river Tributary Three Gorges Dam Reservoir
DOI10.1016/j.scitotenv.2021.146011
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
卷号776页码:15
通讯作者Changxiao, Li(lichangx@swu.edu.cn)
收录类别SCI
WOS记录号WOS:000647609000005
语种英语