Interannual variation in riparian vegetation cover and its relationship with river flow under a high level of human intervention: an example from the Yongding River Basin.

Environmental Monitoring and Assessment
Liangsuo RenAizhong Ding

Abstract

Riparian vegetation cover is significantly affected by a river's hydrological conditions. Especially in arid and semiarid areas, low flow will degrade riparian vegetation, and recent, intensive human activities in the Yongding River Basin have caused a sharp decrease in river flow. We analyzed interannual change in riparian vegetation, river flow effects, and land use on vegetation coverage using the 40 years (1977-2016) of remote sensing images and river flow, combined with 38 years (1980-2018) of land use data. The normalized difference vegetation index (NDVI) was used to determine vegetation cover in five different categories: extremely low, low, medium, high, and extremely high based on the pixel dichotomy model. The weighted average was calculated to obtain vegetation cover trends. We show that riparian vegetation cover from four rivers increased. Compared with 1977, in 2016, combined high and extremely high vegetation covers at the Dongyang, Yang, Sanggan, and Yongding Rivers increased by 20.3%, 26.7%, 50.0%, and 39.2%, respectively. High (R =  -0.976, P < 0.01) and extremely high (R =  -0.762, P < 0.05) vegetation covers are negatively correlated with flow in the Yongding River. The high vegetation cover of the Sanggan R...Continue Reading

References

Apr 19, 2011·The Science of the Total Environment·Xuelei WangC M Mannaerts
Feb 14, 2017·Journal of Environmental Management·Patricia María Rodríguez-GonzálezRicardo Díaz-Delgado
Oct 18, 2018·PloS One·Lizhuang LiangShukui Niu
May 1, 2020·Journal of Environmental Management·Leo HuylenbroeckAdrien Michez
Oct 2, 2020·Journal of Advances in Modeling Earth Systems·M LatellaC Camporeale

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