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Human activities are increasingly recognized as having a critical influence on hydrological processes under the warming of the climate, particularly for dam-regulated rivers. To ensure the sustainable management of water resources, it is important to evaluate how dam construction may affect surface runoff. In this study, using Mann–Kendall tests, the double mass curve method, and the Budyko-based elasticity method, the effects of climate change and human activities on annual and seasonal runoff were quantified for the Yellow River basin from 1961–2018; additionally, effects on runoff were assessed after the construction of the Xiaolangdi Dam (XLD, started operation in 2001) on the Yellow River. Both annual and seasonal runoff decreased over time (p < 0.01), due to the combined effects of climate change and human activities. Abrupt changes in annual, flood season, and non-flood season runoff occurred in 1986, 1989, and 1986, respectively. However, no abrupt changes were seen after the construction of the XLD. Human activities accounted for much of the reduction in runoff, approximately 75–72% annually, 81–86% for the flood season, and 86–90% for the non-flood season. Climate change approximately accounted for the remainder: 18–25% (annually), 14–19% (flood season), and 10–14% (non-flood season). The XLD construction mitigated runoff increases induced by heightened precipitation and reduced potential evapotranspiration during the post-dam period; the XLD accounted for approximately 52% of the runoff reduction both annually and in the non-flood season, and accounted for approximately −32% of the runoff increase in the flood season. In conclusion, this study provides a basic understanding of how dam construction contributes to runoff changes in the context of climate change; this information will be beneficial for the sustainable management of water resources in regulated rivers.
Qinghe Zhao; Shengyan Ding; Xiaoyu Ji; Zhendong Hong; Mengwen Lu; Peng Wang. Relative Contribution of the Xiaolangdi Dam to Runoff Changes in the Lower Yellow River. Land 2021, 10, 521 .
AMA StyleQinghe Zhao, Shengyan Ding, Xiaoyu Ji, Zhendong Hong, Mengwen Lu, Peng Wang. Relative Contribution of the Xiaolangdi Dam to Runoff Changes in the Lower Yellow River. Land. 2021; 10 (5):521.
Chicago/Turabian StyleQinghe Zhao; Shengyan Ding; Xiaoyu Ji; Zhendong Hong; Mengwen Lu; Peng Wang. 2021. "Relative Contribution of the Xiaolangdi Dam to Runoff Changes in the Lower Yellow River." Land 10, no. 5: 521.
Determining the relationship between plant functional traits and the environment are key for the protection and sustainable utilization of riparian wetlands. In the middle and lower reaches of the Yellow River, riparian wetlands are divided into seasonal floodplain wetlands (natural) and pond-like wetlands or paddy fields (artificial). Here, species composition differences were catalogued based on plant functional traits including origin, life history, and wetland affinity in natural and artificial wetlands. Wetland physicochemical characteristics and regional socio-economic parameters collected as indicators of environmental variables were used to analyze the plant functional trait-environment relationship. The results reveal that plant functional traits in the seasonal floodplain wetland are impacted by physicochemical characteristics of habitat. The abundance of annual plants tends to decrease with concentration of heavy metals, while species diversity is mainly determined by soil physical and chemical properties, especially soil pH and temperature. Specifically, wetland-obligate species (not in water) are more resistant to heavy metal content in water than species with other types of wetland affinity. Life history strategies of species in artificial sites tend to be significantly associated with animal husbandry and artificial populations, while the wetland affinity of species is mainly determined by regional agriculture, especially the installation of agricultural covered areas. Furthermore, water quality and nutrients in suspended sediments from the Yellow River affected species diversity and life history strategies by affecting water and soil conditions of surrounding wetlands, especially conductivity and phosphorus levels.
Zhendong Hong; Shengyan Ding; Qinghe Zhao; Pengwei Qiu; Jinlong Chang; Li Peng; Shuoqian Wang; Yongyi Hong; Gang-Jun Liu. Plant trait-environment trends and their conservation implications for riparian wetlands in the Yellow River. Science of The Total Environment 2020, 767, 144867 .
AMA StyleZhendong Hong, Shengyan Ding, Qinghe Zhao, Pengwei Qiu, Jinlong Chang, Li Peng, Shuoqian Wang, Yongyi Hong, Gang-Jun Liu. Plant trait-environment trends and their conservation implications for riparian wetlands in the Yellow River. Science of The Total Environment. 2020; 767 ():144867.
Chicago/Turabian StyleZhendong Hong; Shengyan Ding; Qinghe Zhao; Pengwei Qiu; Jinlong Chang; Li Peng; Shuoqian Wang; Yongyi Hong; Gang-Jun Liu. 2020. "Plant trait-environment trends and their conservation implications for riparian wetlands in the Yellow River." Science of The Total Environment 767, no. : 144867.