Impacts of climate change and human activities on the aboveground production in alpine grasslands: a case study of the source region of the Yellow River, China

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Hao-jie Xu ◽  
Xin-ping Wang ◽  
Xiao-xiao Zhang
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Yellow River ◽  
Source Region ◽  
The Yellow River ◽  
Alpine Grasslands ◽  
Aboveground Production ◽  
Impacts Of Climate Change

Impacts of climate change on flow regime and sequential threats to riverine ecosystem in the source region of the Yellow River

2018 ◽  
Vol 77 (12) ◽  
Author(s):  
Xiaoyan Wang ◽  
Tao Yang ◽  
Bin Yong ◽  
Valentina Krysanova ◽  
Pengfei Shi ◽  
...  
Keyword(s):  
Climate Change ◽  
Flow Regime ◽  
Yellow River ◽  
Source Region ◽  
The Yellow River ◽  
Riverine Ecosystem ◽  
Impacts Of Climate Change

scholarly journals Climate-induced hydrologic change in the source region of the Yellow River: a new assessment including varying permafrost

2018 ◽  
Author(s):  
Pan Wu ◽  
Sihai Liang ◽  
Xu-Sheng Wang ◽  
Yuqing Feng ◽  
Jeffrey M. McKenzie
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Yellow River ◽  
Source Region ◽  
The Yellow River ◽  
Observation Data ◽  
Total Change ◽  
Hydrologic Change ◽  
Long Term Observation ◽  
The Impact

Abstract. The source region of the Yellow River (SRYR) provides 35 % of the rivers annual discharge but is very sensitive to the climate change. The change in discharge from the SRYR has been attributed to both climatic and anthropogenic forces, and previous estimates of the impact of human activities on the change in discharge have been higher than 50 % of the total change. Considering the very low population density and limited land use change, this result is potentially inconsistent. Our study modifies the traditional Budyko separating approach to identify and quantify the climatic causes in discharge changes. Application of this new approach to the SRYR now highlights the role of the degrading permafrost, based on long-term observation data of the maximum frozen depth (MFD). Our results show that over the past half-century, the change in discharge in the SRYR was primarily controlled by climate change rather than local human activities. Increasing air temperature is generally a negative force on discharge whereas it also causes permafrost to degrade – a positive factor on discharge generation. Such conflicting effects enhance the uncertainty in assessments of the hydrological response to climate change in the SRYR.

scholarly journals Impact of Land Cover Types on Riverine CO2 Outgassing in the Yellow River Source Region

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2243
Author(s):  
Mingyang Tian ◽  
Xiankun Yang ◽  
Lishan Ran ◽  
Yuanrong Su ◽  
Lingyu Li ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Cover ◽  
Yellow River ◽  
Stream Water ◽  
Source Region ◽  
The Yellow River ◽  
Co2 Efflux ◽  
Land Cover Types ◽  
Yellow River Source ◽  
Alpine Rivers

Under the context of climate change, studying CO2 emissions in alpine rivers is important because of the large carbon storage in these terrestrial ecosystems. In this study, riverine partial pressure of CO2 (pCO2) and CO2 emission flux (FCO2) in the Yellow River source region (YRSR) under different landcover types, including glaciers, permafrost, peatlands, and grasslands, were systematically investigated in April, June, August, and October 2016. Relevant chemical and environmental parameters were analyzed to explore the primary controlling factors. The results showed that most of the rivers in the YRSR were net CO2 source, with the pCO2 ranging from 181 to 2441 μatm and the FCO2 ranging from −50 to 1574 mmol m−2 d−1. Both pCO2 and FCO2 showed strong spatial and temporal variations. The highest average FCO2 was observed in August, while the lowest average was observed in June. Spatially, the lowest FCO2 were observed in the permafrost regions while the highest FCO2 were observed in peatland. By integrating seasonal changes of the water surface area, total CO2 efflux was estimated to be 0.30 Tg C year−1. This indicates that the YRSR was a net carbon source for the atmosphere, which contradicts previous studies that conclude the YRSR as a carbon sink. More frequent measurements of CO2 fluxes, particularly through several diel cycles, are necessary to confirm this conclusion. Furthermore, our study suggested that the riverine dissolved organic carbon (DOC) in permafrost (5.0 ± 2.4 mg L−1) is possibly derived from old carbon released from permafrost melting, which is equivalent to that in peatland regions (5.1 ± 3.7 mg L−1). The degradation of DOC may have played an important role in supporting riverine CO2, especially in permafrost and glacier-covered regions. The percent coverage of corresponding land cover types is a good indicator for estimating riverine pCO2 in the YRSR. In view of the extensive distribution of alpine rivers in the world and their sensitivity to climate change, future studies on dynamics of stream water pCO2 and CO2 outgassing are strongly needed to better understand the global carbon cycle.

Water scarcity in the Yellow River Basin under future climate change and human activities

2020 ◽  
Vol 749 ◽  
pp. 141446 ◽  
Author(s):  
Abubaker Omer ◽  
Nadir Ahmed Elagib ◽  
Ma Zhuguo ◽  
Farhan Saleem ◽  
Alnail Mohammed
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Water Scarcity ◽  
Human Activities ◽  
Yellow River ◽  
Yellow River Basin ◽  
Future Climate ◽  
Future Climate Change ◽  
The Yellow River ◽  
The Yellow River Basin

Hydrological Cycles Change in the Yellow River Basin during the Last Half of the Twentieth Century

2008 ◽  
Vol 21 (8) ◽  
pp. 1790-1806 ◽  
Author(s):  
Qiuhong Tang ◽  
Taikan Oki ◽  
Shinjiro Kanae ◽  
Heping Hu
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Human Activities ◽  
River Discharge ◽  
Yellow River ◽  
Yellow River Basin ◽  
The Yellow River ◽  
Linear Component ◽  
Annual Streamflow ◽  
The Yellow River Basin

Abstract A distributed biosphere hydrological (DBH) model system was used to explore the internal relations among the climate system, human society, and the hydrological system in the Yellow River basin, and to interpret possible mechanisms for observed changes in Yellow River streamflow from 1960 to 2000. Several scenarios were evaluated to elucidate the hydrological response to climate system, land cover, and irrigation. The results show that climate change is the dominant cause of annual streamflow changes in the upper and middle reaches, but human activities dominate annual streamflow changes in the lower reaches of the Yellow River basin. The annual river discharge at the mouth is affected by climate change and by human activities in nearly equal proportion. The linear component of climate change contributes to the observed annual streamflow decrease, but changes in the climate temporal pattern have a larger impact on annual river discharge than does the linear component of climate change. Low flow is more significantly affected by irrigation withdrawals than by climate change. Reservoirs induce more diversions for irrigation, while at the same time the results demonstrate that the reservoirs may help to maintain environmental flows and counter what otherwise would be more serious reductions in low flows.

Stepwise decreases of the Huanghe (Yellow River) sediment load (1950–2005): Impacts of climate change and human activities

2007 ◽  
Vol 57 (3-4) ◽  
pp. 331-354 ◽  
Author(s):  
Houjie Wang ◽  
Zuosheng Yang ◽  
Yoshiki Saito ◽  
J. Paul Liu ◽  
Xiaoxia Sun ◽  
...  
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
River Sediment ◽  
Sediment Load ◽  
Yellow River ◽  
Yellow River Sediment ◽  
Impacts Of Climate Change
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