scholarly journals Climate, CO2, and Anthropogenic Drivers of Accelerated Vegetation Greening in the Haihe River Basin

2022 ◽  
Vol 14 (2) ◽  
pp. 268
Author(s):  
Wenjing Yang ◽  
Yong Zhao ◽  
Qingming Wang ◽  
Buliao Guan
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Human Activities ◽  
Co2 Concentration ◽  
Haihe River Basin ◽  
Mountainous Areas ◽  
Haihe River ◽  
The Haihe River Basin ◽  
The Impact ◽  
Anthropogenic Drivers

Vegetation regulates the exchange of terrestrial carbon and water fluxes and connects the biosphere, hydrosphere, and atmosphere. Over the last four decades, vegetation greening has been observed worldwide using satellite technology. China has also experienced a notably widespread greening trend. However, the responsiveness of vegetation dynamics to elevated CO2 concentration, climate change, and human activities remains unclear. In this study, we attempted to explore the impact of natural (precipitation, air temperature), biogeochemical (CO2), and anthropogenic drivers (nighttime light, afforestation area) on changes in vegetation greenness in the Haihe River Basin (HRB) during 2002–2018 at the county-level. We further determined the major factors affecting the variation in satellite-derived normalized difference vegetation index (NDVI) from moderate resolution imaging spectroradiometer (MODIS) for each county. The results indicated that over 85% of the counties had a significantly increased NDVI trend, and the average linear trend of annual NDVI across the study region was 0.0037 per year. The largest contributor to the NDVI trend was CO2 (mean contribution 45%), followed by human activities (mean contribution of 27%). Additionally, afforestation was a pronounced driving force for NDVI changes in mountainous areas, resulting from ecosystem restoration efforts. Our findings emphasize the crucial role of CO2 fertilization in vegetation cover change, while considering CO2 concentration, climate change, and human activities, and shed light on the significant influences of afforestation programs on water resources, especially in mountainous areas.

Sensitivity of hydrological variables to climate change in the Haihe River basin, China

2011 ◽  
Vol 26 (15) ◽  
pp. 2294-2306 ◽  
Author(s):  
Zhenxin Bao ◽  
Jianyun Zhang ◽  
Jiufu Liu ◽  
Guoqing Wang ◽  
Xiaolin Yan ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Haihe River Basin ◽  
Haihe River ◽  
The Haihe River Basin ◽  
Hydrological Variables

Evaluation of changes in streamflow and the underlying causes: a perspective of an upstream catchment in Haihe River basin, China

2018 ◽  
Vol 11 (1) ◽  
pp. 241-257 ◽  
Author(s):  
Sicheng Wan ◽  
Jianyun Zhang ◽  
Guoqing Wang ◽  
Lu Zhang ◽  
Lei Cheng ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Human Activities ◽  
Hydrological Cycle ◽  
Kendall Test ◽  
Haihe River Basin ◽  
Changing Environment ◽  
Haihe River ◽  
Hydrological Simulation

Abstract Investigating long-term streamflow changes pattern and its response to climate and human factors is of crucial significance to understand the hydrological cycle under a changing environment. Caijiazhuang catchment located within Haihe River basin, north China was selected as the study area. To detect the trend and changes in streamflow, Mann–Kendall test was used. Elasticity and hydrological simulation methods were applied to assess the relative contribution of climate change and human activities on streamflow variability under three periods (baseline (1958–1977), impact I (1978–1997), and impact II (1998–2012)). The long-term hydro-climatic variables experienced substantial changes during the whole study period, and 1977 was the breaking year of streamflow change. Attribution analysis using the two methods showed consistent results: for impact I, climate change impacts explained 65% and 68% of streamflow reduction; however for impact II, it only represented 49% and 56% of streamflow reduction. This result indicated that human activities were intensifying over time. Various types of human activities presented significant effects on streamflow regimes including volumes and hydrographs. The findings of this paper could provide better insights of hydrological evolution and would thus assist water managers in sustainably managing and providing water use strategies under a changing environment.

Attribution for decreasing streamflow of the Haihe River basin, northern China: Climate variability or human activities?

2012 ◽  
Vol 460-461 ◽  
pp. 117-129 ◽  
Author(s):  
Zhenxin Bao ◽  
Jianyun Zhang ◽  
Guoqing Wang ◽  
Guobin Fu ◽  
Ruimin He ◽  
...  
Keyword(s):  
Climate Variability ◽  
River Basin ◽  
Human Activities ◽  
Northern China ◽  
Haihe River Basin ◽  
Haihe River ◽  
The Haihe River Basin

scholarly journals Future streamflow assessment in the Haihe River basin located in northern China using a regionalized variable infiltration capacity model based on 18 CMIP5 GCMs

2019 ◽  
Vol 11 (4) ◽  
pp. 1551-1569
Author(s):  
Zhenxin Bao ◽  
Jianyun Zhang ◽  
Xiaolin Yan ◽  
Guoqing Wang ◽  
Junliang Jin ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Future Climate ◽  
Future Climate Change ◽  
Haihe River Basin ◽  
Variable Infiltration Capacity ◽  
Infiltration Capacity ◽  
Haihe River ◽  
Increasing Trend ◽  
The Haihe River Basin

Abstract The impact of future climate change on streamflow is assessed in the Haihe River basin (HRB) by the Variable Infiltration Capacity (VIC) model, using the outputs from 18 general circulation models (GCMs) of the Coupled Model Inter-comparison Project Phase 5 (CMIP5). Three Representative Concentration Pathway (RCP) scenarios have been used, including RCP2.6, RCP4.5, and RCP8.5. Based on the model parameters calibration in six catchments in the HRB and parameter regionalization, the hydrological simulation for the whole HRB denotes good performance of the VIC model. Taking the period 1961–1990 as a baseline period, the outputs from the GCMs indicate that the HRB will become warmer and wetter in the 21st century (2010–2099). There might be an increasing trend for the streamflow in the HRB under future climate change scenarios. For example, in the 2050s (2040–2069), the streamflow may increase by 12%, 28%, and 24% under the RCP2.6, RCP4.5, and RCP8.5 scenarios, respectively. Monthly, the highest and lowest increase in streamflow is in dry and wet seasons, respectively. Spatially, the increasing trend for streamflow in the north HRB is higher than that in the south HRB. The uncertainty from the GCMs and climatic scenarios should be further focused.

Haihe River discharge to Bohai Bay, North China: trends, climate, and human activities

2016 ◽  
Vol 48 (4) ◽  
pp. 1058-1070 ◽  
Author(s):  
Qi Wei ◽  
Conghui Sun ◽  
Guanghong Wu ◽  
Ling Pan
Keyword(s):  
Human Activities ◽  
River Discharge ◽  
Kendall Test ◽  
Baseline Period ◽  
Annual Precipitation ◽  
Haihe River Basin ◽  
Bohai Bay ◽  
Haihe River ◽  
The Haihe River Basin ◽  
The Impact

Trends in annual precipitation and river discharge (1956–2012) were analyzed using the Mann–Kendall test and Sen's method to evaluate the impact of climate variation and human activities on the Haihe River discharge to Bohai Bay. Compared to observations before 1965, two obvious decreases in annual river discharge occurred after 1965 and after 1980. Considering 1956–1965 as the baseline period, it was established that the reduction in Haihe River discharge to the Bohai Sea was 52.9% and 81.9% during 1966–1980 and 1981–2012, respectively. Compared to the baseline period, the reductions in annual precipitation in 1966–1980 and 1981–2012 were 7.1% and 14.2%, respectively. Following the increase in population, industrial activity, and irrigated areas, water consumption has increased rapidly, from 51.9 mm in 1965 to 124.8 mm in 1980 and 126.4 mm in 2000. These results indicate that the reduction in discharge in the Haihe River basin during 1966–1980 and 1981–2000 could be attributed to climatic variations (33.2% and 41.4%, respectively) and human activities (66.8% and 58.6%, respectively). The results also indicate that salinity in Bohai Bay increased following the decrease in discharge from the Haihe River.

scholarly journals Temporal and Spatial Variation Characteristics of Precipitation in the Haihe River Basin under the Influence of Climate Change

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1664
Author(s):  
Yuhang Han ◽  
Bin Liu ◽  
Dan Xu ◽  
Chaoguo Yuan ◽  
Yanan Xu ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Haihe River Basin ◽  
Haihe River ◽  
Temperature And Precipitation ◽  
Increasing Trend ◽  
Temporal And Spatial ◽  
The Haihe River Basin ◽  
Precipitation Changes ◽  
Spearman’S Correlation

The impact of global climate change on the temporal and spatial variations of precipitation is significant. In this study, daily temperature and precipitation data from 258 meteorological stations in the Haihe River Basin, for the period 1960–2020, were used to determine the trend and significance of temperature and precipitation changes at interannual and interseasonal scales. The Mann–Kendall test and Spearman’s correlation analysis were employed, and significant change trends and correlations were determined. At more than 90% of the selected stations, the results showed a significant increase in temperature, at both interannual and interseasonal scales, and the increasing trend was more significant in spring than in other seasons. Precipitation predominantly showed a decreasing trend at an interannual scale; however, the change trend was not significant. In terms of the interseasonal scale, the precipitation changes in spring and autumn showed an overall increasing trend, those in summer showed a 1:1 distribution ratio of increasing and decreasing trends, and those in winter showed an overall decreasing trend. Furthermore, the Spearman’s correlation analysis showed a negative correlation between temperature and precipitation in the entire Haihe River Basin, at both interannual and interseasonal scales; however, most of the correlations were weak.

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