scholarly journals Research on runoff variation trend and hydrological situation variation in Wujiang River Basin

2021 ◽  
Vol 826 (1) ◽  
pp. 012004
Author(s):  
Guo Wei ◽  
Shao Jun ◽  
Ou Yangshuo ◽  
Yao Liqiang ◽  
Wu Guangdong ◽  
...  
Keyword(s):  
River Basin ◽  
Variation Trend ◽  
Runoff Variation ◽  
Wujiang River

scholarly journals Analysis of Runoff Variation Characteristics and Influencing Factors in the Wujiang River Basin in the Past 30 Years

2021 ◽  
Vol 19 (1) ◽  
pp. 372
Author(s):  
Wenxian Guo ◽  
Jianwen Hu ◽  
Hongxiang Wang
Keyword(s):  
River Basin ◽  
Kendall Test ◽  
Annual Runoff ◽  
Underlying Surface ◽  
Vegetation Coverage ◽  
Factors Affecting ◽  
Runoff Variation ◽  
Wujiang River ◽  
Variation Characteristics ◽  
Moderate Change

Changes in climate and the underlying surface are the main factors affecting runoff. Quantitative assessment of runoff characteristics, and determination of the climate and underlying surface contribution to changes in runoff are critical to water resources management and protection. Based on the runoff data from the Wulong Hydrological Station, combined with the Mann-Kendall test, Indicators of Hydrologic Alteration (IHA), Budyko hypothesis, and changes in climate and the underlying surface, this study comprehensively analyzed the runoff in the Wujiang River Basin (WRB). The results showed that: (1) The annual runoff of Wujiang River showed a downward trend, and an abrupt change occurred in 2005. (2) The overall hydrological change in WRB is 46%, reaching a moderate change. (3) The contribution rates of precipitation (P), potential evaporation (ET0), and underlying surface to runoff changes are 61.5%, 11.4%, and 26.9%, respectively. (4) After 2005, the WRB has become more arid, human activities have become more active, vegetation coverage has increased, and the built-up land has increased significantly.

Runoff variation law and its response to climate change in the headstream area of the Keriya River basin, Xinjiang

2011 ◽  
Vol 22 (6) ◽  
pp. 780-791 ◽  
Author(s):  
Hongbo Ling ◽  
Qingqing Zhang ◽  
Wei Shi ◽  
Hailiang Xu
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Runoff Variation

The Effect of Cultivation on the Greenhouse Gases Emissions in wujiang river Basin, Yangtze River, China

2020 ◽  
Author(s):  
xiaoling wu
Keyword(s):  
Carbon Source ◽  
Greenhouse Gases ◽  
River Basin ◽  
Carbon Sink ◽  
Paddy Soils ◽  
Dry Land ◽  
Global Mean Temperature ◽  
Wujiang River ◽  
Paddy Crop ◽  
Global Mean

<p>Climate change has gained extensive international attention due to the impacts on the regional agriculture and water supply. According to IPCC, the global mean temperature will increase by 0.3-0.8 centigrade. Greenhouse gases such as CO<sub>2</sub>, CH<sub>4</sub>, and N<sub>2</sub>O will concentrate and global mean temperature are projected to be increasing. This study separately examines the Greenhouse gases effect arise from different tillage type (dry land and paddy crop) in Wujiang river basin using DeNitrification - DeComposition (DNDC) model. The simulations indicate that, the atmospheric CO<sub>2</sub> and CH<sub>4</sub><sub> </sub>concentration increases with the paddy crop plants. Although between two irrigation periods, the field drying event can decrease the CH<sub>4</sub> production effectively. In addition, the paddy soils in this region tend to increase the effect of carbon source resulted from the flooding irrigation. Especially in the first flood irrigation period, the N<sub>2</sub>O increases to the maximum value. By contrast, in crop land under rotation of rape and Maize, the effect of carbon sink induced from CO<sub>2</sub> fertilization could generally offset the effect of carbon source. Meanwhile, the effect of carbon sink increased resulted by the plant grows. Thus, the production of CO<sub>2</sub> is always negative. There is no CH<sub>4</sub> production in crop land under rotation of rape and Maize. By contrast, with fertilization input, the N<sub>2</sub>O production increases from 0.05 kg C/kg to 0.5kg N/ha/day. The SOC from the top soils (0-10 cm) to bottom (40-50 cm) decreases from 0.021 kg C/kg to 0.014 kg C/kg in either dry land and paddy soils of the Wujiang River region from 1991 to 1994, respectively. These results suggest that SOC storage in paddy and dry land of this region is steady. For the dry land crop (rotation of rape and Maize), the N<sub>2</sub>O increased with the fertilization. But for the paddy soils, the irrigation time is the key point period for greenhouse gases production and the variation of carbon and nitrogen in soil. As a representative of paddy crop and dry land crop (rotation of rape and Maize) in western China, the insights gained from the Wujiang River basin may be potentially transferable to other similar agricultural practices in other part of China.</p>

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