Assessing groundwater availability and the response of the groundwater system to intensive exploitation in the North China Plain by analysis of long-term isotopic tracer data

2018 ◽  
Vol 26 (5) ◽  
pp. 1401-1415 ◽  
Author(s):  
Chen Su ◽  
Zhongshuang Cheng ◽  
Wen Wei ◽  
Zongyu Chen
Keyword(s):  
North China Plain ◽  
North China ◽  
Groundwater System ◽  
Isotopic Tracer ◽  
Groundwater Availability ◽  
The North ◽  
The North China Plain ◽  
Intensive Exploitation

scholarly journals Contrasting Impacts of Long-Term Application of Biofertilizers and Organic Manure on Grain Yield of Winter Wheat in North China Plain

Agronomy ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 312 ◽  
Author(s):  
Amara Cisse ◽  
Adnan Arshad ◽  
Xiaofen Wang ◽  
Fanta Yattara ◽  
Yuegao Hu
Keyword(s):  
Grain Yield ◽  
North China Plain ◽  
North China ◽  
Farm Yard Manure ◽  
Grain Yields ◽  
The North ◽  
The North China Plain ◽  
Pig Farm ◽  
1000 Grain Weight

The effects of long-term incorporation of organic manure and biofertilizers have been investigated on winter wheat in the North China Plain (NCP). The five-year field experiment (2013–2018) has illustrated the responses of grain yield and yield components. Seven fertilization approaches, included pig farm-yard-manure and biofertilizers amendments combined with five NPK% drop levels of chemical fertilizer ratio + organic fertilizer + biofertilizer (0, C+O+B) 25%, CL4; 50%, CL3; 75%, CL1; and 100%, CL0), without fertilizer as control (CK), in NCP during the years 2013–2018. Results showed that the grain yields of CL1 and CL2 were equivalent to CL0 in all growing seasons except 2014/2015. The grain yields of CL4 were 29.9% to 46.6% lower than that of CL0 during 2014/2015, 2016/2017, and 2017/2018. The valuable spike-number, grain number per-spike, and 1000-grain weight showed significant variations among different growing periods. Regression analysis of grain yield and yield components indicated that number grains per-spike showed significant increase in seed yield formation. The 1000-grain weight was the major parameter that influenced yield of moderate and low yielding periods, respectively. The results revealed that application of 30 m3 ha−1 pig farm-yard-manure and 20 kg ha−1 biofertilizers has reduced at least 50% of the NPK fertilization without dropping grain yields in the North China Plain.

Carbon sequestration and mineralization in soil aggregates under long-term conservation tillage in the North China Plain

CATENA ◽  
2020 ◽  
Vol 188 ◽  
pp. 104428 ◽  
Author(s):  
Zheng-Rong Kan ◽  
Shou-Tian Ma ◽  
Qiu-Yue Liu ◽  
Bing-Yang Liu ◽  
Ahmad Latif Virk ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
North China Plain ◽  
North China ◽  
Conservation Tillage ◽  
Soil Aggregates ◽  
The North ◽  
The North China Plain

scholarly journals Measurement report: Variations in surface SO<sub>2</sub> and NO<sub>x</sub> mixing ratios from 2004 to 2016 at a background site in the North China Plain

2022 ◽  
Author(s):  
Xueli Liu ◽  
Liang Ran ◽  
Weili Lin ◽  
Xiaobin Xu ◽  
Zhiqiang Ma ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Diurnal Variations ◽  
Nox Emission ◽  
Mixing Ratios ◽  
The North ◽  
The North China Plain ◽  
Regional Background ◽  
Long Term Trends

Abstract. Strict air pollution control strategies have been implemented in recent decades in the North China Plain (NCP), previously one of the most polluted regions in the world, and have resulted in considerable changes in emissions of air pollutants. However, little is so far known about the long-term trends of the regional background level of NOx and SO2, along with the increase and decrease processes of regional emissions. In this study, the seasonal and diurnal variations of NOx and SO2 as well as their long-term trends at a regional background station in the NCP were characterized from 2004 to 2016. On average, SO2 and NOx mixing ratios were 5.7 ± 8.4 ppb and 14.2 ± 12.4 ppb, respectively. The seasonal variations in SO2 and NOx mixing ratios showed a similar pattern with a peak in winter and a valley in summer. However, the diurnal variations in SO2 and NOx mixing ratios greatly differed for all seasons, indicating different sources for SO2 and NOx. Overall, the annual mean SO2 exhibited a significant decreasing trend of ‒6.1 % yr−1 (R = −0.84, P < 0.01) from 2004 to 2016, which is very close to −6.3 % yr−1 of the annual SO2 emission in Beijing, and a greater decreasing trend of −7.4 % yr−1 (R = −0.95, P < 0.01) from 2008 to 2016. The annual mean of NOx showed a fluctuating rise of +3.4 % yr−1 (R = 0.38, P = 0.40) from 2005 to 2010, reaching the peak value (16.9 ppb) in 2010, and then exhibited an extremely significant fluctuating downward trend of −4.5 % yr−1 (R = 0.95, P < 0.01) from 2010 to 2016. After 2010, the annual mean NOx mixing ratios correlated significantly (R = 0.94, P < 0.01) with the annual NOx emission in North China. The decreasing rate (−4.8 % yr−1, R = −0.92, P < 0.01) of the annual mean NOx mixing ratios from 2011 to 2016 at SDZ are lower than the one (−8.8 % yr−1, R = −0.94, P < 0.01) for the annual NOx emission in the NCP and (−9.0 % yr−1, R = −0.96, P < 0.01) in Beijing. It indicated that surface NOx mixing ratios at SDZ had weaker influence than SO2 by the emission reduction in Beijing and its surrounding areas in the NCP. The increase in the amount of motor vehicles led to an increase in traffic emissions for NOx. This study supported conclusions from previous studies that the measures taken for controlling NOx and SO2 in the NCP in the past decades were generally successful. However, NOx emission control should be strengthened in the future.

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