Future increases in irrigation water requirement challenge the water-food nexus in the northeast farming region of China

Xu, Hanqing; Tian, Zhan; He, Xiao-Gang; Wang, Jun; Sun, Lei; Fischer, G.; Fan, Dongli; Zhong, Honglin; Wu, Wei; Pope, Edward; Kent, Chris; Liu, Junguo

doi:10.1016/j.agwat.2018.10.045

Cited by 51 publications

(15 citation statements)

References 37 publications

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“…The result showed that drip fertigation improved soil water and increased maize yield and water use efficiency. Among those studies, the effects of erosion on the processes of crop growth and WUE are rarely stated, and many studies focused on the crops are maize [38,[43][44][45][46][47], and wheat [46].…”

Section: Introductionmentioning

confidence: 99%

Water Use Efficiency of Soybean under Water Stress in Different Eroded Soils

Xie

Liu

et al. 2020

Water

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Soil erosion could change the effective storage of soil moisture and affected crop water use efficiency (WUE). To quantitative study differences in the WUE of soybean and the crop’s response to water stress for soils with different degrees of erosion in northeastern China, three erosion degrees—(1) lightly, (2) moderately and (3) severely—eroded black undisturbed soils and four years (from 2013 to 2016) of soybean pot experiments were used to control soil water content (100%, 80%, 60%, and 40% field capacity (FC)) and observe the crop growth processes. To study the relationships between erosion–water use–productivity, the following results were achieved: (1) the optimal water content was 80% FC for lightly eroded soil (L) and 100% FC for both moderately (M) and severely (S) eroded soil. Yield (Y) was best in M with the value of 3.12 t ha−1, which was 4.6% and 85.5% higher than L and S, respectively. Under the conditions of adequate water supply, there was no significant change in Land M, but the values were significantly different for the S ( p < 0.05). (2) Y and biomass (B) were sensitive to water stress except in the branching stage. (3) The values of WUEY and WUEB for the three eroded soils were the best at 80% FC. The stress coefficient (SF) values of the three eroded soils were not significantly different. In the flowering and pod formation stage, the SF reached the maximum under waterlogging stress. While the water shortage stress reached the maximum in the seed filling stage, the soil water content decreased by 10%, and the WUEB decreased by 15%, which was 2.5 times more powerful than the waterlogging stress. This study indicated the change in soybean growth with respect to the water response caused by soil erosion, and provided a scientific basis and data for the reasonable utilization of black soil with different erosion intensities. The results also provided important parameters for the growth of simulated crops.

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Section: Introductionmentioning

confidence: 99%

Water Use Efficiency of Soybean under Water Stress in Different Eroded Soils

Xie

Liu

et al. 2020

Water

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“…Those regions have the most elevated amount of irrigation water requirements. The increase is highest in the RCP 8.5 scenario than RCP 4.5 scenario as Hanqing Xu [52] concludes. If the country is specified, Tianwa Zhou [53] shows that the irrigation water requirement in his study area which is western Inner Mongolia in China is expected to be 648 mm under scenario A2 and 639 mm under B2.…”

Section: Discussionmentioning

confidence: 90%

The Global Trend of the Net Irrigation Water Requirement of Maize from 1960 to 2050

Abdoulaye

Lü

Zhu

et al. 2019

Climate

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Irrigated production around the world has significantly increased over the last decade. However, climate change is a new threat that could seriously aggravate the irrigation water supplies and request. In this study, the data is derived from the IPCC Fifth Assessment Report (AR5). For the climate change scenarios, five Global Climate Models (GCMs) have been used. By using the CROPWAT approach of Smith, the net irrigation water requirement (IRnet) was calculated. For the estimation of the potential evapotranspiration (Epot), the method in Raziei and Pereira was used. According to representative concentration pathway (RCP) 4.5, these increases vary between 0.74% (North America) and 20.92% (North America) while the RCP 8.5 predict increases of 4.06% (sub-Saharan Africa) to more than 68% (North America). The results also show that the region of Latin America is the region with the large amount of IRnet with coprime value between 1.39 km3/yr (GFDL 4.5) and 1.48 km3/yr (CSIRO 4.5) while sub-Saharan Africa has the smallest IRnet amount between 0.13 km3/yr (GFDL 8.5) and 0.14 km3/yr (ECHAM 8.5). However, the most affected countries by this impact are those in sub-Saharan Africa. This study will probably help decision-makers to make corrections in making their decision.

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“…Water consumption for agricultural production, as an important component of the food-water-energy (FEW) nexus, has been a hot issue in academic research [ 8 ]. Many scholars have focused on assessing water use for irrigation during agricultural production using models [ 9 , 10 , 11 ], while some scholars also invoke the concepts of water footprint, which integrates irrigation water, or blue water, as well as natural precipitation, or green water, and water used to dilute agricultural pollutants, or grey water, to comprehensively and systematically analyze the water footprints and the differences in their components at different spatial scales or different crop types [ 12 , 13 , 14 , 15 , 16 ]. At the same time, energy consumption for agricultural production has also attracted the attention of many scholars.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Water-Energy Coupling Relationship in Grain Production: A Case Study of the North China Plain

Wang

Xiao

et al. 2022

IJERPH

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Water consumption and energy consumption are inevitable in grain production, but few studies have focused on the integrated assessment of these two indicators and their relationships. To address the research deficiency, taking the North China Plain (NCP) as a case study, this paper quantifies the changes in grain crop planting structure and the accompanying changes in irrigation water consumption (IWC) and energy consumption (EC) in the NCP. On this basis, the water-energy coupling index (CI) is constructed to analyze the water-energy coupling relationship in the context of grain crop planting structure change. The results revealed that the sown area of three of the four main grain crops in the NCP, namely winter wheat, summer maize, and rice, roughly increased in the south and decreased in the north, while the sown area of spring maize increased in most counties where it was planted in the NCP from 2000 to 2015. With the change of grain crop planting structure, IWC and EC of winter wheat in the NCP decreased by 19.87 × 106 m3 and 16.78 × 108 MJ, respectively, mainly distributed in the Beijing-Tianjin-Hebei region, while IWC and EC of other crops all increased. In terms of CI values, although that of spring maize increased, those of winter wheat, summer maize, and rice all decreased, and the overall CI values of grain production in the NCP decreased from 0.442 in 2000 to 0.438 in 2015, indicating that grain crop distribution has been optimized toward a less water- and energy-intensive and more sustainable layout in the NCP. This paper can add case and methodological support to the food-water-energy (FEW) nexus research and can also provide policy suggestions for regional crop optimization layout and conservation of both water and energy resources.

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Future increases in irrigation water requirement challenge the water-food nexus in the northeast farming region of China

Cited by 51 publications

References 37 publications

Water Use Efficiency of Soybean under Water Stress in Different Eroded Soils

Water Use Efficiency of Soybean under Water Stress in Different Eroded Soils

The Global Trend of the Net Irrigation Water Requirement of Maize from 1960 to 2050

Changes in the Water-Energy Coupling Relationship in Grain Production: A Case Study of the North China Plain

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