DOI: 10.5194/hess-21-3041-2017
Scopus记录号: 2-s2.0-85021341857
论文题名: Water-food-energy nexus with changing agricultural scenarios in India during recent decades
作者: Barik B ; , Ghosh S ; , Saheer Sahana A ; , Pathak A ; , Sekhar M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 6 起始页码: 3041
结束页码: 3060
语种: 英语
Scopus关键词: Agriculture
; Atmospheric thermodynamics
; Drought
; Electric power utilization
; Energy utilization
; Food supply
; Geodetic satellites
; Groundwater
; Irrigation
; Population statistics
; Rain
; Recovery
; Water conservation
; Agricultural activities
; Agricultural purpose
; Electricity-consumption
; Gravity recovery and climate experiment satellites
; Groundwater storage
; High energy consumption
; Negative correlation
; Water availability
; Digital storage
; demand analysis
; drought
; energy use
; food availability
; food production
; food security
; GRACE
; groundwater
; irrigation system
; population density
; population growth
; rainfall
; satellite data
; water availability
; water storage
; Ganges Basin
; India
英文摘要: Meeting the growing water and food demands in a densely populated country like India is a major challenge. It requires an extensive investigation into the changing patterns of the checks and balances behind the maintenance of food security at the expense of depleting groundwater, along with high energy consumption. Here we present a comprehensive set of analyses which assess the present status of the water-food-energy nexus in India, along with its changing pattern, in the last few decades. We find that with the growth of population and consequent increase in the food demands, the food production has also increased, and this has been made possible with the intensification of irrigation. However, during the recent decade (after 1996), the increase in food production has not been sufficient to meet its growing demands, precipitating a decline in the per-capita food availability. We also find a statistically significant declining trend of groundwater storage in India during the last decade, as derived from the Gravity Recovery and Climate Experiment (GRACE) satellite datasets. Regional studies reveal contrasting trends between northern and western-central India. North-western India and the middle Ganga basin show a decrease in the groundwater storage as opposed to an increasing storage over western-central India. Comparison with well data reveals that the highest consistency of GRACE-derived storage data with available well measurements is in the middle Ganga basin. After analysing the data for the last 2 decades, we further showcase that, after a drought, the groundwater storage drops but is unable to recover to its original condition even after good monsoon years. The groundwater storage reveals a very strong negative correlation with the electricity consumption for agricultural usage, which may also be considered as a proxy for groundwater pumped for irrigation in a region. The electricity usage for agricultural purposes has an increasing trend and, interestingly, it does not have any correlation with the monsoon rainfall as computed with the original or de-trended variables. This reveals an important finding that the irrigation has been intensified irrespective of rainfall. This also resulted in a decreasing correlation between the food production and monsoon rainfall, revealing the increasing dependency of agricultural activities on irrigation. We conclude that irrigation has now become essential for agriculture to meet the food demand; however, it should be judiciously regulated and controlled, based on the water availability from monsoon rainfall, specifically after the drought years, as it is essential to recover from the deficits suffered previously. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79143
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, India; Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai, India; Department of Civil Engineering, Indian Institute of Science, Bangalore, India
Recommended Citation:
Barik B,, Ghosh S,, Saheer Sahana A,et al. Water-food-energy nexus with changing agricultural scenarios in India during recent decades[J]. Hydrology and Earth System Sciences,2017-01-01,21(6)