Influence mechanism of climate change on paddy farming practices and irrigation water demand

Cho, Gun-Ho; Ahmad, Mirza Junaid; Lee, Seulgi; Choi, Kyung-Sook; Nam, Won‐Ho; Kwon, Hyung-Joong

doi:10.1007/s10333-019-00731-4

Cited by 10 publications

(16 citation statements)

References 27 publications

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“…According to the annual statistical report for 2018 by OECD, the general service support transfers, which were linked to measures setting out enabling conditions for primary agricultural sectors through the development of water infrastructure and private or public services, amounted to 3639 million USD; thus, ranking third among the thirty-five OECD member countries [53]. Approximately, more than 80% of Korea's paddy production is supported by over 18,000 agricultural reservoirs and 70,000 other irrigation facilities [20]. The well-maintained and accessible water infrastructure in the agricultural sector could protect cropland against water-deficit stress caused by prolonged dry periods, which might be one reason for the weak correlations between FFTD, the linear distance of rice fields from river/stream systems, and air temperature.…”

Section: Discussionmentioning

confidence: 99%

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Contribution of Biophysical Factors to Regional Variations of Evapotranspiration and Seasonal Cooling Effects in Paddy Rice in South Korea

Wang

Jeong

et al. 2021

Remote Sensing

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Previous studies have observed seasonal cooling effects in paddy rice as compared to temperate forest through enhanced evapotranspiration (ET) in Northeast Asia, while rare studies have revealed biophysical factors responsible for spatial variations of ET and its cooling effects. In this study, we adopted a data fusion method that integrated MODIS 8-day surface reflectance products, gridded daily climate data of ground surface, and a remote sensing pixel-based Penman-Monteith ET model (i.e., the RS–PM model) to quantify ET patterns of paddy rice in South Korea from 2011 to 2014. Results indicated that the regional variations of the rice-growing season ET (RGS-ET, the sum of daily ET from the season onset of rapid canopy expansion (SoS) to the end of the rice-growing season (EGS)) were primarily influenced by phenological factors (i.e., the length of growing period-LGP), followed by growing season mean climatic factors (i.e., vapor pressure deficit-VPD, and air temperature). For regional variations of the paddy field ET (PF-ET, the sum of daily ET from the field flooding and transplanting date detected by satellite observations (FFTDsat) to SoS, and to EGS), the extents were substantially reduced, only accounting for 54% of the RGS-ET variations. The FFTDsat and SoS were considered critical for the reduced PF-ET variations. In comparison to the temperate forest, changes in monthly ground surface air temperature (Ts) in paddy fields showed the V-shaped seasonal pattern with significant cooling effects found in late spring and early summer, primarily due to a large decline in daytime Ts that exceeded the nighttime warming. Bringing FFTDsat towards late spring and early summer was identified as vital field management practices, causing significant declines in daytime Ts due to enhanced ET. Results highlighted climate-warming mitigation by paddy fields due to early flooding practices.

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Section: Discussionmentioning

confidence: 99%

“…Paddy rice in Asian countries is commonly associated with small-scale subsistence production systems [16,17]. Various irrigation schedules regarding the FFTD evolve among rice land parcels in South Korea, North China, and Japan [18][19][20][21]. The LAI seasonal effects might be concealed by advancing the FFTD.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Biophysical Factors to Regional Variations of Evapotranspiration and Seasonal Cooling Effects in Paddy Rice in South Korea

Wang

Jeong

et al. 2021

Remote Sensing

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“…Climate change is a major dilemma faced by humanity during the last few decades, and it has serious ramifications for water resource management, irrigation water supplies, and crop water demands. Hydrologic implications of climate change brunt are frequently witnessed including extreme events such as heavy rainfalls, heat waves, floods and droughts [1][2][3][4][5][6]. The climate change predicament is distinctively severe in Korea compared to the rest of the world, and spatiotemporal temperature and rainfall variation are reshaping the watershed environment, runoff generation, irrigation water supplies and crop water demands [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Severe droughts struck Korea every 6-7 years during the 20th century; however, after 2000, there have been consecutive droughts during 2013-2018 [12]. The decline in monsoon rainfall in the rice season is the main cause of drought, and has resulted in restricted runoff gen-2 of 16 eration in the watershed, and the inability of agricultural reservoirs to meet irrigation demands [4,13].…”

Section: Introductionmentioning

confidence: 99%

“…The design criterion for Korean agricultural reservoirs is to meet the water requirements of a 10-year frequency drought, but most old reservoirs often fail to maintain a reliable water supply due to seasonal rainfall variations or lack of proper care and maintenance [4,24]. Hence, the design criteria for the agricultural reservoir should be re-evaluated and revised to accommodate the climate-instigated uncertainties in the upstream watershed runoff generation and downstream water demands [25,26].…”

Section: Introductionmentioning

confidence: 99%

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Water Supply Reliability of Agricultural Reservoirs under Varying Climate and Rice Farming Practices

Cho

Ahmad

Choi

2021

Water

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Technological development and climate change dictate farming practices, which can directly affect irrigation water requirement and supply. In this article, the water supply reliability (WSR) of 62 major Korean agricultural reservoirs was comprehensively evaluated for varying climate and farming practices. Field surveys identified the recent divergence from standard rice farming practices and a 45-year daily weather data set (1973–2017) was examined to understand the phenomenon of climate change. Effective rainfall increments mitigated the imminent surges in rice irrigation water requirements driven by warming-led accelerated crop evapotranspiration rates; therefore, climate change marginally influenced the WSR of selected reservoirs. The transplanting period and associated water consumption were the primary deviations from standard rice farming practices. A significantly prolonged transplanting period seriously compromised the WSR of agricultural reservoirs and the maximum number of unsafe reservoirs was detected for a 24-day increase in the transplanting period. A watershed/irrigated area ratio of less than 2.5 was the lower threshold below which all the reservoirs had unsafe WSR regardless of the climate change and/or farming practices. Recent variations in farming practices were the primary cause of reservoir failure in maintaining the WSR.

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Local strategies to manage groundwater depletion under climate change scenarios—a case study: Hamedan-Bahar Plain (Iran)

2021

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Influence mechanism of climate change on paddy farming practices and irrigation water demand

Cited by 10 publications

References 27 publications

Contribution of Biophysical Factors to Regional Variations of Evapotranspiration and Seasonal Cooling Effects in Paddy Rice in South Korea

Contribution of Biophysical Factors to Regional Variations of Evapotranspiration and Seasonal Cooling Effects in Paddy Rice in South Korea

Water Supply Reliability of Agricultural Reservoirs under Varying Climate and Rice Farming Practices

Local strategies to manage groundwater depletion under climate change scenarios—a case study: Hamedan-Bahar Plain (Iran)

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