Temperature Difference between Meteorological Station and Nearby Farmland –Case Study for Kumagaya City in Japan–

et al. 2015

J. Agric. Meteorol.

Self Cite

Crop phenology models play a pivotal role in predicting yields under climate change. Cultivar-specific model parameters are essential for accurate prediction, but their estimation generally requires elaborate and laborious experiments, and such parameter sets have therefore been available only for a small number of cultivars. We propose methodology for estimating phenological parameters, combining a stochastic parameter estimation method (genetic algorithm) with the use of a database comprising 30 years of records from variety trials conducted at experimental stations across Japan. Optimal parameter sets were selected based on the results of cross-validation tests. This methodology allowed us to estimate phenological parameters objectively. We estimated phenological parameters for the 10 leading cultivars currently planted in Japan, and showed that these parameters reflect the cultivars' sensitivity to temperature and/or photoperiod. The proposed methodology can be used to provide quantitative evaluations of the environmental responses of rice cultivars, without relying on elaborate and laborious experiments, and substantially improves the efficiency of phenological trait phenotyping.

Section: Discussionmentioning

confidence: 99%

A methodology for estimating phenological parameters of rice cultivars utilizing data from common variety trials

Fukui

Ishigooka

et al. 2015

J. Agric. Meteorol.

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“…In contrast, the temperature difference between the two sites during the wheat or barley growing season mid-November to early June was not as large. Other studies have also reported differences in the daytime temperature of over 1 C between urban areas and rice paddy fields Sakakibara, 1994;Sakakibara et al, 1996;Sakakibara and Morita, 2002;Wakiyama, 2007. Kuwagata et al 2014 suggested that the daytime temperature difference between the urban area and the rice paddy field may have been increased by greater heat loss due to evapotranspiration at the rice paddy field during the paddy rice growing season.…”

Section: Introductionmentioning

confidence: 94%

“…Agriculture is strongly influenced by meteorological conditions, and their variations in farmland areas are among the basic environmental factors that affect crop production. Although meteorological data measured at meteorological stations of the Japan Meteorological Agency JMA are commonly used in Japan for assessing both the impact of climate change on crop production and crop management practices Seino, 1993;Hasegawa et al, 2011;Ishigooka et al, 2011;Kuwagata et al, 2011;Fukuoka and Yoshimoto, 2012;Ohno et al, 2016 , many of these meteorological stations are in urban areas whereas relatively few are in farmland areas Nishimori et al, 2009;Murakami et al, 2011;Kuwagata et al, 2014 . Local land cover affects meteorological conditions at an observation site by changing the local-scale and microscale environment at the site Fujibe, 2012;Kondo, 2012Kondo, , 2016 In urban areas, meteorological conditions are commonly influenced by the urban heat island effect, and the land cover grass, bare soil, asphalt, etc. adjacent to an observation site also influences micrometeorological conditions at the site.…”

Section: Introductionmentioning

confidence: 99%

“…adjacent to an observation site also influences micrometeorological conditions at the site. Moreover, temperature differences have been reported to exist year-round between JMA meteorological stations and nearby farmland sites Sakakibara and Morita, 2002;Fukuoka and Yoshimoto, 2012;Kuwagata et al, 2014;Kondo, 2016 . Kumagaya City 36.15 N, 139.38 E, 30 m above mean sea level [ a.s.l. ]…”

Section: Introductionmentioning

confidence: 99%

“…is one of the hottest cities in Japan during summer, and its urban area about 5 km 5 km is surrounded by farmland, where double cropping rice-wheat/barely is practiced. Kuwagata et al 2014 examined the seasonal variation in the temperature difference between the urban area and a nearby farmland site. The daily mean and the maximum and minimum temperatures were higher at the urban site than at the farmland site across all seasons.…”

Section: Introductionmentioning

confidence: 99%

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Influence of local land cover on meteorological conditions in farmland: Case study of a rice paddy field near Tsukuba City, Japan

Haginoya²,

Ono

et al. 2018

J. Agric. Meteorol.

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In farmland areas, meteorological conditions affect crop growth and physiology. We examined the influence of seasonal changes in local agricultural land cover on meteorological conditions of farmland in a rural area of Tsukuba City, a medium-sized city in Japan, by comparing conditions in the rural area with those in the urban and suburban areas horizontal scale ~10 km of Tsukuba City. The daily mean temperature at a rural farmland site single cropping system: paddy rice in summer, bare soil in winter was 0 3 C lower than that at an urban site observational field at the Meteorological Research Institute, about 7 km from the farmland site , depending on the season annual mean 1.07 C during 2004 2006 . The daily mean water vapor pressure deficit at the farmland site was also smaller than that at the urban site across all seasons, and it was markedly lower during the rice-growing period May to mid-September , resulting in a more humid climate at the farmland site during this period. During the paddy rice-growing period, day-to-day differences in daytime temperature and water vapor pressure between the farmland and urban sites tended to increase with daily solar radiation, and were closely related to the day-to-day difference in daytime sensible and latent heat fluxes between the two sites. During the fallow period late September to April , the difference in daily minimum temperature between the two sites tended to increase with possible radiative cooling and became larger under weak wind conditions.

Heat-Mitigation Effects of Irrigated Rice-Paddy Fields Under Changing Atmospheric Carbon Dioxide Based on a Coupled Atmosphere and Crop Energy-Balance Model

Ikawa

Boundary-Layer Meteorol

Haginoya

et al. 2021

Self Cite

Known as the heat-mitigation effect, irrigated rice-paddy fields distribute a large fraction of their received energy to the latent heat during the growing season. The present hypothesis is that increased atmospheric CO2 concentration decreases the stomatal conductance of rice plants and increases the air temperature by means of an increased sensible heat flux. To test this hypothesis, a coupled regional atmospheric and crop energy-balance model is developed and applied to a 300 × 300 km2 region in Japan. Downscaling meteorological variables from grid-mean values of mixed land use (3 × 3 km2) generates realistic typical diurnal cycles of air temperature in rice paddies and adjacent residential areas. The model simulation shows that, on a typical sunny day in summer, doubling the CO2 concentration increases the daily maximum grid-mean air temperature, particularly where rice paddies are present, by up to 0.7 °C. This CO2 effect on the grid-mean air temperature is approximately half the effect of the reduction in rice-paddy area that is postulated to occur on a time scale similar to that of the atmospheric CO2 change. However, within the internal atmospheric boundary layer of the rice paddies, the CO2 effect on the air temperature (+ 0.44 °C) still exceeds the effects of the land-use change (+ 0.11 °C). These results show a potentially important interplay of plant physiological responses regarding atmospheric CO2 in the heat-mitigation effect of rice-paddy fields under a changing climate.