Ecological risks of insecticide contamination in water and sediment around off-farm irrigated rice paddy fields

2019 ◽  
Vol 251 ◽  
pp. 628-638 ◽  
Author(s):  
Shunsuke Furihata ◽  
Atsushi Kasai ◽  
Kazumasa Hidaka ◽  
Makihiko Ikegami ◽  
Hitoshi Ohnishi ◽  
...  
Keyword(s):  
Rice Paddy ◽  
Paddy Fields ◽  
Ecological Risks ◽  
Irrigated Rice ◽  
Water And Sediment ◽  
Rice Paddy Fields

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

2021 ◽  
Author(s):  
Hiroki Ikawa ◽  
Tsuneo Kuwagata ◽  
Shigenori Haginoya ◽  
Yasushi Ishigooka ◽  
Keisuke Ono ◽  
...  
Keyword(s):  
Land Use ◽  
Energy Balance ◽  
Air Temperature ◽  
Rice Paddy ◽  
Paddy Fields ◽  
Balance Model ◽  
Rice Paddies ◽  
Irrigated Rice ◽  
Rice Paddy Fields ◽  
Crop Energy

AbstractKnown 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.

scholarly journals Dry matter accumulation and plant type of the high yielding soybean grown under converted rice paddy fields.

1984 ◽  
Vol 53 (4) ◽  
pp. 510-518 ◽  
Author(s):  
Kimio NAKASEKO ◽  
Humio NOMURA ◽  
Kanji GOTOH ◽  
Takeshi OHNUMA ◽  
Yoshikatsu ABE ◽  
...  
Keyword(s):  
Dry Matter ◽  
Rice Paddy ◽  
Paddy Fields ◽  
Dry Matter Accumulation ◽  
Plant Type ◽  
Rice Paddy Fields

Regional and Temporal Characteristics of Aquatic Organism Communities in Rice Paddy Fields, using Submerged Funnel Trap

2018 ◽  
Vol 36 (2) ◽  
pp. 99-106
Author(s):  
Sung-Soo Yoon ◽  
Myung-Hyun Kim ◽  
Jinu Eo ◽  
Soon-Ik Kwon ◽  
Hyung-Kyu Nam ◽  
...  
Keyword(s):  
Aquatic Organism ◽  
Rice Paddy ◽  
Paddy Fields ◽  
Temporal Characteristics ◽  
Funnel Trap ◽  
Rice Paddy Fields
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