5 results on '"Zhang, Weijian"'
Search Results
2. Water management to mitigate the global warming potential of rice systems: A global meta-analysis.
- Author
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Jiang, Yu, Carrijo, Daniela, Huang, Shan, Chen, Ji, Balaine, Nimlesh, Zhang, Weijian, van Groenigen, Kees Jan, and Linquist, Bruce
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WATER management , *GLOBAL warming , *META-analysis , *RICE yields , *GREENHOUSE gases , *NITROUS oxide , *METHANE - Abstract
Highlights • A meta-analysis on GHG emissions and rice yield as affected by water management. • Non-continuous flooding reduced CH 4 emissions by 53%, but it increased N 2 O emissions by 105%. • Severe soil drying reduced rice yield, but mild soil drying did not. • Non-continuous flooding reduced GWP by 44% and yield-scaled GWP by 42%. • IPCC underestimates the impact of multiple (i.e. ≥ 2) drying events on CH 4 emissions. Abstract Rice is a main staple food for roughly half of the world's population, but rice agriculture is also a main source of anthropogenic greenhouse gas (GHG) emissions. Many studies have reported that water management (e.g. alternate wetting and drying, intermittent irrigation, mid-season drain, aerobic rice) affects rice yields and methane (CH 4) and nitrous oxide (N 2 O) emissions from rice paddies. However, these studies span a variety of practices and vary in experimental design and results, making it difficult to determine their global response from individual experiments. Here we conducted a meta-analysis using 201 paired observations from 52 studies to assess the effects of water management practices on GHG emissions and rice yield. Overall, compared to continuous flooding, non-continuous flooding practices reduced CH 4 emissions by 53%, increased N 2 O emissions by 105%, and decreased yield by 3.6%. Importantly, N 2 O emissions were low, contributing, on average, 12% to the combined global warming potential (GWP; CH 4 + N 2 O). As a result, non-continuous flooding reduced GWP (-44%) and yield-scaled GWP (-42%). However, non-continuous flooding practices stimulated N 2 O emissions to a greater degree in soils with high organic carbon or with manure additions. The reduction in CH 4 emissions increased with the number of drying events, soil drying severity, and the number of unflooded days. Currently, Intergovernmental Panel on Climate Change (IPCC) scaling factors for single and multiple (≥ 2) drying events are 0.6 and 0.52. Based on this analysis using actual side-by- side field studies, we suggest changing these to 0.67 for a single event and 0.36 for multiple events. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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3. Nighttime warming increases winter-sown wheat yield across major Chinese cropping regions.
- Author
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Zheng, Chengyan, Zhang, Jun, Chen, Jin, Chen, Changqing, Tian, Yunlu, Deng, Aixing, Song, Zhenwei, Nawaz, Muhammad Mohsin, van Groenigen, Kees Jan, and Zhang, Weijian
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WINTER wheat , *GRAIN yields , *CROP yields , *EFFECT of global warming on plants , *WHEAT breeding , *CROPPING systems - Abstract
Understanding the actual impacts of climatic warming on winter-sown wheat production will benefit cultivar breeding efforts and agronomic innovations and may help to improve food security. Therefore, we conducted a comprehensive study across the main Chinese winter wheat cropping regions, comprising field warming experiments at four locations and an analysis of 36 years of winter wheat yield data. In the field warming experiments, an increase of 1.0 °C in nighttime temperature enhanced wheat yield by 10.1% on average ( P < 0.05 ). Warming-induced enhancement of 1000-grain weight explained most of these yield increases. Warming shortened the length of pre-flowering phase by 5.4 days, while it prolonged the length of post-flowering phase by 3.8 days. Grain yield increases with warming were similar across experimental sites, even though warming-induced changes in the length of growth periods decreased with increasing ambient temperature. Our analysis of the historical data set was consistent with our field warming experiments; between 1980 and 2015, the major Chinese cropping regions experienced significant warming, especially in daily minimum temperature. Across the historical data set, daily minimum temperature was positively correlated with wheat yield (142.0 kg ha −1 °C −1 ). Our findings are inconsistent with previous reports of yield decreases with warming and may help to inform policy decisions and agronomic innovations of Chinese wheat production to better cope with future climate warming. [ABSTRACT FROM AUTHOR]
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- 2017
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4. Warming impacts on winter wheat phenophase and grain yield under field conditions in Yangtze Delta Plain, China
- Author
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Tian, Yunlu, Chen, Jin, Chen, Changqing, Deng, Aixing, Song, Zhenwei, Zheng, Chengyan, Hoogmoed, Willem, and Zhang, Weijian
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WINTER wheat , *GRAIN yields , *BIOMASS , *PLANT canopies , *PLANT communities , *GRAIN harvesting , *GLOBAL warming - Abstract
Abstract: A five-year experiment with Free Air Temperature Increase facility was conducted to investigate the actual responses of winter wheat phenophase and yield to warming in Yangtze Delta Plain, China. Air temperature increase of around 1.5°C in wheat canopy advanced crop phenophases significantly, leading to a reduction in length of the entire growth period by 10 days (P <0.05). This reduction was mainly found in the length of pre-anthesis phase, while the length of post-anthesis phase was prolonged slightly. Warming increased grain yield by 16.3% (P <0.05) whereas no significant effects were found on the aboveground biomass. Warming tended to increase the numbers of productive spike and filled grain and the harvest index. The areas of flag leaf and total green leaf at anthesis and the 1000-grain weight were 36.0, 19.2 and 5.9% higher in the warmed plots than the un-warmed control (P <0.05), respectively. Warming stimulated the filling rate of inferior grain (P <0.05), while the rate of superior grain stayed almost unchanged. The above evidences suggest that anticipated warming may facilitate winter wheat production in East China. [Copyright &y& Elsevier]
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- 2012
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5. Responses of biomass growth and grain yield of midseason rice to the anticipated warming with FATI facility in East China
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Dong, Wenjun, Chen, Jin, Zhang, Bin, Tian, Yunlu, and Zhang, Weijian
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RICE , *CROP growth , *CROP yields , *GRAIN , *EFFECT of global warming on plants , *PLANT biomass , *TEMPERATURE , *EXPERIMENTAL agriculture - Abstract
Abstract: Crop model projections and historical data analyses have shown that global warming may cause serious decrease in crop productivity, however, many uncertainities remain on the impact quantification due to the unclear understanding of actual crop response. Therefore, we performed a three-year field warming experiment with free air temperature increase (FATI) facility to investigate the actual response of midseason rice growth in East China. There were four treatments (AW: all-day warming; DW: daytime warming; NW: nighttime warming; CK: ambient control) with three replicates. This FATI facility presented a good simulation of the local air temperature pattern with an increase in the daily mean temperature of about 1.1–2.0°C during rice whole growth duration compared to the ambient control. Warming shortened the pre-heading phase respectively by 3.3d, 1.7d and 2.0d in the AW, DW and NW plots, while the post-heading phase stayed almost unchanged. During the three years, warming slightly decreased the aboveground biomass by an average of 9.1%, 10.3% and 3.3%, and the grain yield by an average of 0.9%, 6.4% and 6.1% in the AW, DW and NW plots, respectively. Warming tended to decrease rice photosynthesis rate and stimulate the nighttime respiration rate. It also enlarged the flag leaf area and increased its chlorophyll content. No significant difference and interaction in the actual response of rice growth were found between the warming regimes. The above evidences suggest that the expected warming less than 2.0°C may not cause significant decrease in rice productivity in East China. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
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