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Impact of climate change on maize yield in China from 1979 to 2016
WU Jian-zhai, ZHANG Jing, GE Zhang-ming, XING Li-wei, HAN Shu-qing, SHEN Chen, KONG Fan-tao
2021, 20 (1): 289-299.   DOI: 10.1016/S2095-3119(20)63244-0
Abstract168)      PDF in ScienceDirect      
Climate change severely impacts agricultural production, which jeopardizes food security.  China is the second largest maize producer in the world and also the largest consumer of maize.  Analyzing the impact of climate change on maize yields can provide effective guidance to national and international economics and politics.  Panel models are unable to determine the group-wise heteroscedasticity, cross-sectional correlation and autocorrelation of datasets, therefore we adopted the feasible generalized least square (FGLS) model to evaluate the impact of climate change on maize yields in China from 1979–2016 and got the following results: (1) During the 1979–2016 period, increases in temperature negatively impacted the maize yield of China.  For every 1°C increase in temperature, the maize yield was reduced by 5.19 kg 667 m–2 (1.7%).  Precipitation increased only marginally during this time, and therefore its impact on the maize yield was negligible.  For every 1 mm increase in precipitation, the maize yield increased by an insignificant amount of 0.043 kg 667 m–2 (0.014%).  (2) The impacts of climate change on maize yield differ spatially, with more significant impacts experienced in southern China.  In this region, a 1°C increase in temperature resulted in a 7.49 kg 667 m–2 decrease in the maize yield, while the impact of temperature on the maize yield in northern China was insignificant.  For every 1 mm increase in precipitation, the maize yield increased by 0.013 kg 667 m–2 in southern China and 0.066 kg 667 m–2 in northern China.  (3) The resilience of the maize crop to climate change is strong.  The marginal effect of temperature in both southern and northern China during the 1990–2016 period was
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The effect of lactic acid bacteria inoculums on in vitro rumen fermentation, methane production, ruminal cellulolytic bacteria populations and cellulase activities of corn stover silage
GUO Gang, SHEN Chen, LIU Qiang, ZHANG Shuan-lin, SHAO Tao, WANG Cong, WANG Yong-xin, XU Qing-fang, HUO Wen-jie
2020, 19 (3): 838-847.   DOI: 10.1016/S2095-3119(19)62707-3
Abstract138)      PDF in ScienceDirect      
The objective of this study was to investigate the effect of lactic acid bacteria (LAB) inoculums on fermentation quality and in vitro digestibility of corn stover silage. Corn stover was ensiled without (control) or with Lactobacillus plantarum (LP), Enterococcus faecalis (EF), and Enterococcus mundtii (EM) for 45 days. The fermentation characteristics were assessed, and subsequent in vitro dry matter digestibility (DM-D), neutral detergent fiber digestibility (NDF-D), volatile fatty acids (VFA), methane (CH4 ) production, cellulolytic bacteria proportions and their activities per corn stover silage were also determined. There was no significant difference (P>0.05) among the silage pH, lactic acid, crude protein (CP), water soluble carbohydrates (WSC) and lignocelluloses contents of different treatments. The relative proportions of Ruminococcus flavefaciens and Fibrobacter succinogenes, carboxymethyl-ocellulose and β-glycosidase activities, DM-D, NDF-D, and VFA production of in vitro incubation was higher (P<0.05) for silages inoculated with LP and EF than those of the control silage. Silage inoculated with LP showed the lowest (P<0.05) CH4 production per unit yield of VFA, which was positively corresponded to the lowest (P<0.05) ratio of acetate to propionate. In summary, the ensiling fermentation quality and subsequent utilization of corn stover silage were efficiently improved by inoculated with L. plantarum.
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Transcriptome response of wheat Norin 10 to long-term elevated CO2 under high yield field condition
LIN Yue-bing, SHEN Cheng-guo, LIN Er-da, HAO Xing-yu, HAN Xue
2016, 15 (9): 2142-2152.   DOI: 10.1016/S1671-2927(00)10702
Abstract1312)      PDF in ScienceDirect      
The increasing atmospheric carbon dioxide concentration, caused by fossil fuel combustion and deforestation, plays an important role in plant growth and development. Wheat, as a major staple crop, adapts to climate change by tuning its inherent molecular mechanism, which is not well understood. The present study employed the RNA-Seq method to generate transcriptome profiles of the wheat Norin 10 in response to elevated CO2 in comparison with ambient CO2. The 10 895 787 high-quality clean reads of Norin 10 were assembled de novo using Trinity (without a reference genome) resulting in a total of 18 206 candidate transcripts with significant BLAST matches. GO enrichment analysis of Norin 10 at different CO2 concentrations showed that some functional genes related to plastids, precursor metabolites, and energy, thylakoid and photosynthesis were apparently enriched at elevated CO2 (550 μmol mol–1) in contrast to that at ambient CO2 (400 μmol mol–1); these findings were further confirmed by RT-PCR analysis. The findings demonstrated the specific effects of elevated CO2 during long-term period in free air CO2 enrichment (FACE) on transcriptome response of the high yielding wheat variety, Norin 10, which has a large spike.
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