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Tan C.-H.,Nanjing University of Information Science and Technology | Zhao T.-L.,Nanjing University of Information Science and Technology | Cui C.-G.,Institute of Heavy Rain | Luo B.-L.,Institute of Meteorological science of Hunan Province | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

Based on the observational data of haze occurrences from 1962 to 2011, the temporal-spatial variations of haze pollution and the causes over Central China were discussed by using statistical methods, such as linear regression, cluster and correlation analysis. It was found that haze pollution occurred frequently in the areas of northern-central Henan, western-central Hubei and central Hunan, where the population was relatively dense with high aerosol concentrations. The station with the most frequent haze events was Xinxiang in Henan province, reaching 79.1 d/a. The seasonal variations showed that the heaviest haze pollution happened in winter and the slightest haze occurred in summer. Haze pollution was a typical atmospheric environment incident in winter over Central China. These seasonal differences became obscure with the increases of haze frequency in spring, summer and fall. High haze pollution was spatially centred over the urban area. The increasing and decreasing trends in haze occurrences were identified respectively in the polluted region and the relatively clean region over the recent 50years, revealing the polarization in air environment change over Central China. Haze events in Central China were highly related to the increasing anthropogenic emissions and the decreasing East Asia monsoon over the region during the past 50years. ©, 2015, Chinese Society for Environmental Sciences. All right reserved. Source


Ning J.-H.,Agro meteorological Station of Hunan Province | Ning J.-H.,Meteorological Disaster Prevention and Mitigation Key Laboratory of Hunan Province | Lu K.-D.,Institute of Meteorological science of Hunan Province | Lu K.-D.,Meteorological Disaster Prevention and Mitigation Key Laboratory of Hunan Province | And 4 more authors.
Chinese Journal of Ecology | Year: 2015

Using the data of super rice Yueyou 6135 with different sowing dates in 2011-2013, the differences of yield components between different years and sowing dates were analyzed, and the relationship models between yield components and temperature, light and their combination were established based on daily temperature and sunshine data during yield formation. The results showed that the yield component of rice with later sowing date in the same year was relatively poor, and fluctuated between different years. As the sowing date delayed, the differences in yield component of rice at the same sowing date became greater among different years. The best sowing dates were from mid-June to early July. Accumulated temperature showed a down parabola relationship with grain number per spike, and when the accumulated temperature reached 873 ºC, the grain number per spike was the highest. The accumulated temperature and sunshine had convex down relationships with empty grain rate, and had convex up relationships with seed setting rate. When 700-920 ºC accumulated temperature and ≥ 180 h sunshine were simultaneously met, super rice had higher seed setting rate and lower empty grain rate. The results of this study had important guiding significance to arrange sowing date and utilize climate resources rationally in regions of the middle and lower reaches of the Yangtze River. © 2015, editorial Board of Chinese Journal of Ecology. All rights reserved. Source


Lu K.-D.,Institute of Meteorological science of Hunan Province | Li H.-M.,Hengyang Agro meteorological Experiment Station | Huang W.-H.,Institute of Meteorological science of Hunan Province | Li Y.-C.,Meteorological Research Institute of Jiangxi Province
Chinese Journal of Ecology | Year: 2015

High and stable yield of double-cropping super rice has become an important part for national food security since 2006 when it has been promoted. However, only few studies have focused on the relationship between its ecological characteristics or production structure formation and meteorological factors. In this paper, the suitable temperature indices were studied based on the data of temperature controlled by the artificial climate chamber and field cultivation observation, in combination with analysis of the correlations between temperature and tillering rate, leaf area, biomass, grain number per spike, seed setting rate, sterile grain rate and theoretical yield in Nanchang, Jiangxi Province during 2012 to 2013. The results showed that the suitable temperature at active tillering stage ranged from 26˚C T to 28˚C T with the optimum value of 27˚C T; for the later tillering stage, the suitable temperature ranged from 25˚C T to 27˚C T with the optimum value of 26˚C T. For tillering period, unsuitable low temperature index was 18.5˚C T, while unsuitable high temperature index was 35.8˚C T. Temperature indices from this study would provide reference for reasonably arranging sowing dates so as to avoid chilling damage. © 2015, editorial Board of Chinese Journal of Ecology. All rights reserved. Source


Ning J.-H.,Agro meteorological Station of Hunan Province | Ning J.-H.,Institute of Meteorological science of Hunan Province | Lu K.-D.,Institute of Meteorological science of Hunan Province | Huo Z.-G.,Chinese Academy of Meteorological Sciences | And 2 more authors.
Chinese Journal of Ecology | Year: 2014

Conventional rice Xiangzaoxian 45 was used as test material, and waterlogged at different submergence depths (two-thirds submerged and fully submerged) for variable durations (3, 5, 7, and 9 days) at the jointing stage to investigate the influence of waterlogging stress on green leaf' s number, curly leaf' s length, leaf sheath' s length, high tillering and other morphological factors and yield components. Results showed that, in the different submergence depth treatments, the green leaf' s number had a negative correlation with the flooding time, and two-thirds of submergence had a more obvious effect than full submergence. Stems changed obviously in the full submergence treatment, while leaves changed significantly in the two-thirds of submergence. High tillering rate had a positive correlation with the flooding time. Curl leaf' s length had a negative correlation with the flooding time under the two-thirds of submergence, but a positive correlation under full submergence. Leaf sheaths among different treatments, all showing the elongation growth, were not significantly different. The different submergence stresses all increased the unfulfilled grain rate and empty grain rate, and lowered the thousand-grain weight. The treatment of two-thirds of submergence for 9 days had the severest effect, with lowest grain number (34). We discussed the adaptation mechanisms and possible causes for stems, leaves and other morphological characteristics under the different submergence stresses. The results could provide a scientific basis for flooding disaster reduction and disaster-resistant breeding of rice for the middle and lower reaches of Yangtze River. © 2014, Editorial Board of Chinese Journal of Ecology. All rights reserved. Source

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