Time filter

Source Type

Wang J.,Nanjing Agricultural University | Zhang X.,Nanjing Agricultural University | Liu Y.,Nanjing Agricultural University | Pan X.,Nanjing Agricultural University | And 5 more authors.
PLoS ONE | Year: 2012

Background: Evaluating the net exchange of greenhouse gas (GHG) emissions in conjunction with soil carbon sequestration may give a comprehensive insight on the role of agricultural production in global warming. Materials and Methods: Measured data of methane (CH4) and nitrous oxide (N2O) were utilized to test the applicability of the Denitrification and Decomposition (DNDC) model to a winter wheat - single rice rotation system in southern China. Six alternative scenarios were simulated against the baseline scenario to evaluate their long-term (45-year) impacts on net global warming potential (GWP) and greenhouse gas intensity (GHGI). Principal Results: The simulated cumulative CH4 emissions fell within the statistical deviation ranges of the field data, with the exception of N2O emissions during rice-growing season and both gases from the control treatment. Sensitivity tests showed that both CH4 and N2O emissions were significantly affected by changes in both environmental factors and management practices. Compared with the baseline scenario, the long-term simulation had the following results: (1) high straw return and manure amendment scenarios greatly increased CH4 emissions, while other scenarios had similar CH4 emissions, (2) high inorganic N fertilizer increased N2O emissions while manure amendment and reduced inorganic N fertilizer scenarios decreased N2O emissions, (3) the mean annual soil organic carbon sequestration rates (SOCSR) under manure amendment, high straw return, and no-tillage scenarios averaged 0.20 t C ha-1 yr-1, being greater than other scenarios, and (4) the reduced inorganic N fertilizer scenario produced the least N loss from the system, while all the scenarios produced comparable grain yields. Conclusions: In terms of net GWP and GHGI for the comprehensive assessment of climate change and crop production, reduced inorganic N fertilizer scenario followed by no-tillage scenario would be advocated for this specified cropping system. © 2012 Wang et al.

Zhang X.-L.,Nanjing Agricultural University | Pan X.-J.,Nanjing Agricultural University | Xiong Z.-Q.,Nanjing Agricultural University | Wang J.-Y.,Nanjing Agricultural University | And 4 more authors.
Chinese Journal of Applied Ecology | Year: 2013

Taking a rice-wheat rotation system in the suburb of Nanjing, Jiangsu Province of East China as test object, this paper studied the fluxes of CH4 and N2O and their annual dynamics under different farming managements in 2010-2011, and the field observation data were applied to validate the process-based model, denitrification-decomposition (DNDC) model, aimed to approach the applicability of the model to this rotation system, and to use this model to simulate the effects of different environmental factors and farming managements on the global warming potentials (GWPs) of CH4 and N2O. The results showed that except in the treatment control and during wheat growth season, the simulated cumulative emissions of CH4 and N2O from the rotation system in all treatments were basically in coincide with the observed data, the relative deviations being from 7.1% to 26.3%, and thus, the DNDC model could be applied to simulate the GWPs of cumulative emissions of CH4 and N2O as affected by various environmental factors or management practices. The sensitivity test showed that the GWPs of CH4 and N2O varied significantly with the changes of environmental factors such as the mean annual air temperature, soil bulk density, soil organic carbon, soil texture, and soil pH. Farming managements such as N fertilization, straw returning, and duration of mid-season drainage also had significant effects on the GWPs of CH4 and N2O. Therefore, the above-mentioned environmental factors and farming managements should be taken into account to estimate the greenhouse gases emission from the rice-wheat cropping system on site-specific or regional scale.

Ma Z.,Henan Agricultural University | Qin Y.,Hebi Academy of Agricultural science | Wang Y.,Henan Agricultural University | Zhao X.,Henan Agricultural University | And 3 more authors.
PLoS ONE | Year: 2015

A long period of silk viability is critical for a good seed setting rate in maize (Zea mays L.), especially for inbred lines and hybrids with a long interval between anthesis and silking. To explore the molecular mechanism of silk viability and its heterosis, three inbred lines with different silk viability characteristics (Xun928, Lx9801, and Zong3) and their two hybrids (Xun928xZong3 and Lx9801xZong3) were analyzed at different developmental stages by a proteomic method. The differentially accumulated proteins were identified by mass spectrometry and classified into metabolism, protein biosynthesis and folding, signal transduction and hormone homeostasis, stress and defense responses, and cellular processes. Proteins involved in nutrient (methionine) and energy (ATP) supply, which support the pollen tube growth in the silk, were important for silk viability and its heterosis. The additive and dominant effects at a single locus, as well as complex epistatic interactions at two or more loci in metabolic pathways, were the primary contributors for mid-parent heterosis of silk viability. Additionally, the proteins involved in the metabolism of anthocyanins, which indirectly negatively regulate local hormone accumulation, were also important for the mid-parent heterosis of silk viability. These results also might imply the developmental dependence of heterosis, because many of the differentially accumulated proteins made distinct contributions to the heterosis of silk viability at specific developmental stages. © 2015 Ma et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Wang X.,Henan Agricultural University | Wang X.,Hebi Academy of Agricultural science | Chang J.,Hebi Academy of Agricultural science | Qin G.,Hebi Academy of Agricultural science | And 3 more authors.
African Journal of Agricultural Research | Year: 2011

Xundan 20 was released by Hebi Academy of Agricultural Sciences in 2003. The stability, adaptation and yield components of Xundan 20 were analyzed using data from Huanghuaihai national tests in 2001 and 2002 and from high yield trials from 2005 to 2010. The results showed that variety Xundan 20 yielded most and increased significantly than Nongda 108 (Control, CK) in Huanghuaihai national tests in 2001 and 2002. The yield potential of variety Xundan 20 was so high that it created a series of new record in China. The yield of variety Xundan 20 of 15971.7 kg/ha created the highest record of summer maize in China in 2007, with the yield components of 77835 plant/ha, 205.2 g/ear, 596.16 grains/ear and 350 g per 1000-grain. The variation coefficient of variety Xundan 20 was small and its yield was stable. It is based on excellent comprehensive resistance of variety Xundan 20 to main disasters in Huanghuaihai region such as diseases, pests and lodging, © 2011 Academic Journals.

Discover hidden collaborations