3,066 research outputs found
Data for Wang and Wen, Chinese Science Bulletin, 2007
No full textThis dataset include the reconstructed 10-yr averaged surface air temperature in 1000AD~2000AD for 10 regions in China. The 10 regions are 1) Northeast, 2) North, 3) East, 4) South, 5) Taiwan, 6) Center, 7) Southwest, 8) Northwest, 9) Xinjiang, and 10) Tibet.
Please note that the area weights for each region are: 0.131, 0.084, 0.043, 0.059, 0.011, 0.072, 0.071, 0.198, 0.149, 0.182. They are used in computing the eastern/western/whole China averages to avoid underestimate the contributions from the west
Data for Wang and Wen, Chinese Science Bulletin, 2007
No full textThis dataset include the reconstructed 10-yr averaged surface air temperature in 1000AD~2000AD for 10 regions in China. The 10 regions are 1) Northeast, 2) North, 3) East, 4) South, 5) Taiwan, 6) Center, 7) Southwest, 8) Northwest, 9) Xinjiang, and 10) Tibet.
Please note that the area weights for each region are: 0.131, 0.084, 0.043, 0.059, 0.011, 0.072, 0.071, 0.198, 0.149, 0.182. They are used in computing the eastern/western/whole China averages to avoid underestimate the contributions from the west
Botanical composition (% of DM) (mean ± SE) of different functional groups in three mixtures of 1- to 4-yr-old grasslands.
No full textBotanical composition (% of DM) (mean ± SE) of different functional groups in three mixtures of 1- to 4-yr-old grasslands.</p
Botanical composition (% of DM) (mean ± SE) of different functional groups in three mixtures under cutting and grazing management of 1- to 3-yr-old grasslands.
No full textBotanical composition (% of DM) (mean ± SE) of different functional groups in three mixtures under cutting and grazing management of 1- to 3-yr-old grasslands.</p
Seabed foraging by Antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron
No full textA compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20% of the population reside at depths between 200 and 2000 m, and that large aggregations can form above the seabed. Local differences in the vertical distribution of krill indicate that reduced feeding success in surface waters, either due to predator encounter or food shortage, might initiate such deep migrations and results in benthic feeding. Fatty acid and microscopic analyses of stomach content confirm two different foraging habitats for Antarctic krill: the upper ocean, where fresh phytoplankton is the main food source, and deeper water or the seabed, where detritus and copepods are consumed. Krill caught in upper waters retain signals of benthic feeding, suggesting frequent and dynamic exchange between surface and seabed. Krill contained up to 260 nmol iron per stomach when returning from seabed feeding. About 5% of this iron is labile, i.e., potentially available to phytoplankton. Due to their large biomass, frequent benthic feeding, and acidic digestion of particulate iron, krill might facilitate an input of new iron to Southern Ocean surface waters. Deep migrations and foraging at the seabed are significant parts of krill ecology, and the vertical fluxes involved in this behavior are important for the coupling of benthic and pelagic food webs and their elemental repositories
Annual yield (mean ± SE) of mixtures with increasing species diversity with and without slurry application of 1- to 4-yr-old grasslands.
No full textAnnual yield (mean ± SE) of mixtures with increasing species diversity with and without slurry application of 1- to 4-yr-old grasslands.</p
Yield (mean ± SE) per cut of mixtures with increasing species diversity under cutting and grazing management of 1- to 3-yr-old grasslands.
No full textYield (mean ± SE) per cut of mixtures with increasing species diversity under cutting and grazing management of 1- to 3-yr-old grasslands.</p
Evaluating the contribution of Yr genes to stripe rust resistance breeding through marker-assisted detection in wheat
No full textNumerous stripe rust resistance genes have been identified from wheat, and new virulent races of Puccinia striiformis f. sp. tritici have also emerged in recent years. Deployment of diverse combinations of resistance genes is an efficient way to combat virulent evolution of strip rust pathogen. In this study, publically available molecular markers were used to identify the distribution of 36 Yr genes in 672 wheat accessions. The effectiveness of Yr genes individually and in combinations was also evaluated in field conditions. The result showed effective resistance of some recently applied genes, such as Yr15 and Yr65. It also showed the lost efficacy of some once widely used genes, such as Yr9 and Yr10. Moreover, significant additive effects were observed in some gene combinations, such as Yr9 + Yr18 and Yr30 + Yr46. Proper deploying of Yr genes and utilizing the positive interactions will be helpful for durable resistance breeding in wheat
Holocene variations in the Scottish marine radiocarbon reservoir effect
Full text linkWe assessed the evidence for variations in the marine radiocarbon reservoir effect (MRE) at coastal, archaeological Iron Age sites in north and west Scotland by comparing AMS measurements of paired marine and terrestrial materials (4 pairs per context). DeltaR values were calculated from measurements on material from 3 sites using 6 sets of samples, all of which were deposited around 2000 BP. The weighted mean of the DeltaR determinations was -79 +/- 17 C-14 yr, which indicates a consistent, reduced offset between atmospheric and surface ocean C-14 specific activity for these sites during this period, relative to the present day (DeltaR = similar to0 C-14 yr). We discuss the significance of this revised AR correction by using the example of wheelhouse chronologies at Hornish Point and their development in relation to brochs. In addition, we assess the importance of using the concepts of MRE correction and AR variations when constructing chronologies using C-14 measurements made on materials that contain marine- derived carbon
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