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  • 1
    Online Resource
    Online Resource
    Generation of Continental Alkalic Mafic Melts by Tholeiitic Melt–Mush Reactions: a New Perspective from Contrasting Mafic Cumulates and Dikes in Central Tibet
    Oxford University Press (OUP) ; 2022
    In:  Journal of Petrology Vol. 63, No. 5 ( 2022-05-01)
    Details
    In: Journal of Petrology, Oxford University Press (OUP), Vol. 63, No. 5 ( 2022-05-01)
    Abstract: Alkalic basalts from continental regions have been widely used to fingerprint chemically and lithologically distinct components in the mantle. However, superimposed on mantle source effects are the effects of intra-crustal magma differentiation, which may be underestimated when exclusively considering fractional crystallization (FC) in melt-rich magma chambers. Here we present extensive mineralogical and geochemical data for mafic cumulates and dolerite dikes from central Tibet to demonstrate that tholeiitic magma differentiation occurred in crystal-rich mushes and melt-filled fractures. The mafic cumulates provide a snapshot of the percolation of water-poor ( & lt;0.9 wt% H2O), oxide-undersaturated, tholeiitic melts through slightly hotter mushes (50–60% crystals) with a framework of primitive olivine ± plagioclase crystals. The highly corroded olivines indicate that thermo-chemical disequilibrium between the later percolating melts and pre-existing crystal framework triggered melt–mush reactions in an open system. High-temperature ( & gt;1060°C) reactions were accompanied by a decreasing melt mass, causing the initial tholeiitic melts to evolve into alkalic mafic melts during slow cooling. This process involved the dissolution and reprecipitation of olivine, plagioclase, and clinopyroxene as well as the late crystallization of high-TiO2 (up to 3.4 wt%) clinopyroxene and kaersutite. In contrast, the same tholeiitic magmas (i.e. dolerite dikes) that intruded the cold country rocks along fractures produced silica-rich residual melts saturated in Fe–Ti oxides and sodic plagioclase by FC during rapid cooling. The residual melt was always in equilibrium with the instantaneous crystal during closed-system FC, so there was no reaction between the interstitial melt and adjacent crystal even after a high degree of crystallization. Alkalic mafic melts that can be formed by melt–mush reactions exhibit strong enrichment of incompatible element contents (e.g. Ti and alkali and rare earth elements) and ratios (e.g. Ce/Y), but little Si enrichment and Mg depletion, compared with the parental tholeiitic magma, which cannot be reproduced by simple FC. We argue that tholeiitic melt–mush reactions at mid- to lower-crustal pressures (≥0.5 GPa) are a new mechanism for the generation of interstitial alkalic mafic melts in continental mush reservoirs. Continental alkalic basalts could be produced by this mechanism if such interstitial melts were concentrated into melt lenses by compaction and then transported rapidly upward to the surface by focused flow.
    Type of Medium: Online Resource
    ISSN: 0022-3530 , 1460-2415
    URL: Article
    DOI: 10.1093/petrology/egac039
    RVK:
    RB 10121
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2022
    detail.hit.zdb_id: 1466724-1
    SSG: 13
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  • 2
    Online Resource
    Online Resource
    Global marine redox evolution from the late Neoproterozoic to the early Paleozoic constrained by the integration of Mo and U isotope records
    Elsevier BV ; 2021
    In:  Earth-Science Reviews Vol. 214 ( 2021-03), p. 103506-
    Details
    In: Earth-Science Reviews, Elsevier BV, Vol. 214 ( 2021-03), p. 103506-
    Type of Medium: Online Resource
    ISSN: 0012-8252
    URL: Article
    DOI: 10.1016/j.earscirev.2021.103506
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1792-9
    detail.hit.zdb_id: 2012642-6
    SSG: 13
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  • 3
    Online Resource
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    An Approximate Explicit Green–Ampt Infiltration Model for Cumulative Infiltration
    Wiley ; 2018
    In:  Soil Science Society of America Journal Vol. 82, No. 4 ( 2018-07), p. 919-930
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 82, No. 4 ( 2018-07), p. 919-930
    Abstract: Core Ideas Proposed an explicit Green–Ampt model (EGA model) to estimate cumulative 1D vertical infiltration. The form of error term & epsi; is determined as a power‐function through non‐dimensional numerical analysis. The EGA model is reliable for estimation the cumulative infiltration for a variety of soil textures. Accurately estimating soil moisture infiltration information contributes to scientific understanding of the one‐dimensional (1D) vertical infiltration process. Because of its simple form, the Green–Ampt (GA) model has been extensively employed to simulate soil infiltration processes. However, the GA model is an implicit solution that must be solved through iterative techniques, and thus is inconvenient. Therefore, based on the two‐parameter infiltration equation proposed by Valiantzas, by adding an error term and non‐dimensional numerical analysis, this study proposes an approximate explicit Green–Ampt model (EGA model) for estimating cumulative infiltration with a determined power function expression for the error term. A total of 12 typical soils were selected from the USDA soil textural classes, and the 1D vertical soil infiltration process was simulated using Hydrus‐1D. The reliability of the proposed EGA model was verified using measured and simulated values. The mean absolute percentage relative error (MAPRE) and percentage of bias (PB) were taken as evaluation indicators to compare the estimated cumulative infiltration with the measured and simulated values. The results revealed that all cumulative infiltration values estimated by the EGA model are in good agreement with those measured in laboratory experiments and simulated using Hydrus‐1D; the mean MAPRE and PB values of all treatments were 4.2 and 0.7%, respectively. In addition, the estimated errors of the EGA model were consistent with those of the GA model. Hence, the EGA model can estimate the cumulative infiltration in 1D vertical soil infiltration with high accuracy and is suitable for a variety of soil textures.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2017.11.0404
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2018
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    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
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  • 4
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    Effects of sodium hydrosulfide and rhizobia on the growth rate, nutrient stoichiometry, and nutrient resorption of soybean ( Glycine max L.) #
    Wiley ; 2022
    In:  Journal of Plant Nutrition and Soil Science Vol. 185, No. 1 ( 2022-02), p. 69-86
    Details
    In: Journal of Plant Nutrition and Soil Science, Wiley, Vol. 185, No. 1 ( 2022-02), p. 69-86
    Abstract: NaHS, a donor of hydrogen sulfide (H 2 S), which is emerging as a potential signaling molecule, may regulate various physiological processes in plants. However, how soybean ( Glycine max L.) responds to NaHS and rhizobia ( Sinorhizobium fredii ) inoculation remains unclear. Methods We explored the effects of NaHS and rhizobia on the growth rate, nodules, nitrogenase activities (NA), chlorophyll content, soluble protein content, photosynthesis (Pn), chlorophyll fluorescent parameters, endogenous H 2 S accumulation, l / d ‐cysteine desulfhydrase ( GmLCD and GmDCD ) gene expression, nitrogen (N), phosphorus (P), potassium (K) contents, and nutrient resorption. Results The results showed that rhizobia significantly increased the shoot, root, total dry weight, and growth rate, and NaHS promoted nodule numbers and NA in soybean. Moreover, chlorophyll content, soluble protein content, Pn, endogenous H 2 S accumulation, and GmLCD and GmDCD gene expression levels were promoted by NaHS and rhizobia. In addition, during all growth stages of soybean, the levels of N, P, and K and the N:P ratio in different tissues were affected by NaHS and rhizobia. Additionally, NaHS and rhizobia also significantly enhanced N resorption efficiency (NRE) and K resorption efficiency (KRE), but decreased P resorption efficiency (PRE). Conclusion Therefore, NaHS and rhizobia regulated the growth rate, nutrient stoichiometry, and nutrient resorption efficiency of soybean. These findings provide information that will be useful for predicting how NaHS and rhizobia lead to variations in nutrient uptake and nutrient conservation strategies.
    Type of Medium: Online Resource
    ISSN: 1436-8730 , 1522-2624
    URL: Issue
    URL: Article
    DOI: 10.1002/jpln.v185.1
    DOI: 10.1002/jpln.202100121
    RVK:
    RA 5430
    Language: English
    Publisher: Wiley
    Publication Date: 2022
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    detail.hit.zdb_id: 1470765-2
    detail.hit.zdb_id: 200063-5
    SSG: 12
    SSG: 13
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  • 5
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    Spatiotemporal evolution of late Neoproterozoic marine environments on the Yangtze Platform (South China): inking continental weathering and marine C-P cycles
    Elsevier BV ; 2022
    In:  Global and Planetary Change Vol. 216 ( 2022-09), p. 103927-
    Details
    In: Global and Planetary Change, Elsevier BV, Vol. 216 ( 2022-09), p. 103927-
    Type of Medium: Online Resource
    ISSN: 0921-8181
    URL: Article
    DOI: 10.1016/j.gloplacha.2022.103927
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 20361-0
    detail.hit.zdb_id: 2016967-X
    SSG: 13
    SSG: 14
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  • 6
    Online Resource
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    Aging mechanism of copper added to bentonite
    Elsevier BV ; 2008
    In:  Geoderma Vol. 147, No. 1-2 ( 2008-9), p. 86-92
    Details
    In: Geoderma, Elsevier BV, Vol. 147, No. 1-2 ( 2008-9), p. 86-92
    Type of Medium: Online Resource
    ISSN: 0016-7061
    URL: Article
    DOI: 10.1016/j.geoderma.2008.08.003
    RVK:
    RA 2235.4
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2008
    detail.hit.zdb_id: 281080-3
    detail.hit.zdb_id: 2001729-7
    SSG: 13
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  • 7
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    How much yield loss has been caused by extreme temperature stress to the irrigated rice production in China?
    Springer Science and Business Media LLC ; 2016
    In:  Climatic Change Vol. 134, No. 4 ( 2016-2), p. 635-650
    Details
    In: Climatic Change, Springer Science and Business Media LLC, Vol. 134, No. 4 ( 2016-2), p. 635-650
    Type of Medium: Online Resource
    ISSN: 0165-0009 , 1573-1480
    URL: Article
    DOI: 10.1007/s10584-015-1545-5
    RVK:
    RA 1000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2016
    detail.hit.zdb_id: 751086-X
    detail.hit.zdb_id: 1477652-2
    SSG: 14
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  • 8
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    The impact of teleconnections on the temporal dynamics in aboveground net primary productivity of the Mongolian Plateau grasslands
    Wiley ; 2021
    In:  International Journal of Climatology Vol. 41, No. 15 ( 2021-12), p. 6541-6555
    Details
    In: International Journal of Climatology, Wiley, Vol. 41, No. 15 ( 2021-12), p. 6541-6555
    Abstract: Temporal dynamics in aboveground net primary productivity (ANPP) are significant for environmental protection and economic development in the Mongolian Plateau grasslands (MPGs). Climate control of ANPP's temporal variations has intensified in response to local meteorological conditions, while the contributions of large‐scale atmospheric circulations to ANPP variations are poorly understood in the MPGs. First, we explored the temporal dynamics in annual ANPP, and then, we analyzed correlations among annual ANPP, local meteorological variables, and three different teleconnections during 1982–2015 in this study. Our analytical results indicated that (a) ANPP exhibited an increasing trend during the entire study period. However, the increasing trend did not persist, and two reversals occurred in 1998 and 2007. (b) ANPP variations were primarily influenced by summer precipitation in most regions and by summer precipitation and temperature together in other regions of the MPGs. (c) The Atlantic Multidecadal Oscillation (AMO) in winter negatively dominated annual ANPP variations by influencing summer precipitation and summer temperature in central Mongolia. The North Atlantic Oscillation (NAO) in winter exerted strong positive impacts on ANPP variations by influencing summer precipitation in Inner Mongolia, China. The East Atlantic Western Russia (EAWR) in spring controlled annual ANPP variations by influencing summer precipitation in western and eastern Mongolia. (d) The winter AMO, winter NAO and spring EAWR significantly dominated the annual ANPP variations in 49.78% of the MPGs, with values of 18.90, 9.81 and 21.07%, respectively. (e) Reversals of the winter AMO, winter NAO and spring EAWR between negative and positive phases resulted in two reversals of ANPP trends. This study will improve our understanding of the role of large‐scale atmospheric circulations in regulating ANPP variations and will be valuable in guiding the development of grazing land management in Mongolia and Inner Mongolia, China.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    DOI: 10.1002/joc.v41.15
    DOI: 10.1002/joc.7211
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491204-1
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  • 9
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    Long-term returning agricultural residues increases soil microbe-nematode network complexity and ecosystem multifunctionality
    Elsevier BV ; 2023
    In:  Geoderma Vol. 430 ( 2023-02), p. 116340-
    Details
    In: Geoderma, Elsevier BV, Vol. 430 ( 2023-02), p. 116340-
    Type of Medium: Online Resource
    ISSN: 0016-7061
    URL: Article
    DOI: 10.1016/j.geoderma.2023.116340
    RVK:
    RA 2235.4
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 281080-3
    detail.hit.zdb_id: 2001729-7
    SSG: 13
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  • 10
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    Using coprophilous fungi to reconstruct the history of pastoralism in the Qinghai Lake Basin, Northeastern Qinghai-Tibetan Plateau
    SAGE Publications ; 2020
    In:  Progress in Physical Geography: Earth and Environment Vol. 44, No. 1 ( 2020-02), p. 70-93
    Details
    In: Progress in Physical Geography: Earth and Environment, SAGE Publications, Vol. 44, No. 1 ( 2020-02), p. 70-93
    Abstract: The history of permanent human settlement in the high-altitude regions ( 〉 3000 m above sea level [masl]) of the Qinghai-Tibetan Plateau (QTP) is important in understanding human adaptation to this cold “Third Pole” region. The Qinghai Lake Basin was an important corridor used by prehistoric humans migrating to the inner QTP. Pastoralism is currently the most important means of sustaining permanent human settlement in the high-altitude regions of the QTP. However, the lack of reliable proxy measures reflecting prehistoric pastoral activities impedes our understanding of how pastoralism developed. The identification of coprophilous fungi in prehistoric cultural deposits may help refine the history of pastoralism. We collected 21 modern domesticated herbivore dung samples and 66 surface soil samples from the Qinghai Lake Basin for fungal spore analyses. We then evaluated how useful such analyses are for identifying grazing activities. Fifty-three samples were also collected from the JXG2 stratigraphic profile (∼10.0–0 ka; 3312 masl) for fungal spore analysis. Results indicate that low and stable values of the total concentration of coprophilous fungi were present from ∼10.0 to ∼5.5 ka. Concentrations gradually increased from ∼5.5 to ∼4.2 ka, significantly increased from ∼4.2 to ∼2.6 ka, and then increased dramatically after ∼2.6 ka. By combining these results with charcoal concentrations ( 〉 50 µm), lithic artifacts, bones and potsherds recovered from the JXG2 site, we infer that early pastoralism in Qinghai Lake Basin appeared between ∼6.0 to ∼5.5 ka and gradually intensified throughout the remainder of the Holocene as herding and farming gradually replaced hunting–gathering as the primary subsistence strategies. These results are supported by pollen records, archeological remains and historical records in the northeastern QTP.
    Type of Medium: Online Resource
    ISSN: 0309-1333 , 1477-0296
    URL: Article
    DOI: 10.1177/0309133319869596
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2006623-5
    SSG: 14
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