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Differential response of radial growth and δ^(13)C in Qinghai spruce(Picea crassifolia) to climate change on the southern and northern slopes of the Qilian Mountains in Northwest China
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作者 Li Qin Huaming Shang +4 位作者 Weiping Liu Yuting Fan Kexiang Liu Tongwen zhang ruibo zhang 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第3期205-218,共14页
Tree radial growth can have significantly differ-ent responses to climate change depending on the environ-ment.To elucidate the effects of climate on radial growth and stable carbon isotope(δ^(13)C)fractionation of Q... Tree radial growth can have significantly differ-ent responses to climate change depending on the environ-ment.To elucidate the effects of climate on radial growth and stable carbon isotope(δ^(13)C)fractionation of Qing-hai spruce(Picea crassifolia),a widely distributed native conifer in northwestern China in different environments,we developed chronologies for tree-ring widths and δ^(13)C in trees on the southern and northern slopes of the Qilian Mountains,and analysed the relationship between these tree-ring variables and major climatic factors.Tree-ring widths were strongly influenced by climatic factors early in the growing season,and the radial growth in trees on the northern slopes was more sensitive to climate than in trees on the southern.Tree-ring δ^(13)C was more sensitive to climate than radial growth.δ^(13)C fractionation was mainly influenced by summer temperature and precipitation early in the growing season.Stomatal conductance more strongly limited stable carbon isotope fractionation in tree rings than photosynthetic rate did.The response between tree rings and climate in mountains gradually weakened as climate warmed.Changes in radial growth and stable carbon isotope fractionation of P.crassifolia in response to climate in the Qilian Mountains may be further complicated by continued climate change. 展开更多
关键词 Tree rings Qinghai spruce(Picea crassifolia Kom.) Stable carbon isotope(δ^(13)C) Qilian Mountains:Climate change
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Effect of kinetic ions on the toroidal double-tearing modes
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作者 张睿博 叶磊 +2 位作者 Yang Chen 项农 杨小庆 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第2期366-371,共6页
We investigate the effects of kinetic ions on double-tearing modes(DTMs) using the gyrokinetic particle-in-cell simulation code GEM with a gyrokinetic ion/fluid electron hybrid model. It is found that the ion kinetic ... We investigate the effects of kinetic ions on double-tearing modes(DTMs) using the gyrokinetic particle-in-cell simulation code GEM with a gyrokinetic ion/fluid electron hybrid model. It is found that the ion kinetic effects can decrease the growth rate of the DTMs. This effect is more significant for stronger coupling of DTMs with smaller distance between the rational surfaces. Kinetic ions can also enhance the coupling effect between the two rational surfaces. Energy transfer analyses between particles and wave fields show that the stabilizing effect of kinetic ions comes mainly from the perpendicular magnetic drift of ions in the coupling region and around the outer rational surface. 展开更多
关键词 double-tearing modes kinetic ions coupling effect
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Influence of stationary driven helical current on the m=2/n=1 resistive tearing mode
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作者 袁赟 路兴强 +4 位作者 董家齐 何志雄 张睿博 陈诗佳 龚学余 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第5期73-78,共6页
The influence of stationary driven helical current on tearing mode instability in the m=2/n=1 rational surface is explored numerically using resistive magnetohydrodynamic simulation in cylindrical geometry.The results... The influence of stationary driven helical current on tearing mode instability in the m=2/n=1 rational surface is explored numerically using resistive magnetohydrodynamic simulation in cylindrical geometry.The results indicate that the flip instabilities result from the sustained injection of the sufficiently strong helical current driven in the island O-point.The driven helical current induces high order harmonics of instabilities due to the delay of suppressing timing and the increase of its current intensity.With the appropriate current density values,the development of the perturbed kinetic energy can be limited and the occurrence of the flip instabilities can be delayed for a long time.The radial deviation of the current deposition can lead to poor inhibition effect,and the effect of current bias on the boundary is greater than that on the axis. 展开更多
关键词 TEARING MODES HELICAL CURRENT MHD INSTABILITY
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Climatic response of Pinus sylvestris var. mongolica tree-ring width and precipitation reconstruction for the northern Greater Higgnan Mountains, China, since 1720
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作者 TongWen zhang YuJiang Yuan +6 位作者 WenShou Wei ruibo zhang ShuLong Yu Feng Chen HuaMing Shang Li Qin ZiAng Fan 《Research in Cold and Arid Regions》 CSCD 2014年第6期546-555,共10页
August-June precipitation has been reconstructed back to AD 1720 for the northern Greater Higgnan Mountains, China, by use ofPinus sylvestris var. mongolica tree-ring width. The reconstruction explains the variance of... August-June precipitation has been reconstructed back to AD 1720 for the northern Greater Higgnan Mountains, China, by use ofPinus sylvestris var. mongolica tree-ring width. The reconstruction explains the variance of 39% in observed precipitation from 1973 to 2008. Some extremely dry/wet signals in historical documents and other precipitation reconstructions in previous studies are precisely captured in our reconstruction. Wet periods occurred during the periods of 1730 to 1746, 1789 to 1812, 1844 to 1903, 1920 to 1930, 1942 to 1961, and 1985 to 1998; while periods of 1747 to 1788, 1813 to 1843, 1904 to 1919, 1931 to 1941, and 1962 to 1984 were relatively dry. Power spectral and wavelet analyses demon- strated the existence of significant 24-year, 12-year, and 2-year cycles of variability. 展开更多
关键词 Greater Higgnan Mountains Pinus sylvestris var. mongolica tree-ring width precipitation reconstruction
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