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Temperature variations recovered from tree-rings in the middle Qilian Mountain over the last millennium

Science china Earth {1. 2005年第4期48卷 521-529页

作者： liu xiaohong1,2, qin dahe1, shao xuemei , {3. tuo1 & ren jiawen12 1. cold and arid regions environmental and Engineering research institute,{13., lanzhou 73.000, china 2. institute of Geographical sciences and Natural Resources research,{13., Beijing 100101, china 1. cold and {1. {3. environmental and Engineering research institute Chinese Academy of Sciences 730000 Lanzhou China 2. institute of Geographical {1. and Natural Resources research Chinese Academy of Sciences 100101 Beijing China

Based on the cross-dated tree-ring samples collected from the middle Qilian Moun- tain, a standard ring-width chronology had been developed, which covered the period AD 1.00 to 2000. The correlations between the chronology and climatic records from the nearby meteorological stations indicated that temperature was the dominant climatic factor for tree growth at upper timberline, and the most important climatic factor for the tree growth in the area was the mean temperature from previous December to current April. The temperature variations recovered from the ring-width data showed a {1. period during the “Little Ice Age” and the con- tinuous warming during the twentieth century. Comparison between the ring-width chronology and δ1.O records from the Dunde ice core in the Qilian Mountain indicated that there was a con- sistent trend in both time series. A significant correlation existed between our ring-width chro- nology and the Northern Hemispheric temperature, suggesting that the climate changes in the Qilian Mountain were not only driven by regional factors, but also responsive to the global cli- mate.

关键词： middle Qilian Mountain, tree-ring width chronology, temperature variations.

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Climatic significance of stable carbon isotope in tree rings of Abies spectabibis in southeastern Tibet

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chinese Science Bulletin 2003年第18期48卷 2000-2004页

作者： liu {1. qin {3. shao xuemei chen tuo ren jiawen cold and {1. regions Environment and Engineering {3. institute Chinese Academy of SciencesLanzhou 730000China institute of Geographic {1. and Nature Resources research Chinese Academy of SciencesBeijing 100101China

The annually cross-dated stable carbon isotope of tree-ring a-cellulose of Abies spectabibis collected from the southeastern Tibetan Plateau is used to examine its rela-tionship with climatic parameters. The residual D1.C series in treerings is constructed after removing the effects of age trend and rising CO2. We found a close relationship between D1.C in tree rings and the relative humidity of September—November of the previous year measured at the nearby Ny-ingchi Meteorological Station, albeit a strong 搇agged effect? Thus we developed a transfer function to reconstruct the autumn relative humidity for the Nyingchi region, which explained 3..9% of the total variance (p 1.. Our results suggest a high frequency and moderate amplitude variance of the relative humidity before 1.00, and the variance re-versed afterwards.

关键词： Abies spectabibis tree rings stable carbon isotope cli-matic reconstruction.

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Climatic significance of the stable carbon isotope composition of tree-ring cellulose:Comparison of chinese hemlock (Tsuga chinensis Pritz) and alpine pine (Pinus densata Mast) in a temperate-moist region of{1.

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Science china Earth {1. 2007年第7期50卷 1076-1085页

作者： liu {1. shao {3. WANG LiLi ZHAO LiangJu WU Pu chen tuo qin dahe ren jiawen Key Laboratory of Cryosphere and Environment Cold and Arid Regions Environmental and Engineering Research InstituteChi-nese Academy of SciencesLanzhou 730000China institute of Geographical {1. and Natural Resources research Chinese Academy of SciencesBeijing 100101China institute of Tibetan Plateau {1. Chinese Academy of SciencesBeijing 100085China 4 Laboratory of Watershed Hydrology and EcologyCold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China

In the reconstruction of past climate using stable carbon isotope composition (δ1.C) in tree ring,the responses of the stable carbon composition (δ1.C) of multiple tree species to environmental factors must be known detailedly. This study presented two δ1.C series in annual tree rings for {1. hem-lock (Tsuga chinensis Pritz) and alpine pine (Pinus densata Mast),and investigated the relationships between climatic parameters and stable carbon discrimination (△1.C) series,and evaluated the poten-tial of climatic reconstruction using △1.C in both species,in a temperate-moist region of Chuanxi Pla-teau,china. The raw δ1.C series of the two species was inconsistent,which may be a result of different responses caused by tree's inherent physiological differences. After removing the low-frequency ef-fects of CO2 concentration,the high-frequency (year-to-year) inter-series correlation of △1.C was strong,indicating that △1.C of the two tree species were controlled by common environmental conditions. The △1.C series of the species were most significantly correlated with temperature and moisture stress,but in different periods and intensity between the species. During the physiological year,the impacts of temperature and moisture stress on △1.C occur earlier for {1. hemlock (previous December to February for moisture stress and February to April for temperature,respectively) than for alpine pine (March to May for moisture stress and April to July for temperature,respectively). In addition,in temperate-moist regions,the control on △1.C of single climatic parameter was not strongly dominant and the op-timal multiple regressions functions just explained the 3..5% variance of the total. Therefore,there is limited potential for using δ1.C alone to identify clear,reliable climatic signals from two species.

关键词： temperate-moist region chinese hemlock Alpine pine inter-specific δ1.C variability climatic significance

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