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| 1 | Relative humidity reconstruction for northwestern China's Altay Mountains using tree-ring δ^(18)O显示文摘Relative humidity is an important factor in water and water vapor feedback cycles.In this study,we established a 222-year annual tree-ring δ^(18)O chronology for Siberian larch(Larix sibirica Ldb.)from the Altay Mountains in northwestern China.Climate response analyses revealed that the relative humidity was the primary factor limiting tree-ring δ^(18)O fractionation.Based on our analysis,tree-ring δ^(18)O can be used to reconstruct the July–August relative humidity based on both a reasonable mechanism of tree-ring δ^(18)O fractionation and a statistically significant regression model.We used this model to reconstruct variations in the July–August relative humidity,and the model explained 47.4% of the total variation in the measured relative humidity data from 1961 to 2011.The relative humidity in the study area increased from 1900 to the 1990s and decreased thereafter.Two regime-shift dry periods were detected during the study period(one from 1817 to 1830 and the other from 2004 to 2011). | Guobao Xu Xiaohong Liu Dahe Qin Tuo Chen Wenzhi Wang Guoju Wu Weizhen Sun Wenling An Xiaomin Zeng | 2014 | Chinese Science Bulletin2014，59，2： | 14 |
| 2 | 树轮稳定同位素记录:进展、问题及展望显示文摘树轮稳定同位素比率(δ^13C、δ^18O和δD)变化与树木生长季的气候和环境条件密切相关.控制实验表明,树轮稳定同位素比率变化可较好地记录树木叶片气孔活动、水分来源、水分利用效率等相关信息,已成为古气候和全球变化生态学研究的重要代用指标和手段之一.树轮稳定同位素记录能够较好地保留低频气候环境变化信息,与年轮宽度相结合,可有效地进行区域古气候重建和全球变化生态学方面的研究.文章综述了树轮稳定同位素的分馏机理及其发展,系统阐述和评价了利用树轮稳定同位素指标进行古气候和古环境的相关研究成果,并指出树轮稳定同位素研究在中国未来亟须着重发展的方向. | 刘晓宏 徐国保 王文志 吴国菊 曾小敏 安文玲 张轩文 | 2015 | 第四纪研究2015，35，5： | 10 |
| 3 | 过去2000年中国气候重建与极端事件研究最新进展(英文)显示文摘China is distinguished by a prominent monsoonal climate in the east of the country, a continental arid climate in the northwest and a highland cold climate on the Qinghai-Tibet Plateau. Because of the long history of Chinese civilization, there are abundant and well-dated documentary records for climate variation over the whole of the country as well as many natural archives(e.g., tree-rings, ice cores, stalagmites, varved lake sediments and corals) that enable high-resolution paleoclimatic reconstruction. In this paper, we review recent advances in the reconstruction of climate and extreme events over the last 2000 years in China. In the last 10 years, many new reconstructions, based on multi-proxies with wide spatial coverage, have been published in China. These reconstructions enable us to understand the characteristics of climate change across the country as well as the uncertainties of regional reconstructions. Synthesized reconstructed temperature results show that warm intervals over the last 2000 years occurred in AD 1–200, AD 551–760, AD 951–1320, and after AD 1921, and also show that cold intervals were in AD 201–350, AD 441–530, AD 781–950, and AD 1321–1920. Extreme cold winters, seen between 1500 and 1900, were more frequent than those after 1950. The intensity of regional heat waves, in the context of recent global warming, may not in fact exceed natural climate variability seen over the last 2000 years. In the eastern monsoonal region of China, decadal, multi-decadal and centennial oscillations are seen in rainfall variability. While the ensemble mean for drought/flood spatial patterns across all cold periods shows a meridional distribution, there is a tri-pole pattern with respect to droughts south of 25°N, floods between 25° and 30°N, and droughts north of 30°N for all warm periods. Data show that extreme drought events were most frequent in the periods AD 301–400, AD 751–800, AD 1051–1150, AD 1501–1550, and AD 1601–1650, while extreme flood events were frequent in the periods AD 101–150, AD 251–300, AD 951–1000, AD 1701–1750, AD 1801–1850, and AD 1901–1950. Between AD 1551–1600, extreme droughts and flood events occurred frequently. In arid northwest China, climate was characterized by dry conditions in AD 1000–1350, wet conditions in AD 1500–1850, and has tended to be wet over recent decades. On the northeastern Qinghai-Tibet Plateau, centennial-scale oscillations in precipitation have occurred over the last 1000 years, interrupted by several multidecadal-scale severe drought events. Of these, the most severe were in the 1480 s and 1710 s. In southwest China, extreme droughts as severe as those seen in Sichuan and Chongqing in 2006 are known to have occurred during historical times. | 葛全胜 郑景云 郝志新 刘洋 李明启 | 2016 | Journal of Geographical Sciences2016，26，7： | 8 |
| 4 | 中国利用树轮资料重建干湿变化研究进展显示文摘树木年轮资料定年准确、分辨率高、连续性强,已成为研究过去全球变化的重要信息来源之一。中国树轮与干湿变化研究,样点分布广泛,研究树种较多,重建尺度较长。基于树轮宽度、密度和同位素等各种代用指标,在分析树木径向生长对干湿变化响应、重建历史时期干湿变化等方面取得很大进展。一般来说,在干旱半干旱区的低海拔区域,水分条件,尤其是春季、秋季和年湿润状况,是树木径向生长的重要影响因素。森林上限、相对冷湿区域以及亚热带气候区,树木生长与降水的相关性偏弱。在时间尺度上,基于树轮重建的长于1000年甚至超过2000年的干湿变化序列已有多条,主要分布在青藏高原地区。目前最长年表已达4500年,最长降水序列为3500年。本文通过对部分树轮成果的简要概括,以期为树轮采样和干湿变化重建提供借鉴与帮助。 | 王亚军 李明启 | 2016 | 地理科学进展2016，35，11： | 8 |
| 5 | A 1556 year-long early summer moisture reconstruction for the Hexi Corridor, Northwestern China显示文摘We report a 1556 year-long tree-ring width chronology for the Hexi Corridor, in the arid Northwestern China,established by applying the signal-free regional curve standardization method to 416 juniper ring-width series. We found that drought in early summer(May–June) is the primary controlling factor for tree growth in this area. We then developed an early summer moisture(i.e., scPDSI) reconstruction from 455 CE to present. Our reconstruction captures multi-centennial scale moisture variations, showing two long-term dry periods during 800–950 CE and 1000–1200 CE, and two long-term wet periods during 1200–1450 CE and 1510–1620 CE. We found strong similarities between hydroclimatic changes in the Hexi Corridor and Qaidam Basin from interannual to centennial timescales; however, at multi-centennial(>300 years) timescales, hydroclimatic variations in the two regions showed significant regional differences. The Hexi Corridor witnessed a generally dry Medieval Climate Anomaly(MCA, here 800–1200 CE) and the drying 20 th century, whereas the Qaidam Basin experienced highprecipitation periods during the MCA and 20 th century. The different correlation pattern with Northern Hemisphere temperature suggest that the Qaidam Basin will receive more precipitation under global warming, whereas the Hexi Corridor will become dryer in the future. | Bao YANG Jianglin WANG Jingjing LIU | 2019 | Science China Earth Sciences2019，62，6： | 7 |
| 6 | 树轮记录的黄河源区1505~2013年5~9月相对湿度变化显示文摘根据采集自青海省玛沁县雪山乡的祁连圆柏建立树轮宽度年表。通过相关分析发现,树轮宽度标准化年表(STD)与黄河源区内4个气象站平均5~9月相对湿度存在显著的正相关关系,相关系数达到0.60(建模期为1969~2013年)。利用标准化年表重建了黄河源区过去509年的5~9月平均相对湿度变化序列,重建方程方差解释量达36.0%,且方程稳定可靠。重建序列在过去509年先后经历了6个湿润阶段和8个干旱阶段:湿润阶段为1655~1697年、1746~1793年、1795~1816年、1898~1916年、1933~1957年和1962~1992年;干旱阶段为1530~1541年、1544~1586年、1590~1634年、1728~1745年、1817~1836年、1856~1886年、1917~1932年和1993~2004年。利用多窗谱分析(MTM)表明,重建序列具有85~256a、3.0~3.6a和2.0~2.8a左右的显著周期变化。通过对比发现,此次重建序列与黄河源区附近及青藏高原东北部其他一些能反映干湿状况的树轮重建序列在低频上具有较好的一致性。 | 黄小梅 肖丁木 秦宁生 | 2017 | 第四纪研究2017，37，3： | 6 |
| 7 | 树轮记录的长江源区近412年以来3-5月降水量变化显示文摘利用采自长江源区青海省治多县立新乡夏日寺的大果圆柏建立树轮宽度标准年表。通过与气候要素的分析发现,该地区树木生长主要受干旱限制,树轮年表与3-5月降水量相关较好(r=0.67)。由此重建了长江源区412年以来的3-5月降水量变化,重建方程稳定可靠,方差解释量为44.9%。重建结果显示,重建序列大体经历了10个湿润时期和10个干旱时期,并显示研究区近10年有显著的变湿趋势。采用经验模态分解(EMD)方法对重建序列进行分析,重建降水序列可分解为7个IMF分量,其中,2~4年和6~10年的主要分量表明了降水量与ENSO等海气环流的相关联系,11~28年的分量则显示了区域降水与太阳活动的可能联系。与邻近地区的重建结果对比发现,其变化趋势比较一致。通过时空相关分析,表明重建序列具有较好的时空代表性。此外,重建结果还得到了气象灾害历史记录的验证。 | 肖丁木 秦宁生 黄小梅 | 2016 | 冰川冻土2016，38，6： | 4 |
| 8 | Late Holocene hydroclimatic variations and possible forcing mechanisms over the eastern Central Asia显示文摘Hydroclimatic variations over the eastern Central Asia are highly sensitive to changes in hemispheric-scale atmospheric circulation systems. To fully understand the long-term variability and relationship between hydroclimate and atmospheric circulation system, we present a high-resolution lascustrine record of late Holocene hydroclimate from Lake Sayram, Central Tianshan Mountains, China, based on the total organic carbon, total nitrogen, and carbonate contents, carbon/nitrogen ratios, and grain size. Our results reveal four periods of substantially increased precipitation at the interval of 4000–3780, 3590–3210, 2800–2160, and 890–280 cal yr BP, and one period of slightly increased precipitation from 1700–1370 cal yr BP. These wetter periods broadly coincide with those identified in other records from the mid-latitude Westerlies-dominated eastern Central Asia, including the northern Tibetan Plateau. As such, a similar hydroclimatic pattern existed over this entire region during the late Holocene. Based on a close similarity of our record with reconstruction of North Atlantic Oscillation indices and solar irradiance, we propose that decreased solar irradiance and southern migration of the entire circum-North Atlantic circulation system, particularly the main pathway of the mid-latitude Westerlies, significantly influenced hydroclimate in eastern Central Asia during the late Holocene. Finally, the inferred precipitation at Lake Sayram has increased markedly over the past 100 years, although this potential future changes in hydroclimate in Central Asia need for further investigation. | Jianghu LAN Hai XU Keke YU Enguo SHENG Kangen ZHOU Tianli WANG YuANDa YE Dongna YAN Huixian WU Peng CHENG Waili ABULIEZI Liangcheng TAN | 2019 | Science China Earth Sciences2019，62，8： | 3 |
| 9 | 利用生态学和树轮年代学手段试析柴达木盆地东缘山地森林年龄结构与气候变化的关系显示文摘选取柴达木盆地东缘山地尔日格为研究剖面,对坡面上的祁连圆柏(Sabina przewalskii Kom.)沿不同海拔高度进行采样.在利用交叉定年手段对所有样芯定年之后,确定了样芯的起始年和结束年(死亡年龄),然后利用树髓心年龄估算法和研究区域胸高年龄经验值最终确定了树木活体植株开始生长的年龄(长树年龄).根据研究坡面上树木长树或死树年份随海拔和时间变化的变化规律,探讨了它们与气候变化之间的可能关系,从而用来作为树轮宽度重建的佐证手段之一.结果表明:在森林上部和中部,随海拔的升高,树木的年龄呈递减趋势;在森林下部,随海拔的降低,树木年龄趋于年轻化;整个坡面长树峰值出现在公元1200年左右,长树主要集中在森林中部的3900~4110m之间;树木死亡的峰值出现在公元1600年之后的50年间,死树主要集中在森中上部的4100~4210m之间.同时,还发现在坡面树木死亡较集中的时期,森林树木更新数目较低,尤其是在森林上部;而通过对不同海拔高度上最老树的生长年龄分析,发现在坡面长树比较集中的时期,森林下部有往更低海拔处长树的趋势.将研究坡面长树和死树随时间变化的分布情况与研究区附近利用树轮宽度重建的乌兰过去1000年上年9月到当年4月平均温度和德令哈过去1000年上年7月至当年6月降水量进行对比,发现在40年尺度上,高温对应着树木高生长数目,低温并且降水量由多变寡则对应着树木低生长数目和高死亡数.表明:温度的升高有利于研究坡面祁连圆柏更新的发生,森林密度增大,森林中部幼树更新存活数量最多,森林下部有往更低海拔处长树的趋势,森林上限随海拔的升高密度降低、树木趋于年轻化;反之,气候干冷,树木更新条件变差,受影响的区域主要集中在森林中部-森林林线中上部范围内,死树相对比较集中. | 田华 邵雪梅 尹志勇 张慧 汪洋 陈锋 | 2015 | 第四纪研究2015，35，5： | 2 |
| 10 | 中国西部树木年轮δ^18O的气候信号显示文摘树轮稳定氧同位素比率(δ^18O)记录在区域气候重建方面具有一定优势.树轮δ^18O记录受树木生长趋势的影响较小,保留了丰富的低频信号,对区域气候变化有较一致的响应.通过对比我国西部1901~2004年树轮δ^18O平均值和降水δ^18O空间分布特征发现,两者空间分布存在一定的相似性.在青藏高原南部树轮δ^18O为低值,而青藏高原北部树轮δ^18O为高值.树轮δ^18O平均值随树轮样点纬度的向北偏移而增大.树轮δ^18O与相邻气象站记录响应分析表明,树轮δ^18O和生长季的温度呈显著正相关,与生长季降水和相对湿度呈现显著负相关关系.旋转经验正交函数分析和空间响应分析表明,树轮δ^18O在我国西风影响区的新疆北部主要反映与区域干湿变化相关的气候信号;树轮δ^18O在西南季风影响的藏东南区主要反映区域水文气候变化信息;然而,在季风和西风影响的交汇区域,树轮δ^18O的区域气候信号相对较弱. | 徐国保 刘晓宏 陈拓 安文玲 王文志 吴国菊 曾小敏 王波 | 2015 | 第四纪研究2015，35，5： | 2 |
| 11 | Climate change inferred from aeolian sediments in a lake shore environment in the central Tibetan Plateau during recent centuries显示文摘Studies of the past climate variation on the Tibetan Plateau(TP) are currently limited in number and low in density and temporal resolution. We investigated the climate condition from about 400 years before present(B.P.) in the central TP at the shore of Co(means 'lake') Nag using aeolian sediments. A 2.7-m sand profile with 57 sediment samples and six optically stimulated luminescence(OSL) samples were studied through grain-size analysis, geochemical elements and parameters, and depositional rate estimation. A previous assumption was verified that sand deposition at the shore of Lake Co Nag originated from hills to the east. Two significant wet periods between 90–140 and about 380 years B.P. were indicated by the variation of element profiles and sediment depositional rates. Aeolian activity is sensitive to variations from different seasonal changing patterns of climate factors in the study area, and aeolian sediments respond differently to climate conditions during the cold little ice age(LIA) and the warm 20 th century. Present day dry seasons of winter and spring might be much warmer and drier compared to seasons of 400 years ago although summer precipitation has increased, resulting in significantly more aeolian activity and higher depositional rate(about 6 times compared to 380–240 years ago) of sandy sediments. Aeolian problems like blown-sand deposition and desertification may be worse in a projected warming future in the central TP as well as other cold and high altitude regions. Our results suggest an agreement with environmental evolution during the little ice age and the 20 th century in a broader scale on the TP. | BenLi Liu JianJun Qu ShiChang Kang Bing Liu | 2018 | Research in Cold and Arid Regions2018，10，2： | 1 |
| 12 | Application and verification of simultaneous determination of cellulose δ^(13)C and δ^(18)O in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method显示文摘Stable isotopes in tree-ring cellulose provide important data in ecological,archaeological,and paleoenvironmental researches,thereby,the demand for stable isotope analyses is increasing rapidly.Simultaneous measurement of cellulose δ^(13)C and δ^(18)O values from tree rings would reduce the cost of isotopic commodities and improve the analytical efficiency compared with conventional separate measurement.In this study,we compared the δ^(13)C and δ^(18)O values of tree-ringα-cellulose from Tianshan spruce(Picea schrenkiana)in an arid site in the drainage basin of the Urumqi River in Xinjiang of northwestern China based on separate and simultaneous measurements,using the combustion method(at1050°C)and the high-temperature pyrolysis method(at 1350°C and 1400°C).We verified the results of simultaneous measurement using the outputs from separate measurement and found that both methods(separate and simultaneous)produced similar δ^(13)C values.The two-point calibrated method improved the results(range and variation)of δ^(13)C and δ^(18)O values.The mean values,standard deviations,and trends of the tree-ring δ^(13)C obtained by the combustion method were similar to those by the pyrolysis method followed by two-point calibration.The simultaneously measured δ^(18)O from the pyrolysis method at 1400°C had a nearly constant offset with that the pyrolysis method at 1350°C due to isotopic-dependence on the reaction temperature.However,they showed similar variations in the time series.The climate responses inferred from simultaneously and separately measured δ^(13)C and δ^(18)O did not differ between the two methods.The tree-ring δ^(13)C and δ^(18)O values were negatively correlated with standardized precipitation evapotranspiration index from May to August.In addition,the δ^(18)O was significantly correlated with temperature(positive),precipitation(negative),and relative humidity(negative)from May to August.The tree-ring δ^(13)C and δ^(18)O values determined simultaneously through the high-temperature pyrolysis method could produce acceptable and reliable stable isotope series.The simultaneous isotopic measurement can greatly reduce the cost and time requirement compared with the separate isotopic measurement.These results are consistent with the previous studies at humid sites,suggesting that the simultaneous determination of δ^(13)C and δ^(18)O in tree-ringα-cellulose can be used in wide regions. | XU Guobao LIU Xiaohong SUN Weizhen CHEN Tuo ZHANG Xuanwen ZENG Xiaomin WU Guoju WANG Wenzhi QIN Dahe | 2018 | Journal of Arid Land2018，10，6： | 1 |
| 13 | 秦岭南坡落叶松树轮α-纤维素葡萄糖单元内氧同位素组成的年内变化特征及其气候关联显示文摘年际或更长时间尺度树木年轮α-纤维素稳定氧同位素组成(δ^(18)O_(α-cell))已被证明与相应时间尺度气候条件(如温度、相对湿度和源水)定量相关,已成为研究(全球)气候历史及植被生态响应的重要指标之一。然而,气候因子和植物生理/代谢过程如何在年内(季节、月甚至周)时间尺度上影响α-纤维素δ^(18)O却知之甚少。本研究选取秦岭南坡针叶树种落叶松为对象,分析其树轮年内α-纤维素分子平均δ^(18)O_(α-cell)(葡萄糖单元中O-2~O-6)及其葡萄糖单元特定位点氧稳定同位素δ^(18)O_(2)及δ^(18)O_(PG)(葡萄糖单元中O-2及O-3~O-6)组成,并结合小时尺度树木径向生长动态记录仪(dendrometer)野外观察记录,基于日尺度气象数据的降雨同位素模拟结果,获得如下认识:1)落叶松α-纤维素葡萄糖单元中O-3~O-6平均同位素组成(δ^(18)O_(PG))与温度和相对湿度的相关性高于α-纤维素分子平均氧同位素组成(δ^(18)O_(α-cell))(温度:糖脎R^(2)=0.736>α-纤维素R^(2)=0.481;相对湿度:糖脎R^(2)=0.488>α-纤维素R2=0.097);2)生长季初期树轮α-纤维素葡萄糖单元中O-2氧同位素组成(δ^(18)O_(2))与源水(source water)的δ^(18)O_(sw)具有一定的相关性(R^(2)=0.378)。 | 祁瑶婷 马然 赵雨 何荣 | 2023 | 第四纪研究2023，43，5： | 0 |
| 14 | Rising utilization of stable isotopes in tree rings for climate change and forest ecology显示文摘Analyses of stable isotopes(C,O,H)in tree rings are increasingly important cross-disciplinary programs.The rapid development in this field documented in an increasing number of publications requires a comprehensive review.This study includes a bibliometric analysis-based review to better understand research trends in tree ring stable isotope research.Overall,1475 publications were selected from the Web of Science Core Collection for 1974-2023.The findings are that:(1)numbers of annual publications and citations increased since 1974.From 1974 to 1980,there were around two relevant publications per year.However,from 2020 to 2022,this rose sharply to 109 publications per year.Likewise,average article citations were less than four per year before 1990,but were around four per article per year after 2000;(2)the major subjects using tree ring stable isotopes include forestry,geosciences,and environmental sciences,contributing to 42.5%of the total during 1974-2023;(3)the top three most productive institutions are the Chinese Academy of Sciences(423),the Swiss Federal Institute for Forest,Snow and Landscape Research(227),and the University of Arizona(204).These achievements result from strong collaborations;(4)review papers,for example,(Dawson et al.,Annu Rev Ecol Syst 33:507-559,2002)and(McCarroll and Loader,Quat Sci Rev 23:771-801,2004),are among the most cited,with more than 1000 citations;(5)tree ring stable isotope studies mainly focus on climatology and ecology,with atmospheric CO_(2) one of the most popular topics.Since 2010,precipitation and drought have received increasing attention.Based on this analysis,the research stages,key findings,debated issues,limitations and direc-tions for future research are summarized.This study serves as an important attempt to understand the progress on the use of stable isotopes in tree rings,providing scientific guid-ance for young researchers in this field. | Ru Huang Chenxi Xu Jussi Grießinger Xiaoyu Feng Haifeng Zhu Achim Bräuning | 2024 | Journal of Forestry Research2024，35，1： | 0 |
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