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Elevation response of above-ground net primary productivity for Picea crassifolia to climate change in Qilian Mountains of Northwest China based on tree rings

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Journal of Geographical Sciences 2024年第1期34卷 146-164页

作者： WU Xuan JIAO Liang DU Dashi xue ruhong WEI Mengyuan ZHANG Peng College of Geography and Environment Science Northwest Normal UniversityLanzhou 730070China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityLanzhou 730070China

Current ecosystem models used to simulate global terrestrial carbon balance generally suggest that terrestrial landscapes are stable and mature,but terrestrial net primary productivity(NPP)data estimated without accounting for disturbances in species composition,environment,structure,and ecological characteristics will reduce the accuracy of the global carbon ***,the steady-state assumption and neglect of elevation-related changes in forest NPP is a *** Qilian Mountains are located in continental climate zone,and vegetation is highly sensitive to climate *** quantified aboveground biomass(AGB)and aboveground net primary productivity(ANPP)sequences at three elevations using field-collected tree rings of Picea crassifolia in Qilian Mountains of Northwest *** results showed that(1)There were significant differences between AGB and ANPP at the three elevations,and the growth rate of AGB was the highest at the low elevation(55.99 t ha^(–1)10a^(–1)).(2)There are differences in the response relationship between the ANPP and climate factors at the three elevations,and drought stress is the main climate signal affecting the change of ANPP.(3)Under the future climate scenario,drought stress intensifies,and the predicted decline trend of ANPP at the three elevations from mid-century to the end of this century is–0.025 t ha^(–1)10a^(–1),respectively;–0.022 t ha^(–1)10a^(–1);At–0.246 t ha^(–1)10a^(–1),the level of forest productivity was significantly *** results reveal the elevation gradient differences in forest productivity levels and provide key information for studying the carbon sink potential of boreal forests.

关键词： global climate change tree ring aboveground net primary productivity aboveground biomass drought stress Qilian Mountains

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Radial growth in Qinghai spruce is most sensitive to severe drought in the Qilian Mountains of Northwest China

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Journal of Forestry Research 2024年第3期35卷 73-86页

作者： Xuge Wang Liang Jiao ruhong xue Peng Zhang Dashi Du Mengyuan Wei Qian Li College of Geography and Environmental Science Northwest Normal UniversityNo.967Anning East RoadLanzhou 730070People's Republic of China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityLanzhou 730070Gansu ProvincePeople's Republicof China

Global warming and frequent extreme drought events lead to tree death and extensive forest decline,but the underlying mechanism is not *** drought years,cambial development is more sensitive to climate change,but in different phenological stages,the response rela-tionship is ***,the dynamic relationship between tree radial growth and climatic/environmental fac-tors needs to be *** thus continuously monitored radial growth of Qinghai spruce(Picea crassifolia Kom.)and environmental factors from January 2021 to November 2022 using point dendrometers and portable meteorological weather stations in the central area of the Qilian *** relationship and stability between the radial growth of Qinghai spruce and environmental factors were compared for different levels of drought in 2021 and *** year 2022 had higher temperatures and less precipitation and was drier than *** with 2021,the growing period in 2022 for Qinghai spruce was 10 days shorter,maximum growth rate(Grmax)was 4.5μm·d^(-1) slower,and the initiation of growth was 6 days *** of Qinghai spruce was always restricted by drought,and the stem radial increment(SRI)was more sensitive to precipitation and air relative *** changes in cumulative radial growth were divided into four phenological stages according to the time of growth onset,cessation,and maximum growth rate(Grmax)of Qinghai *** responses of SRI to climate change were stronger in Stage 3 and Stage 4 of 2021 and stronger in Stage 1(initiation growth stage)and Stage 3 of *** results provide important information on the growth of the trees in response to drought and for specific managing forests as the climate warms.

关键词： Picea crassifolia Radial growth dynamics Severe drought Response stability Point dendrometer

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Climate response and radial growth of Pinus tabulaeformis at different altitudes in Qilian Mountains

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Research in Cold and Arid Regions 2021年第6期13卷 496-509页

作者： Liang Jiao ChangLiang Qi ruhong xue Ke Chen XiaoPing Liu College of Geography and Environmental Science Northwest Normal UniversityNo.967Anning East RoadLanzhouGansu 730070China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityNo.19Xinjiekou‐wai StreetHaidian DistrictBeijing 100875China

In order to test whether the relationship between climate and the radial growth of trees is affected by altitude,altitude variability and time stability of climate-influenced radial growth of a dominant conifer,Chinese pine(Pinus tabulaeformis),in the eastern Qilian Mountains were studied against the background of climate change using *** show that 1)droughts at the end of the growing season of last year and during the early and middle growing season of the current year were the main limiting factors for the radial growth of Chinese pine at two altitude gradients;this was determined by analyzing the relationship between tree-ring width chronologies and climate factors.2)The sensitivity of the radial growth of trees to climate change gradually decreased and was affected more by drought stress at a lower altitude.3)An unstable divergence response was observed in the radial growth at the two altitudes,in response to controlling climatic factors;this observation was based on the moving correlation analysis of growth/climate relationships,and the aggravation of drought stress caused by increasing temperature was the main reason.4)The growth rate of Chinese pine at the two altitudes increased at first and then decreased,as measured by basal area increment(BAI)*** temperature rises may have significant effects on mountain forest ecosystems in arid and semi-arid *** management and protection measures should be taken,according to the response patterns of trees to climate change at different altitude gradients.

关键词： eastern Qilian Mountains altitude effect drought stress divergence response Pinus tabulaeformis

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腾格里沙漠南缘昌岭山1872年以来干湿变化研究

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干旱区研究 2021年第5期38卷 1318-1326页

作者：祁京焦亮陈可柒常亮薛儒鸿西北师范大学地理与环境科学学院甘肃兰州730070 甘肃省绿洲资源环境与可持续发展重点实验室甘肃兰州730070

选取腾格里沙漠南缘对气候变化敏感的昌岭山为研究区,通过分析昌岭山优势树种青海云杉树轮宽度年表与气候因子的相关关系,得出5—7月PDSI(帕默尔干旱指数)与树轮宽度年表的相关性较强(r=0.621,P<0.001),干旱是影响树木径向生长的主控气... 详细信息

选取腾格里沙漠南缘对气候变化敏感的昌岭山为研究区,通过分析昌岭山优势树种青海云杉树轮宽度年表与气候因子的相关关系,得出5—7月PDSI(帕默尔干旱指数)与树轮宽度年表的相关性较强(r=0.621,P<0.001),干旱是影响树木径向生长的主控气候因子;通过建立树轮宽度年表和PDSI的线性回归方程,重建了研究区过去146 a以来的PDSI干旱变化;同时基于重建的PDSI的年际变化表明:研究区在过去146 a间共经历了4个干旱期(1882—1894年,1915—1936年,1966—1978年,1989—2015年)。周期分析结果显示重建序列存在2 a、2.6~3 a、11 a左右的变化周期,说明研究区气候变化主要受厄尔尼诺-南方涛动(ENSO)和太阳黑子活动的驱动。研究结论对于探讨中国西北干湿变化规律及预测未来气候变化条件下该区域亚高山森林生态系统的变化提供了科学依据。

关键词：青海云杉 PDSI 干湿历史变化树轮宽度年表昌岭山腾格里沙漠

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SOMATIC CELL FUSION AND HYBRID FORMATION OF A CHINESE HAMSTER CELL LINE AND HUMAN LYMPHOCYTES

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Chinese Science Bulletin 1983年第6期28卷 860-页

作者：邱信芳周洁民钱汝红薛京伦刘祖洞 Institute of Genetics Fudan University Shanghai

The Chinese hamster cell line Wg3-h and human lymphocytes were used as parental cells for the fusion experiment. The spontaneous fusion rate was below 10-7, but in the presence of UVinactivated Sendai virus, the fusion rate was increased by one hundred-fold After fusion, hybrid cells were selected in HAT medium containing hypoxanthine, aminopterin and thymidine such that only HGPRT cells survived. Aminopterin blocks the de novo synthesis of purine and pyrimidine which can be produced through the sal-

关键词： pyrimidine CELL thymidine parental purine hundred blocks spontaneous survive distinguished

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建筑环境设计模拟工具包DeST

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暖通空调 1999年第4期29卷 58-63页

作者：陈锋邓宇春薛志峰吴如宏清华同方研究发展中心清华大学

建筑环境设计模拟工具包ＤｅＳＴ是基于功能的模拟软件，用于对建筑、方案、系统及水力计算进行模拟，以校核设计，保证设计的可靠性。介绍了ＤｅＳＴ的结构、用户界面，并结合工程实例说明了ＤｅＳＴ的应用。

关键词：建筑环境模拟软件设计校核 DeST

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