检索结果-南通市图书馆

Chinese Science Bulletin 2011年第14期56卷 1518-1525页

作者： ZHANG YongXiang SHAO XueMei XU Yan wilmking martin Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Institute for Botany and Landscape Ecology University Greifswald 17487 Greifswald Germany

Sabina przewalskii is the longest living endemic tree species in the northeastern Tibetan Plateau,and has been widely employed in tree ring based climate research in ***,most dendroclimatic reconstructions have been primarily based on empirical relationships between tree growth and climate factors identified by statistical *** date,the physiological relationships between tree growth and their limiting climate factors have not been properly ***,we simulated the physiological response of Sabina przewalskii tree growth to major limiting climate factors based on the Vaganov-Shashkin (VS) *** VS modeled results validated the relationships between tree ring and climate factors constructed by statistical models,both approaches suggesting that precipitation during the early growing season,especially in May and June,has significant effect on tree growth,while temperature mainly affects tree growth by warming-induced drought and by extending the growing *** current and projected climate scenarios,our modeling results predict an increase in radial growth of Sabina przewalskii around the Qaidam Basin,with the potential outcome that regional forests will increase their capacity to sequester carbon.

关键词：青藏高原东北部气候因素柴达木盆地模拟分析祁连圆柏生长反应基础树木生长

Tapping the tree-ring archive for studying effects of resin extraction on the growth and climate sensitivity of Scots pine

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2017年第3期4卷 167-173页

作者： Ernst van der Maaten Annemarie Mehl martin wilmking Marieke van der Maaten-Theunissen Institute of Botany and Landscape Ecology University of Greifswald

Background： In the German Democratic Republic（GDR）, resin tapping in Scots pine（Pinus sylvestris L.） forests was a major economic activity, and resin-tapped stands are frequently found up until this day. In this study, we investigate how the mechanical damage caused by resin tapping affects the growth and climate sensitivity of Scots pine using a dendroecological ***： Tree-ring samples were collected from resin-tapped and non-tapped trees in two forest areas in northeastern Germany, and tree-growth patterns were analyzed. For elucidating effects of resin tapping on the climate sensitivity of pine growth, climate-growth relationships and pointer years were ***： We observed that resin tapping positively affects tree growth at breast height, likely as wood formation is concentrated on the living part of the bole（i.e. after tapping there is no growth taking place on the tapping face due to the mechanical damage done to the cambium）. We observed no differences in the climate sensitivity of tapped and non-tapped trees, nor in the occurrence of extreme growth ***： Our results highlight that resin extraction is, apart from inflicting mechanical damage, not altering the sensitivity of Scots pine growth to climatic conditions.

关键词： Climate-growth relationships Dendroecology Mechanical damage

Drought sensitivity of beech on a shallow chalk soil in northeastern Germany - a comparative study

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2017年第1期4卷 45-54页

作者： Marieke van der Maaten-Theunissen Hanna Bummerstede Janette Iwanowski Tobias Scharnweber martin wilmking Ernst van der Maaten Institute of Botany and Landscape Ecology University of Greifswald Soldmannstr 15 17487 Greifswald Germany

Background： We compare the climate sensitivity of European beech （Fagus sylvatica L.） in two forest nature reserves in northeastern Germany. The one reserve, Schlossberg, is characterized by shallow chalk soils, whereas in the other reserve, EIdena, soils are deeper and more developed. Little is known about the drought sensitivity of beech on shallow chalk soils. Methods： We collected increment cores at both research sites and established climate-growth relationships. Inter- tree variability was assessed by employing linear mixed-effect models. Results： We expected to find distinctively higher drought sensitivity at Schlossberg due to limited water availability, but find only marginal differences in growth responses. At both sites, drought is the major climatic factor driving tree growth. Adaptations in tree architecture and an underestimation of the water holding capacity of shallow chalk soils are discussed as possible reasons for not finding more distinct climate responses. In analyzing climate-growth relationships, we specifically focused on growth responses of individual trees but observed only low inter-tree variability at both sites. Evident is a shift in climate response patterns from the first to the second half of the twentieth century with previous-year drought conditions becoming more important than current-year drought. This shift is discussed in relation to a warming trend over that same period, as well as possible trends in masting behavior of beech. Conclusion： The investigated beech trees on the shallow chalk soil are only slightly more drought sensitive than beech trees on the reference site with deeper and more developed soils.

关键词： Climate-growth relationships Dendroecology Inter-tree variability Temporal stability Drought stress

Expansion of Juniperus sibirica *** a response to climate change and associated effect on mountain tundra vegetation in the Northern Urals

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第10期17卷 2339-2353页

作者： Andrey A.GRIGORIEV Yulia V.SHALAUMOVA Olga V.EROKHINA Svetlana Yu.SOKOVNINA Elizaveta I.VATOLINA martin wilmking Institute of Plant and Animal Ecology UB RAS Laboratory of Geoinformation TechnologyEkaterinburgRussia Institute of Industrial Ecology UB RAS Laboratory of Mathematical Modeling in Ecology and MedicineEkaterinburgRussia Institute of Plant and Animal Ecology UB RAS Laboratory of Vegetation and Mycobiota BiodiversityEkaterinburgRussia Institute of Plant and Animal Ecology UB RAS Laboratory of Dynamics of Arctic EcosystemsLabytnangiRussia Department of Forest Taxation and Forest Management Institute of Forest and Nature ManagementUral state Forest Engineering UniversityEkaterinburgRussia Institute for Botany and Landscape Ecology Greifswald UniversityGreifswaldGermany

Shrub expansion into arctic and alpine tundra is one of the prominent vegetation changes currently *** studied the expansion of shrub vegetation into high elevation tundra in the Kvarkush Range of the Northern Ural mountains,*** structure analysis of the dominant shrub Juniperus sibirica *** to support ongoing upslope advance of shrubs,a process particularly active in the second half of the 20 th *** found a close connection between the expansion of shrub vegetation and the general change in climatic conditions of the cold season(months with mean airtemperature below 0°Сfrom November to March).In general,the greatest influence on the distribution of *** is exerted by the climate conditions of the beginning(November-January)and the end(March)of the cold *** increasing elevation,the correlation coefficients between the establishment of *** shrubs and the precipitation of the beginning of the cold season increased,and reached maximum values at the top elevation level of the study ***,the upwards shift of *** into typical mountain tundra does not lead to changes in the ecological structure of vegetation at this stage,but simply a decrease in the area of mountain tundra.

关键词： Juniperus sibirica Expansion Tundra Vegetation Plant communities Climate changes Northern Ural mountains

利用生理模型模拟的柴达木东北缘祁连圆柏对气候要素的响应过程

在线全文

学校读者我要写书评

暂无评论

科学通报 2011年第12期56卷 971-978页

作者：张永香邵雪梅徐岩 wilmking martin 中国科学院地理科学与资源研究所北京100101 Institute for Botany and Landscape Ecology University Greifswald

借助Vaganov-Shashkin模型,从生理过程的角度讨论了柴达木祁连圆柏径向生长与主要限制性气候因子之间的关系.模拟结果表明,祁连圆柏生长对其主要限制性气候因子的响应过程主要发生在生长季的前期.具体来讲,降水(尤其是5和6月的降水)对... 详细信息

借助Vaganov-Shashkin模型,从生理过程的角度讨论了柴达木祁连圆柏径向生长与主要限制性气候因子之间的关系.模拟结果表明,祁连圆柏生长对其主要限制性气候因子的响应过程主要发生在生长季的前期.具体来讲,降水(尤其是5和6月的降水)对祁连圆柏年径向生长起着决定性作用;而气温的影响主要表现为夏季高温对生长的抑制以及伴随全球变暖所出现的生长季延长.另外,模拟结果也揭示出近20年来随着区域水分条件的增加,祁连圆柏径向生长量也随之出现增长趋势.这些均预示着若这一暖湿的气候条件持续发展,将不但有助于祁连圆柏在该区域的生长,也有益于增加区域森林的碳积累.

关键词：柴达木东北缘祁连圆柏生理响应过程 Vaganov—Shashkin模型