期刊
FORESTS
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/f12030283
关键词
dendrometer; sap flow; daily correlations; tree– ring width; physiological response
类别
资金
- TERENO (Terrestrial Environmental Observatories - Helmholtz-Gemeinschaft)
- Hessen State Ministry for Higher Education, Research and the Arts, Germany, as part of the LOEWE priority project Nature 4.0-Sensing Biodiversity, subproject UM2
The European heat wave of 2018 brought about dry and hot conditions in many parts of central and northern Europe, significantly impacting plant life, especially trees. A study comparing the responses of spruce and oak trees in Western and Central-Western Germany during this heat wave revealed that while spruce trees completed their growth activities early, oaks intensified their activities based on water content in their stems.
The European heat wave of 2018 was characterized by extraordinarily dry and hot spring and summer conditions in many central and northern European countries. The average temperatures from June to August 2018 were the second highest since 1881. Accordingly, many plants, especially trees, were pushed to their physiological limits. However, while the drought and heat response of field crops and younger trees have been well investigated in laboratory experiments, little is known regarding the drought and heat response of mature forest trees. In this study, we compared the response of a coniferous and a deciduous tree species, located in western and central-western Germany, to the extreme environmental conditions during the European heat wave of 2018. Combining classic dendroecological techniques (tree-ring analysis) with measurements of the intra-annual stem expansion (dendrometers) and tree water uptake (sap flow sensors), we found contrasting responses of spruce and oak trees. While spruce trees developed a narrow tree ring in 2018 combined with decreasing correlations of daily sap flow and dendrometer parameters to the climatic parameters, oak trees developed a ring with above-average tree-ring width combined with increasing correlations between the daily climatic parameters and the parameters derived from sap flow and the dendrometer sensors. In conclusion, spruce trees reacted to the 2018 heat wave with the early completion of their growth activities, whereas oaks appeared to intensify their activities based on the water content in their tree stems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据