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Book ; Online: TreeNet - Daten und Analysen der ersten fünf Messjahre

Etzold, Sophia / Zweifel, Roman / Haeni, Matthias

(WSL Berichte ; Heft 72)

2018

Author's details	Sophia Etzold, Roman Zweifel. Mit Beiträgen von: Matthias Haeni [und 9 weiteren]
Series title	WSL Berichte ; Heft 72
Collection
Language	German
Size	1 Online-Ressource (72 Seiten), Illustrationen, Diagramme
Publisher	Eidg. Forschungsanstalt für Wald, Schnee und Landschaft WSL
Publishing place	Birmensdorf
Publishing country	Switzerland
Document type	Book ; Online
HBZ-ID	HT019931374
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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Article ; Online: Contrasting impact of extreme soil and atmospheric dryness on the functioning of trees and forests.

Shekhar, Ankit / Hörtnagl, Lukas / Paul-Limoges, Eugénie / Etzold, Sophia / Zweifel, Roman / Buchmann, Nina / Gharun, Mana

The Science of the total environment

2024 Volume 916, Page(s) 169931

Abstract: Recent studies indicate an increase in the frequency of extreme compound dryness days (days with both extreme soil AND air dryness) across central Europe in the future, with little information on their impact on the functioning of trees and forests. This ...

Abstract	Recent studies indicate an increase in the frequency of extreme compound dryness days (days with both extreme soil AND air dryness) across central Europe in the future, with little information on their impact on the functioning of trees and forests. This study aims to quantify and assess the impact of extreme soil dryness, extreme air dryness, and extreme compound dryness on the functioning of trees and forests. For this, >15 years of ecosystem-level (carbon dioxide and water vapor fluxes) and 6-10 years of tree-level measurements (transpiration and growth) each from a montane mixed deciduous forest (CH-Lae) and a subalpine evergreen coniferous forest (CH-Dav) in Switzerland, is used. The results showed extreme air dryness limitation on CO
MeSH term(s)	Trees ; Ecosystem ; Soil ; Steam ; Forests
Chemical Substances	Soil ; Steam
Language	English
Publishing date	2024-01-08
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2024.169931
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online ; Thesis: The carbon dioxide budget and respiration components of two contrasting forest ecosystems in the Swiss Alps

Etzold, Sophia

2010

Author's details	by Sophia Etzold
Language	English
Size	Online-Ressource (176 S), Ill
Publisher	ETH
Publishing place	Zürich
Document type	Book ; Online ; Thesis
Thesis / German Habilitation thesis	Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 19061--Zürich, 1906
Database	Former special subject collection: coastal and deep sea fishing

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Book ; Online ; Thesis: The carbon dioxide budget and respiration components of two contrasting forest ecosystems in the Swiss Alps

Etzold, Sophia

2010

Author's details	by Sophia Etzold
Language	English
Size	Online-Ressource (176 S), Ill
Publisher	ETH
Publishing place	Zürich
Document type	Book ; Online ; Thesis
Thesis / German Habilitation thesis	Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 19061--Zürich, 1906
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Towards monitoring stem growth phenology from space with high resolution satellite data

Eitel, Jan U.H. / Basler, David / Braun, Sabine / Buchmann, Nina / D'Odorico, Petra / Etzold, Sophia / Gessler, Arthur / Griffin, Kevin L. / Krejza, Jan / Luo, Yunpeng / Maguire, Andrew J. / Rao, Mukund P. / Vitasse, Yann / Walthert, Lorenz / Zweifel, Roman

Agricultural and Forest Meteorology. 2023 Aug., v. 339 p.109549-

2023

Abstract: Radial stem growth is a key ecosystem process resulting in long-term carbon sequestration. Despite recognition of its importance to global carbon cycling, high uncertainties remain regarding how radial growth phenology (e.g., the onset, mid, and ... ...

Abstract	Radial stem growth is a key ecosystem process resulting in long-term carbon sequestration. Despite recognition of its importance to global carbon cycling, high uncertainties remain regarding how radial growth phenology (e.g., the onset, mid, and cessation of radial growth) will be affected by climate change. In this study, we evaluated to what extent high spatially (3 × 3 m) and temporally (up to daily) resolved satellite imagery from PlanetScope can be used to monitor stem growth phenology. For this, we made use of detailed stem growth phenological observations of six common European tree species measured by automated point dendrometers at 14 distinct sites across Switzerland between 2017 and 2021. These growth phenological observations were then linked through multiple regression modeling with metrics extracted from spectral index time series. Our results show that the remote sensing-based models enable monitoring the onset (root mean squared deviation (RMSD) ranges from 5.96 to 27.04 days) and mid-stages of stem growth (RMSD ranges from 10.20 to 36.34 days) with reasonable accuracy as opposed to the cessation of stem growth that showed low accuracy (RMSD ranges from 16.02 to 153.63 days). The accuracy of the remote sensing-based prediction models and their optimal suite of predictors varied across species. The latter has important implications for the remote sensing of stem growth phenology in mixed forests, suggesting that it is important for satellite sensors to resolve individual tree crowns. Overall, our results suggest the need for novel spectral indices that capture the spectral components of mechanistic linkages between stem growth and canopy properties that go beyond the mere detection of leaf phenology. When employing such spectral indices, remote sensing could make it possible to detect not only shifts in leaf phenology caused by climate change but also those in stem growth on a broad spatial scale.
Keywords	automation ; canopy ; carbon ; carbon sequestration ; climate change ; dendrometers ; ecosystems ; forests ; leaves ; meteorology ; phenology ; prediction ; regression analysis ; remote sensing ; satellites ; stem elongation ; time series analysis ; trees ; Switzerland ; PlanetScope ; Dendrometer ; Intra-annual tree growth ; Radial growth phenology index (RGPI)
Language	English
Dates of publication	2023-08
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	409905-9
ISSN	0168-1923
ISSN	0168-1923
DOI	10.1016/j.agrformet.2023.109549
Database	NAL-Catalogue (AGRICOLA)

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Article: High growth potential of Ailanthus altissima in warm and dry weather conditions in novel forests of southern Switzerland

Knüsel, Simon / Bugmann, Harald / Conedera, Marco / Etzold, Sophia / Wunder, Jan / Zweifel, Roman

Trees. 2019 Apr., v. 33, no. 2

2019

Abstract: KEY MESSAGE: Our analysis of short-term growth responses to weather conditions provided evidence that the non-native tree species Ailanthus altissima may have a high growth potential in a warmer and drier environment, as predicted by global warming ... ...

Abstract	KEY MESSAGE: Our analysis of short-term growth responses to weather conditions provided evidence that the non-native tree species Ailanthus altissima may have a high growth potential in a warmer and drier environment, as predicted by global warming scenarios. Non-native tree species may alter ecosystem services in colonized forest communities. These novel forests represent a challenge for management, which is further accentuated by anthropogenic global change. Knowledge on the intra-annual growth performance and tree water relations of established and novel tree species is required to elucidate the drivers underlying forest dynamics. Here, we analysed intra-annual radial growth of the introduced tree species Ailanthus altissima (Mill.) Swingle and co-occurring Castanea sativa Mill. in novel forest communities in southern Switzerland. We used four years of continuously measured growth data in two sites to identify weather conditions in which the species achieved highest hourly growth and conditions in which largest proportions of seasonal growth occurred. While both species reached the largest proportion of seasonal growth and achieved the highest hourly growth under the most frequent weather conditions, A. altissima featured the highest growth rates in a wider range of weather conditions than C. sativa, particularly at high temperature and high vapour pressure deficit. We conclude that A. altissima has a greater potential than C. sativa to sustain growth in warm-dry conditions. Importantly, the advantages of A. altissima may be more accentuated in forest stands with low interspecific competition.
Keywords	Ailanthus altissima ; Castanea sativa ; ecosystem services ; forest dynamics ; forest stands ; forests ; global warming ; growth performance ; interspecific competition ; introduced plants ; seasonal growth ; temperature ; trees ; vapor pressure deficit ; Switzerland
Language	English
Dates of publication	2019-04
Size	p. 395-409.
Publishing place	Springer Berlin Heidelberg
Document type	Article
ZDB-ID	90595-1
ISSN	1432-2285 ; 0931-1890
ISSN (online)	1432-2285
ISSN	0931-1890
DOI	10.1007/s00468-018-1785-x
Database	NAL-Catalogue (AGRICOLA)

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Z 4635: Show issues

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Article: Why trees grow at night

Zweifel, Roman / Sterck, Frank / Braun, Sabine / Buchmann, Nina / Eugster, Werner / Gessler, Arthur / Häni, Matthias / Peters, Richard L. / Walthert, Lorenz / Wilhelm, Micah / Ziemińska, Kasia / Etzold, Sophia

The new phytologist. 2021 Sept., v. 231, no. 6

2021

Abstract: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day–night conditions on tree growth remained uncertain. Here we ... ...

Abstract	The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day–night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly‐resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 yr. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species‐specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
Keywords	air ; carbon ; forests ; soil ; solar radiation ; stem elongation ; tree growth ; vapor pressure deficit
Language	English
Dates of publication	2021-09
Size	p. 2174-2185.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	208885-x
ISSN	1469-8137 ; 0028-646X
ISSN (online)	1469-8137
ISSN	0028-646X
DOI	10.1111/nph.17552
Database	NAL-Catalogue (AGRICOLA)

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Article: Number of growth days and not length of the growth period determines radial stem growth of temperate trees

Etzold, Sophia / Sterck, Frank / Bose, Arun K. / Braun, Sabine / Buchmann, Nina / Eugster, Werner / Gessler, Arthur / Kahmen, Ansgar / Peters, Richard L. / Vitasse, Yann / Walthert, Lorenz / Ziemińska, Kasia / Zweifel, Roman

Ecology letters. 2022 Feb., v. 25, no. 2

2022

Abstract: Radial stem growth dynamics at seasonal resolution are essential to understand how forests respond to climate change. We studied daily radial growth of 160 individuals of seven temperate tree species at 47 sites across Switzerland over 8 years. Growth of ...

Abstract	Radial stem growth dynamics at seasonal resolution are essential to understand how forests respond to climate change. We studied daily radial growth of 160 individuals of seven temperate tree species at 47 sites across Switzerland over 8 years. Growth of all species peaked in the early part of the growth season and commenced shortly before the summer solstice, but with species‐specific seasonal patterns. Day length set a window of opportunity for radial growth. Within this window, the probability of daily growth was constrained particularly by air and soil moisture, resulting in intermittent growth to occur only on 29 to 77 days (30% to 80%) within the growth period. The number of days with growth largely determined annual growth, whereas the growth period length contributed less. We call for accounting for these non‐linear intra‐annual and species‐specific growth dynamics in tree and forest models to reduce uncertainties in predictions under climate change.
Keywords	air ; climate change ; ecology ; forests ; photoperiod ; soil water ; stem elongation ; summer ; trees ; Switzerland
Language	English
Dates of publication	2022-02
Size	p. 427-439.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	LETTER
ZDB-ID	1441608-6
ISSN	1461-0248 ; 1461-023X
ISSN (online)	1461-0248
ISSN	1461-023X
DOI	10.1111/ele.13933
Database	NAL-Catalogue (AGRICOLA)

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Article: One Century of Forest Monitoring Data in Switzerland Reveals Species- and Site-Specific Trends of Climate-Induced Tree Mortality.

Etzold, Sophia / Ziemińska, Kasia / Rohner, Brigitte / Bottero, Alessandra / Bose, Arun K / Ruehr, Nadine K / Zingg, Andreas / Rigling, Andreas

Frontiers in plant science

2019 Volume 10, Page(s) 307

Abstract: Climate-induced tree mortality became a global phenomenon during the last century and it is expected to increase in many regions in the future along with a further increase in the frequency of drought and heat events. However, tree mortality at the ... ...

Abstract	Climate-induced tree mortality became a global phenomenon during the last century and it is expected to increase in many regions in the future along with a further increase in the frequency of drought and heat events. However, tree mortality at the ecosystem level remains challenging to quantify since long-term, tree-individual, reliable observations are scarce. Here, we present a unique data set of monitoring records from 276 permanent plots located in 95 forest stands across Switzerland, which include five major European tree species (Norway spruce, Scots pine, silver fir, European beech, and sessile and common oak) and cover a time span of over one century (1898-2013), with inventory periods of 5-10 years. The long-term average annual mortality rate of the investigated forest stands was 1.5%. In general, species-specific annual mortality rates did not consistently increase over the last decades, except for Scots pine forests at lower altitudes, which exhibited a clear increase of mortality since the 1960s. Temporal trends of tree mortality varied also depending on diameter at breast height (DBH), with large trees generally experiencing an increase in mortality, while mortality of small trees tended to decrease. Normalized mortality rates were remarkably similar between species and a modest, but a consistent and steady increasing trend was apparent throughout the study period. Mixed effects models revealed that gradually changing stand parameters (stand basal area and stand age) had the strongest impact on mortality rates, modulated by climate, which had increasing importance during the last decades. Hereby, recent climatic changes had highly variable effects on tree mortality rates, depending on the species in combination with abiotic and biotic stand and site conditions. This suggests that forest species composition and species ranges may change under future climate conditions. Our data set highlights the complexity of forest dynamical processes such as long-term, gradual changes of forest structure, demography and species composition, which together with climate determine mortality rates.
Language	English
Publishing date	2019-03-22
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2711035-7
ISSN	1664-462X
ISSN	1664-462X
DOI	10.3389/fpls.2019.00307
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Number of growth days and not length of the growth period determines radial stem growth of temperate trees.

Etzold, Sophia / Sterck, Frank / Bose, Arun K / Braun, Sabine / Buchmann, Nina / Eugster, Werner / Gessler, Arthur / Kahmen, Ansgar / Peters, Richard L / Vitasse, Yann / Walthert, Lorenz / Ziemińska, Kasia / Zweifel, Roman

Ecology letters

2021 Volume 25, Issue 2, Page(s) 427–439

Abstract	Radial stem growth dynamics at seasonal resolution are essential to understand how forests respond to climate change. We studied daily radial growth of 160 individuals of seven temperate tree species at 47 sites across Switzerland over 8 years. Growth of all species peaked in the early part of the growth season and commenced shortly before the summer solstice, but with species-specific seasonal patterns. Day length set a window of opportunity for radial growth. Within this window, the probability of daily growth was constrained particularly by air and soil moisture, resulting in intermittent growth to occur only on 29 to 77 days (30% to 80%) within the growth period. The number of days with growth largely determined annual growth, whereas the growth period length contributed less. We call for accounting for these non-linear intra-annual and species-specific growth dynamics in tree and forest models to reduce uncertainties in predictions under climate change.
MeSH term(s)	Climate Change ; Humans ; Seasons ; Soil ; Species Specificity
Chemical Substances	Soil
Language	English
Publishing date	2021-12-09
Publishing country	England
Document type	Letter
ZDB-ID	1441608-6
ISSN	1461-0248 ; 1461-023X
ISSN (online)	1461-0248
ISSN	1461-023X
DOI	10.1111/ele.13933
Database	MEDical Literature Analysis and Retrieval System OnLINE

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