Twentieth century redistribution in climatic drivers of global tree growth

Science Advances, Journal Year: 2019, Volume and Issue: 5(1)

Published: Jan. 4, 2019

Water availability and demand are becoming the dominant limitations of tree growth across boreal temperate zones.

Language: Английский

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Structural overshoot of tree growth with climate variability and the global spectrum of drought‐induced forest dieback

Global Change Biology, Journal Year: 2017, Volume and Issue: 23(9), P. 3742 - 3757

Published: Jan. 30, 2017

Abstract Ongoing climate change poses significant threats to plant function and distribution. Increased temperatures altered precipitation regimes amplify drought frequency intensity, elevating stress mortality. Large‐scale forest mortality events will have far‐reaching impacts on carbon hydrological cycling, biodiversity, ecosystem services. However, biogeographical theory global vegetation models poorly represent recent die‐off patterns. Furthermore, as trees are sessile long‐lived, their responses extremes substantially dependent historical factors. We show that periods of favourable climatic management conditions facilitate abundant tree growth can lead structural overshoot aboveground biomass due a subsequent temporal mismatch between water demand availability. When environmental favourability declines, increases in temperature protracted, rapid, or both, drive gradient modify self‐thinning relationships. Responses ranging from premature leaf senescence partial canopy dieback whole‐tree reduce area during the period for lagged recovery window thereafter. Such mismatches requirements availability occur at local regional scales throughout species geographical range. As projections predict large future fluctuations both wet dry conditions, we expect forests become increasingly structurally mismatched thus overbuilt more stressful episodes. By accounting context development, our approach explain previously problematic aspects large‐scale mortality, such why it range yet still be locally highly variable, some seem readily attributable an ongoing while others do not. This refined understanding better responses, enabling improved prediction changes distribution scales.

Language: Английский

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Temporal trade-off between gymnosperm resistance and resilience increases forest sensitivity to extreme drought

Nature Ecology & Evolution, Journal Year: 2020, Volume and Issue: 4(8), P. 1075 - 1083

Published: June 15, 2020

Language: Английский

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When tree rings go global: Challenges and opportunities for retro- and prospective insight

Quaternary Science Reviews, Journal Year: 2018, Volume and Issue: 197, P. 1 - 20

Published: Aug. 8, 2018

Language: Английский

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Global assessment of relationships between climate and tree growth

Global Change Biology, Journal Year: 2020, Volume and Issue: 26(6), P. 3212 - 3220

Published: March 3, 2020

Tree-ring records provide global high-resolution information on tree-species responses to change, forest carbon and water dynamics, past climate variability extremes. The underlying assumption is a stationary (time-stable), quasi-linear relationship between tree growth environment, which however conflicts with basic ecological evolutionary theory. Indeed, our assessment of the relevant tree-ring literature demonstrates non-stationarity in majority tested cases, not limited specific proxies, environmental parameters, regions or species. Non-stationarity likely represents general nature tree-growth proxies environment. Studies assuming stationarity score two times more citations influencing other fields science science-policy interface. To reconcile reality application for estimates, we clarification concept, propose simple confidence framework re-evaluation existing studies recommend use new statistical tool detect proxies. Our contribution meant stimulate facilitate discussion light results help increase tree-ring-based estimates science, public policymakers.

Language: Английский

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Tree growth influenced by warming winter climate and summer moisture availability in northern temperate forests

Global Change Biology, Journal Year: 2019, Volume and Issue: 26(4), P. 2505 - 2518

Published: Dec. 20, 2019

The role of future forests in global biogeochemical cycles will depend on how different tree species respond to climate. Interpreting the response forest growth climate change requires an understanding temporal and spatial patterns seasonal climatic influences common species. We constructed a new network 310 tree-ring width chronologies from three (Quercus robur, Pinus sylvestris Fagus sylvatica) collected for ecological, management purposes south Baltic Sea region at border bioclimatic zones (temperate continental, oceanic, southern boreal). major factors (temperature, precipitation, drought) affecting monthly scales were identified. Our analysis documents that 20th century Scots pine deciduous is generally controlled by parameters, summer moisture availability increasingly important examined. report changes influence winter variables over last decades, where decreasing late temperature increasing was found. By comparing climate-growth responses 1943-1972 1973-2002 periods characterizing site-level stability, descriptive application segregation distinguished sites with stable dominant parameters (northeast study region), collectively showed unstable (southeast region). findings presented here highlight temporally nonuniform variability, there are geographical coherent regions these similar. Considering continued future, our results provide regional perspectives recent broad-scale relationships trees across temperate boreal transition around Sea.

Language: Английский

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An earlier start of the thermal growing season enhances tree growth in cold humid areas but not in dry areas

Nature Ecology & Evolution, Journal Year: 2022, Volume and Issue: 6(4), P. 397 - 404

Published: Feb. 28, 2022

Language: Английский

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Warming-induced tree growth may help offset increasing disturbance across the Canadian boreal forest

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(2)

Published: Jan. 3, 2023

Large projected increases in forest disturbance pose a major threat to future wood fiber supply and carbon sequestration the cold-limited, Canadian boreal ecosystem. Given large sensitivity of tree growth temperature, warming-induced productivity have potential reduce these threats, but research efforts date yielded contradictory results attributed limited data availability, methodological biases, regional variability dynamics. Here, we apply machine learning algorithm an unprecedented network over 1 million records (1958 2018) from 20,089 permanent sample plots distributed across both Canada United States, spanning 16.5 °C climatic gradient. Fitted models were then used project near-term (2050 s time period) six most abundant species forest. Our reveal large, positive effect increasing thermal energy on for target species, leading 20.5 22.7% gains with climate change under RCP 4.5 8.5. The magnitude gains, which peak colder wetter regions forest, suggests that should no longer be considered marginal may fact significantly offset some negative impacts drought wildfire implications ecological forecasts global economy.

Language: Английский

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The International Tree‐Ring Data Bank (ITRDB) revisited: Data availability and global ecological representativity

Journal of Biogeography, Journal Year: 2018, Volume and Issue: 46(2), P. 355 - 368

Published: Dec. 5, 2018

Abstract Aim The International Tree‐Ring Data Bank ( ITRDB ) is the most comprehensive database of tree growth. To evaluate its usefulness and improve accessibility to broad scientific community, we aimed to: (a) quantify biases, (b) assess how well it represents global forests, (c) develop tools identify priority areas representativity, d) make available corrected database. Location Worldwide. Time period Contributed datasets between 1974 2017. Major taxa studied Trees. Methods We identified formatting issues in all individual . then calculated representativity with respect species, spatial coverage, climatic regions, elevations, need for data update, limitations on growth, vascular plant diversity, associated animal diversity. combined these metrics into a Priority Sampling Index PSI highlight ways representativity. Results Our refined dataset provides access network >52 million growth points worldwide. found, however, that dominated by trees from forests low semi‐arid climates, coniferous western North America. Conifers represented 81% even well‐sampled areas, broadleaves were poorly represented. stressed increase diversity terms broadleaf species regions require attention. Great gains will be made increasing research sharing African, Asian, South American forests. Main conclusions extensive coverage show great promise address macroecological questions. achieve this, have overcome significant gaps A strategic organized group effort required, hope provided here can guide efforts this invaluable

Language: Английский

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Climate Change and Future Fire Regimes: Examples from California

Geosciences, Journal Year: 2016, Volume and Issue: 6(3), P. 37 - 37

Published: Aug. 17, 2016

Climate and weather have long been noted as playing key roles in wildfire activity, global warming is expected to exacerbate fire impacts on natural urban ecosystems. Predicting future regimes requires an understanding of how temperature precipitation interact control activity. Inevitably this historical analyses that relate annual burning climate variation. Fuel structure plays a critical role determining which climatic parameters are most influential here, by focusing the diversity ecosystems California, we illustrate some principles need be recognized predicting regimes. Spatial scale analysis important large heterogeneous landscapes may not fully capture accurate relationships between fires. Within climatically homogeneous subregions, montane forested show strong fluctuations with area burned; however, strongly seasonal dependent; e.g., winter temperatures very little or no effect but spring summer critical. models predict changes needed improve regime projections. does appear major determinant activity all landscapes. Lower elevations lower latitudes increase hotter drier conditions. On these usually limiting fires vegetation types ignition-limited. Moreover, because they closely juxtaposed human habitations, more controlled other direct anthropogenic impacts. rocket science; it far complicated than that. change relevant landscapes, where relevant, relationship will due effects trajectories, well feedback processes distribution, plus policy manage

Language: Английский

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