Ecohydrology最新文献

{"title":"Modelling the Influence of Vegetation on the Stochastic Dynamics of Coastal Dunes","authors":"Kiran Adhithya Ramakrishnan,&nbsp;Orencio Duran Vinent","doi":"10.1002/eco.2766","DOIUrl":"https://doi.org/10.1002/eco.2766","url":null,"abstract":"<div>\u0000 \u0000 <p>Coastal dunes are the highest natural features on a barrier island, where they protect beach communities, infrastructure and low-energy back-barrier ecosystems from flooding and erosion during storms and other high-water events. Their formation, and poststorm recovery, is a result of a subtle competition between the physical and biological processes controlling the initial stages of dune growth. Vegetation colonises a barren back-beach and traps wind-driven (aeolian) sand to form dunes, but at low enough elevation, plants can be eroded by water-driven transport during random flooding events, which slows down or prevents dune formation. This competition has been previously investigated using both process-based and analytical models. However, the effect of finite vegetation recovery times together with the precise stochastic nature of flooding events has not been taken into account before. A recent stochastic dune model assumed that vegetation grows and recovers instantaneously, whereas an existing process-based dune model, the Coastal Dune Model (CDM), did not properly resolve the stochastic flooding events. Here, we address this knowledge gap by adding a much more realistic description of high-water events of the stochastic model to CDM and investigate the role of vegetation growth and recovery times in dune formation. We first replicate the stochastic model predictions assuming instantaneous vegetation growth. We then define the vegetation colonisation time and relate it to the initial dune formation time. Since dune formation requires the presence of vegetation, a finite colonisation time leads to an expected lag in dune formation and recovery. Depending on the competition between vegetation growth and aeolian erosion, we find that dune dynamics can be divided into two regimes: one with a stable (static) vegetated dune and another one with a mobile, partially vegetated, dune propagating landward. Within the stable dune regime, the influence of vegetation on dune recovery is solely controlled by the relation between the vegetation colonisation time, the dune growth time after plant colonisation and the return period of high-water events flooding the back-beach. We introduce two control parameters based on these times and use them to describe a simplified phase space of the dune state. We then find a simple analytical expression for the transition from a ‘high’ state with mature dunes to a ‘low’ state devoid of dunes based on the competition between dune recovery time controlled by vegetation and the flooding frequency. Finally, we use the transition threshold to propose a vulnerability indicator for dune recovery as the minimum elevation after an overwash required for vegetation to recover.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Turbulent Flow Structure in a Symmetric Compound Channel With Flexible Emergent Vegetation Over Floodplains","authors":"Laxman V. Rathod,&nbsp;P. V. Timbadiya,&nbsp;Bandita Barman","doi":"10.1002/eco.2763","DOIUrl":"https://doi.org/10.1002/eco.2763","url":null,"abstract":"<div>\u0000 \u0000 <p>An experimental study was conducted to investigate the influence of emergent flexible floodplain (FP) vegetation on the turbulent flow structure in a symmetric compound channel. The foliage patterns of the artificial flexible vegetation used in our experimental sets were as follows: no vegetation, homogeneous grass and shrubs and a heterogeneous mixture of grass and shrubs arranged in a staggered pattern. An analysis of the velocity data revealed an observable decrease in velocity across the FP owing to the presence of vegetation and a significant increase in the mean streamwise velocity in the middle of the main channel (MC). The effect was higher in the case of heterogeneous vegetation. This indicates that a heterogeneous mixture of grass and shrubs provides a higher resistance than homogeneous grass or shrubs separately. It enhances the lateral momentum transfer owing to the fast-moving MC flow and low-velocity FP flow. The turbulent kinetic energy (TKE) and Reynolds shear stress (RSS) were higher in the vegetative MC than in the non-vegetative channel. In contrast, these were lower in the vegetative FP than in the non-vegetative FP. An octant analysis showed a decrease in ejection events in both FP and MC and an increase in sweep events in the MC owing to FP vegetation. The reduction in ejection events contributed to the breakdown of vortices and reduced turbulence. Meanwhile, the increase in sweep events enhanced the sediment entrainment. These results indicate that heterogeneous FP vegetation significantly affects the flow dynamics and turbulent parameters in a compound channel.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Pond System on Surface Temperature and Urban Cooling","authors":"Quang-Viet Nguyen,&nbsp;Viet Huong-Do Thi","doi":"10.1002/eco.2760","DOIUrl":"https://doi.org/10.1002/eco.2760","url":null,"abstract":"<div>\u0000 \u0000 <p>A greener city is an emerging tendency for urban managers to deal with ongoing urbanization and climate change. One natural-based solution gaining prominence is the incorporation of blue spaces, such as ponds, to regulate microclimates and alleviate urban heat island effects. The study focuses on investigating the inherent properties of a pond system, including morphological characteristics and environmental indicators that influence pond surface temperature (PST). Additionally, the study explores the cooling effects of the pond system, examining both the extent and intensity of cooling. To conduct this analysis, data on land surface temperature and land use/land cover types are extracted from Landsat-8 and Sentinel-2 images, respectively. The study, encompassing 709 ponds, reveals that the perimeter edge predominantly influences the PST (<i>β</i> = −0.857) while the area and shape ratio moderately affect the PST (<i>β</i> = 0.259 and 0.296, respectively). Moreover, mean elevation demonstrates a reducing effect on the PST (<i>β</i> = −0.214). The study utilizes polynomial regression and the concept of the first turning point to identify two critical cooling indicators of the pond system. Consequently, the cooling extent is defined at 140 m and the intensity at 2.7°C. These indicators offer valuable insights into the inherent properties influencing PST and contribute to the understanding of cooling mechanisms in the pond system. The implications of these findings extend to urban planning, particularly in the realm of blue space design, where the evidence presented can guide strategies to tackle the impacts of urbanization and climate change.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Supply–Demand Synergy Assessment of the Water–Energy–Food Nexus in the Hanjiang River Basin Under Future Land Scenarios","authors":"Weiqi Yuan,&nbsp;Hongxiang Wang,&nbsp;Wenxian Guo","doi":"10.1002/eco.2762","DOIUrl":"https://doi.org/10.1002/eco.2762","url":null,"abstract":"<div>\u0000 \u0000 <p>Understanding the supply–demand matching and trade-offs of ecosystem services is crucial for formulating land use policies. However, there remains a lack of clear understanding on how to coordinate the supply–demand mismatch of ecosystem services under different future scenarios. In examining the Hanjiang River Basin (HJRB), this study utilizes the PLUS and InVEST models to evaluate present spatiotemporal changes in water yield (WY), carbon storage (CS) and food provision (FP) within the water–energy–food nexus context. It further explores the spatiotemporal patterns and correlation analysis of the WEF nexus across varying scenarios. The findings suggest the following: (1) Between 2000 and 2020, there was a notable rise in both forest and built-up land. Compared to the year 2020, in the cropland protection scenario (CPS), cropland increased by 2.19%. In the ecological protection scenario (EPS), forest area increased significantly by 4.06%. In the natural growth scenario (NGS), the largest increase was observed in construction land, which expanded by 26.31%. (2) Land use and cover change (LUCC) has a limited impact on the WEF nexus supply, accounting for about 1%. From 2000 to 2020, both WY and CS's ESDR exhibited a ‘decrease-followed-by-increase’ trend, while FP's ESDR gradually increased, with only the mismatched area between supply and demand for WY decreasing. (3) Unlike the grid scale, the WEF nexus correlation at the county/city scale has significantly increased, and intense LUCC will alter the synergy and trade-offs within the WEF nexus. Additionally, there exists a pronounced spatial misalignment between CS and WY. Therefore, this study can provide a comprehensive reference for land use planning aimed at achieving the coordinated development of humans and nature.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detecting Forest-Wetland Changes in Northwestern Canada's Discontinuous Permafrost Region Using Landsat Trend Analysis","authors":"Olivia Carpino,&nbsp;Stephanie Wright,&nbsp;Jiaao Guo,&nbsp;Jurjen van der Sluijs,&nbsp;Ryan Connon,&nbsp;William Quinton","doi":"10.1002/eco.2759","DOIUrl":"https://doi.org/10.1002/eco.2759","url":null,"abstract":"<p>Rapid circumpolar warming has led to accelerated permafrost thaw that has induced extensive landscape change in northwestern Canada. In northwestern Canada's discontinuous permafrost zone, forest-dominated peatland landscapes, which were largely underlain by permafrost, are transitioning to treeless, wetland-dominated landscapes that are permafrost-free. Previous studies that focused on permafrost thaw-induced landscape transitions in boreal peatlands have used aerial photographs and/or high-resolution satellite images acquired only at end nodes or decadal intervals across each study's time frame. This study uses a dense near-annual resolution of mosaicked Landsat imagery to determine if changes can be detected to peatland landscapes over a 37-year period for 10 study sites across a latitudinal transect through the southern Northwest Territories and northern British Columbia, Canada. Tasselled cap (TC) transformations (brightness, greenness and wetness) are applied to the Landsat imagery and compared with forest cover changes (1970–2010) derived from high resolution areal imagery to visually assess the performance of this method in revealing forest-wetland changes driven by permafrost thaw. While methods based on Landsat TC trends have been successfully applied in northwestern Canada with forest fires and mass wasting, this study explores pixel trends as well as time series for more gradual thaw-induced changes across peat plateaus, collapse scar wetlands and channel fens. This study demonstrates that TC transformations can be used to determine differing brightness, greenness and wetness trajectories for individual landcovers within permafrost peatlands (i.e., forest, collapse scar wetland and fen). However, the subtle and non-monotonic landcover and hydrologic changes resulting from decades of permafrost thaw can be more challenging to detect. At the regional scale, widespread spectral greening was observed that was not solely indicative of forest cover or density increases, whereby TC trends were not consistent with expected permafrost thaw-induced landscape changes. This work suggests that TC transformations may be limited in use for assessing broad-scale effects of gradual permafrost thaw processes that occur at high temporal and spatial frequencies.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eco.2759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing Temporal Variability of Turbidity in Pampean Shallow Lakes (Argentina) Using Three Decades of Landsat Imagery","authors":"Maira Patricia Gayol,&nbsp;María Laura Sánchez,&nbsp;Ana Inés Dogliotti","doi":"10.1002/eco.2765","DOIUrl":"https://doi.org/10.1002/eco.2765","url":null,"abstract":"<div>\u0000 \u0000 <p>The Pampean region (Argentina) encompasses thousands of permanent shallow lakes, which can be either in turbid or clear water regimes. The intensification of human activities in this region has led to a general deterioration of their water quality. Remote sensing allows the monitoring of water quality in lakes over large areas and extended periods. The objectives of this study were to analyse temporal variations in turbidity in six shallow lakes using Landsat satellite data (5-TM, 7-ETM+ and 8-OLI) for the period 1987–2020 and to evaluate the impact of total crop area and El Niño Southern Oscillation (ENSO) events on these variations. A semi-analytical turbidity algorithm using reflectance in the red and near-infrared bands was tested against in situ turbidity measurements. The Floating Algal Index (<i>FAI</i>) was used to discard pixels with above-water vegetation. The best performance of the algorithm was achieved using only the near-infrared band for the four turbid lakes, and the red band for the two clear lakes. High vegetation coverage in clear lakes prevented the estimation of the complete turbidity series. A significant positive turbidity trend was observed for turbid lakes during the 2000s, coinciding with a sharp increase in cultivated area. Regarding ENSO, a statistically significant relationship with turbidity was observed for the entire period in one lake, but turbidity peaks coincided with La Niña events in all lakes. This study emphasizes the utility of remote sensing in complementing field studies and thus monitoring regional changes in aquatic systems over long periods.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Continuous Stem Water Potential Measurements of a Diffuse-Porous Tree Species Offer New Insights Into Tree Water Relations","authors":"Simon Haberstroh,&nbsp;Fabio Scarpa,&nbsp;Stefan Seeger,&nbsp;Andreas Christen,&nbsp;Christiane Werner","doi":"10.1002/eco.2761","DOIUrl":"https://doi.org/10.1002/eco.2761","url":null,"abstract":"<p>Water potential is a crucial parameter for assessing tree water status and hydraulic strategies. However, methods for measuring water potential, such as the Scholander pressure chamber, are destructive, discontinuous and difficult to perform in tall forests. Consequently, important dynamics in water potentials, particularly during short-term drought, are difficult to capture. Recent advancements have introduced low-maintenance sensors capable of measuring continuous, high-resolution stem water potentials.</p><p>We evaluated these sensors in a temperate, diffuse-porous species (<i>Carpinus betulus</i>) over a growing season marked by dry-down periods and heat. Measurements of leaf water potential, sap flow and environmental factors (air temperature, vapour pressure deficit and soil water content) were conducted. Midday stem water potentials of <i>C. betulus</i> reached minimum values of −3.39 ± 0.10 MPa and exhibited pronounced seasonal fluctuations, mirroring changes in environmental conditions and sap flow.</p><p>Stem water potentials correlated well with Scholander-type measurements during predawn (<i>R</i>² = 0.98) but demonstrated an offset in absolute values during midday (<i>R</i>² = 0.71) and diurnal measurements. Minimum stem water potentials and maximum sap flow in the stem expressed a time lag and showed a distinct hysteresis. In this first assessment, the agreement with Scholander-type measurements, sap flow and environmental parameters suggests the tested water potential sensors yield reliable data, especially during predawn, but need further validation during midday conditions. If applicable to other tree species, these sensors could significantly advance our understanding of tree water relations and their role in forest drought responses.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eco.2761","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiscale Nonlinear Response of Extreme Meteorological–Hydrothermal Events in the Upper Reaches of the Yangtze River","authors":"Long Yu,&nbsp;Wenxian Guo,&nbsp;Huan Yang,&nbsp;Yanhua Li,&nbsp;Hongxiang Wang","doi":"10.1002/eco.2756","DOIUrl":"https://doi.org/10.1002/eco.2756","url":null,"abstract":"<div>\u0000 \u0000 <p>Under the backdrop of climate warming, the outbreak of short-term extreme heat events can easily lead to irreversible changes in aquatic ecosystems. Delving into their intrinsic driving mechanisms and nonlinear characteristics is key to preventing natural disasters. This study, focusing on the upper Yangtze River as the research area, constructs a joint copula function model to analyze the joint occurrence probability and return period of extreme meteorological heat events. Through the bivariate cross–wavelet transform method, the study explores the multiscale dynamic response relationships and phase characteristics of extreme meteorological–hydrothermal events in the upper Yangtze River. Furthermore, a joint multifractal model of nonlinear responses for extreme meteorological–hydrothermal events was established. The results indicate that extreme high-heat meteorological events in the upper Yangtze River tend to occur more frequently and severely, with duration–kurtosis events likely to coincide within a 2-year return period, as well as high-intensity low-frequency high-heat duration–severity events occurring simultaneously. Overall, before 2005, extreme high-hydrothermal events exhibited phase characteristics lagging behind meteorological changes, which then shifted from lag to lead. Under three scenarios of change, meteorological–hydrothermal events exhibit a clear nonlinear response relationship. Apart from duration, severity and kurtosis all show significant nonlinear relationships.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecohydrological Conditions in Urban Wells and Patterns of Invertebrate Fauna Distribution (Kraków, Poland)","authors":"Elzbieta Dumnicka,&nbsp;Joanna Galas,&nbsp;Mariola Krodkiewska,&nbsp;Agnieszka Pociecha,&nbsp;Mirosław Żelazny,&nbsp;Anna Biernacka,&nbsp;Łukasz Jelonkiewicz","doi":"10.1002/eco.2757","DOIUrl":"https://doi.org/10.1002/eco.2757","url":null,"abstract":"<div>\u0000 \u0000 <p>Groundwaters are threatened by various kinds of contaminants, especially in cities. The results of an ecohydrological analysis (hydrobiological, chemical and geological) conducted in 91 urban wells in Kraków showed their effect on fauna composition and abundance. In 74 wells, the presence of invertebrates, chiefly characteristic for surface water, as well as Collembola was stated. Copepoda were found in 40 wells, whereas Nematoda, Annelida and Diptera larvae were found at over a dozen sites. Microturbellaria, Rotifera, Ostracoda and Amphipoda were present in only a few wells. The aim of this article was to find the patterns of invertebrates' distribution in the wells to further understanding of their relationships with groundwater chemistry and the geological background. This is especially important in light of the anthropogenic pollution occurring in wells and the desired attainment of the good ecological status of groundwater. According to Student's <i>t</i>-test, the presence of fauna did not depend on the studied environmental factors, whereas Pearson correlations showed that total fauna abundance and Copepoda occurrence positively correlated with water temperature which was higher in the city in comparison to that in rural wells. The value of the Shannon–Wiener index and the number of taxa negatively correlated with the well's depth. High variations of water chemical parameters caused by mixed lithology and hydrogeology as well as spotty contamination may affect the occurrence of fauna.</p>\u0000 </div>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"18 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Patterns and drivers of cottonwood mortality in the middle Rio Grande, New Mexico, USA","authors":"Hannah Varani,&nbsp;Ellis Q. Margolis,&nbsp;Esteban H. Muldavin,&nbsp;William T. Pockman","doi":"10.1002/eco.2692","DOIUrl":"https://doi.org/10.1002/eco.2692","url":null,"abstract":"<p>Riparian ecosystems are some of the most valuable and vulnerable on the planet. Riparian tree mortality is increasing in the western United States, where altered streamflows are combining with warming climate. Between 2011 and 2013, one third of an extensive stand of <i>Populus deltoides</i> var. <i>wislizeni</i> (Rio Grande cottonwood) died along the middle Rio Grande on the Pueblo of Santa Ana in New Mexico. Mortality coincided with a severe drought that followed a decade of decreasing streamflow, but it was heterogeneous, with adjacent patches of dead and live trees. The goal of this research was to determine the drivers of mortality to provide insights into future risks of die-off and potential management interventions. We compared tree age, competition, tree-ring widths, sediment particle size and climate influences between live and dead forest patches in a nested plot design. Live and dead trees had similar age, stand density and particle sizes of shallow sediments. Tree-ring widths had the highest correlations with July–September streamflow (1932–2013). All trees had declining ring growth since 1992, coinciding with declining late summer streamflow. An accelerated decline in growth began in 2002, corresponding to recent warmer droughts. Trees that died had lower ring growth 3 years prior to death and in the mid-1900s. Dead trees also had coarser deep sediments 2.4–3.7 m below ground, suggesting that reduced water holding capacity was an important factor for mortality. Water management to increase streamflow during the late summer, especially during times of extended drought, could reduce mortality risk in the face of projected increasingly warm droughts.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":"17 8","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143121238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}