Effects of global greening phenomenon on water sustainability

Liu, Yujiao; Chai, Yuanfang; Yao, Yulong; Huang, Yusi; Yang, Yixin; Zhu, Boyuan; Lou, Dan; Li, Yitian; Shi, Dawei; Ullah, Waheed

doi:10.1016/j.catena.2021.105732

Cited by 14 publications

(6 citation statements)

References 59 publications

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“…We obtained root‐zone soil moisture (SM) data from the dataset of GLEAM v.3.5a (https://www.gleam.eu/; Martens et al, 2017; Miralles et al, 2010). This dataset has a daily temporal resolution and a spatial resolution of 0.25°, and it has been widely used to investigate the spatial variability and trends in soil water contents (Immerzeel et al, 2020; Liu et al, 2022; Schwingshackl et al, 2017). The mean soil moisture during the growing season and pre‐growing season was calculated accordingly for each tree at each site.…”

Section: Methodsmentioning

confidence: 99%

Photoperiod drives cessation of wood formation in northern conifers

Camarero

et al. 2023

Global Ecol Biogeogr

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Aims Shifts in xylem phenology directly determine the forest capacity for carbon sequestration. However, a systematic understanding of the spatial patterns and the underpinning drivers in determining the cessation of wood formation (Ccw) is lacking at a pan‐continental scale. Here, we addressed this knowledge gap by compiling a new dataset of multiple xylem phenology timings for northern conifers. Locations Sixty‐two study sites, Northern Hemisphere (25–55° N). Time period 2003–2018 (16 years). Taxa Thirty‐three conifer species. Methods A generalized additive model was fitted to characterize the latitudinal pattern in Ccw. Structural equation modelling and a linear mixed‐effects model were applied to determine the main drivers underlying the latitudinal pattern in Ccw. Results The Ccw followed a flat S‐shaped pattern with increasing latitude. Photoperiod was the dominant determinant of the latitudinal pattern of Ccw, and a longer photoperiod was associated with an earlier Ccw. Both mean growing‐season temperature and total growing‐season precipitation exhibited significantly positive relationships to the cessation of cell elongation and thus the Ccw across all study sites. In arid regions, the pre‐growing‐season temperature had a significantly negative effect on Ccw. In humid regions, Ccw was positively affected by the mean growing‐season temperature. The onset of wood formation showed significantly positive coupling with Ccw at arid sites but not at humid sites. Early successional species were sensitive to hydrothermal variations during the pre‐growing season. Main conclusions We reveal the dominant role of photoperiod in determining the cessation of wood formation for northern conifers and highlight differentiated interactive effects between photoperiod and seasonal climatic factors and the preceding xylem phenophases in determining Ccw among ecoregions and tree species. These insights provide evidence to reduce uncertainty in prediction of the forest carbon uptake potential and the consequent biophysical feedbacks of northern forests.

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Section: Methodsmentioning

confidence: 99%

Photoperiod drives cessation of wood formation in northern conifers

Camarero

et al. 2023

Global Ecol Biogeogr

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“…Water availability is characterized by subsurface water supply capacity in local precipitation redistribution to vegetation growth. The precipitation vegetation drought index (PVDI) is an effective index generated from optical remote sensing imagery to monitor regional subsurface stored precipitation available to vegetation growth (Zhu et al 2021, Liu et al 2022. Similar vegetation is supported by different precipitation supply levels, indicating a difference in the available water that can be redistributed to vegetation.…”

Section: Establishing the Relationship Between The Soil Effect And Wa...mentioning

confidence: 99%

Soil coarsening alleviates precipitation constraint on vegetation growth in global drylands

Zhu

Liu

et al. 2022

Environ. Res. Lett.

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Drought is an important and complicated topic and the specific variables considered to represent climate drought stress and plant water stress often generate highly contradictory conclusions. As the junction of atmosphere and biosphere, soil may play an important role of separating climatic drought stress from vegetation water constraint. Here, we conduct a comprehensive evaluation of water constraint on vegetation growth in global drylands by separating precipitation constraint and soil moisture constraint. Although the global drylands are characterized by low precipitation supply capacity, there are indeed a large number of grids showing decoupled water availability for plants from variability of precipitation, with the ratios of 47% 64% and 61% for arid semiarid and subhumid regions, respectively. Soil properties, instead of climate and root length regimes, can explain the water constraint divergence between precipitation and soil moisture. Sand content emerged as the most significant soil property to weaken the precipitation constraint on vegetation growth, with a 1% increase in the sand content of global arid, semiarid, and dry subhumid regions increasing an average of 0.31, 0.45, and 0.04 gC m−2 yr−1 GPP deviation from the theoretical GPP determined by precipitation, respectively. This study provides new insight into how soil texture interacts with precipitation constraints to influence plant available water in global drylands, which contributes to assessing ecological drought in global drylands.

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“…Increase in atmospheric CO 2 concentration from fossil fuel combustion and deforestation can enhance plant photosynthetic carbon fixation rates and terrestrial biomass production (Clark et al., 2020; Liu et al., 2022; Morton et al., 2009; Skinner et al., 2018), which is the main driving factor of vegetation greening phenomenon (Piao et al., 2020). Anthropogenic carbon emissions have been partly absorbed by the terrestrial biosphere, making it a critical component of the carbon sink (Xu et al., 2019), especially in the Northern Middle and High Latitudes.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and drivers of vegetation productivity sensitivity to increasing CO₂ at Northern Middle and High Latitudes

Chai,

2024

Ecology and Evolution

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Understanding and accurately predicting how the sensitivity of terrestrial vegetation productivity to rising atmospheric CO2 concentration (β) is crucial for assessing carbon sink dynamics. However, the temporal characteristics and driving mechanisms of β remain uncertain. Here, observational and CMIP6 modeling evidence suggest a decreasing trend in β at the Northern Middle and High Latitudes during the historical period of 1982–2015 (−0.082 ± 0.005% 100 ppm−1 year−1). This decreasing trend is projected to persist until the end of the 21st century (−0.082 ± 0.005% 100 ppm−1 year−1 under SSP370 and −0.166 ± 0.006% 100 ppm−1 year−1 under SSP585). The declining β indicates a weakening capacity of vegetation to mitigate warming climates, posing challenges for achieving the temperature goals of the Paris Agreement. The rise in vapor pressure deficit (VPD), that triggers stomata closure and weakens photosynthesis, is considered as the dominated factor contributing to the historical and future decline in β, accounting for 62.3%–75.2% of the effect. Nutrient availability and water availability contribute 15.7%–21.4% and 8.5%–16.3%, respectively. These findings underscore the significant role of VPD in shaping terrestrial carbon sink dynamics, an aspect that is currently insufficiently considered in many climate and ecological models.

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Effects of global greening phenomenon on water sustainability

Cited by 14 publications

References 59 publications

Photoperiod drives cessation of wood formation in northern conifers

Photoperiod drives cessation of wood formation in northern conifers

Soil coarsening alleviates precipitation constraint on vegetation growth in global drylands

Characteristics and drivers of vegetation productivity sensitivity to increasing CO₂ at Northern Middle and High Latitudes

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Effects of global greening phenomenon on water sustainability

Cited by 14 publications

References 59 publications

Photoperiod drives cessation of wood formation in northern conifers

Photoperiod drives cessation of wood formation in northern conifers

Soil coarsening alleviates precipitation constraint on vegetation growth in global drylands

Characteristics and drivers of vegetation productivity sensitivity to increasing CO2 at Northern Middle and High Latitudes

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Characteristics and drivers of vegetation productivity sensitivity to increasing CO₂ at Northern Middle and High Latitudes