Response of stem sap flow and leaf photosynthesis in Tamarix chinensis to soil moisture in the Yellow River Delta, China

Xia, Jiangbao; Zhao, Zhuofeng; Sun, Jingkuan; Liu, J. T.; Zhao, Yanyun

doi:10.1007/s11099-016-0651-6

Cited by 14 publications

(40 citation statements)

References 30 publications

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“…We started a first 13 C-labeling campaign at the end of August 2017 after >2 wk of almost no rainfall (<0.9 mm) (SI Appendix, Fig. S2A), when soil water content in the nonirrigated plots approached values <15% below 2-cm soil depth (SI Appendix, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Taking advantage of a long-term (15-y) precipitation manipulation (irrigation) experiment in a dry inner-Alpine valley in Switzerland (25) and the natural fluctuations of drought and rainfall, we studied the effects of drought and intermittent drought release by a precipitation event on C allocation in a 100-y-old Scots pine forest. We applied 13 CO 2 pulse labeling to 10 mature trees and traced the flux of newly assimilated C from needles into branch, trunk, root, and soil microbial biomass pools and into above-and belowground respiration (Fig. 1).…”

Section: Significancementioning

confidence: 99%

“…We investigated the impact of drought and drought release on C allocation in a 100-y-old Scots pine forest. We applied 13 CO 2 pulse labeling to naturally dry control and long-term irrigated trees and tracked the fate of the label in above-and belowground C pools and fluxes. Allocation of new assimilates belowground was ca.…”

mentioning

confidence: 99%

“…3 and 11). 2) There are indeed many studies that address small but realistic variations in soil moisture but most of these have solely focused on aboveground responses of tree C relations (12,13) or integrated whole-ecosystem CO 2 exchange impacts (14,15) while not taking into account interactions and linkages between shoots and roots and the associated rhizosphere microbiome. For juvenile trees, though, C transfer between shoots, roots, and rhizosphere microbes was found to be crucial for both plant and microbial functioning under stress (9).…”

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confidence: 99%

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Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation

Joseph

Gao

Backes

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Drought alters carbon (C) allocation within trees, thereby impairing tree growth. Recovery of root and leaf functioning and prioritized C supply to sink tissues after drought may compensate for drought-induced reduction of assimilation and growth. It remains unclear if C allocation to sink tissues during and following drought is controlled by altered sink metabolic activities or by the availability of new assimilates. Understanding such mechanisms is required to predict forests’ resilience to a changing climate. We investigated the impact of drought and drought release on C allocation in a 100-y-old Scots pine forest. We applied 13CO2 pulse labeling to naturally dry control and long-term irrigated trees and tracked the fate of the label in above- and belowground C pools and fluxes. Allocation of new assimilates belowground was ca. 53% lower under nonirrigated conditions. A short rainfall event, which led to a temporary increase in the soil water content (SWC) in the topsoil, strongly increased the amounts of C transported belowground in the nonirrigated plots to values comparable to those in the irrigated plots. This switch in allocation patterns was congruent with a tipping point at around 15% SWC in the response of the respiratory activity of soil microbes. These results indicate that the metabolic sink activity in the rhizosphere and its modulation by soil moisture can drive C allocation within adult trees and ecosystems. Even a subtle increase in soil moisture can lead to a rapid recovery of belowground functions that in turn affects the direction of C transport in trees.

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Section: Resultsmentioning

confidence: 99%

Section: Significancementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation

Joseph

Gao

Backes

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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“…The National Aeronautics and Space Administration (NASA) Earth Ventures 1 Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS; https://airmoss.jpl.nasa.gov/) is a new airborne P-band synthetic aperture radar (SAR) designed to provide direct retrievals of root-zone soil moisture (RZSM) up to 120 cm in depth (depth of penetration varies depending on the amount of vegetation cover) using active remote sensing (Tabatabaeenejad et al, 2015). As its name implies, RZSM is a critical soil moisture state variable that influences plant functioning, including photosynthesis (Xia et al, 2017), ecosystem respiration (Flanagan & Johnson, 2005), and soil respiration (Ito & Ishida, 2016).…”

Section: Introductionmentioning

confidence: 99%

The Sensitivity of North American Terrestrial Carbon Fluxes to Spatial and Temporal Variation in Soil Moisture: An Analysis Using Radar‐Derived Estimates of Root‐Zone Soil Moisture

et al. 2019

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This study examines the impact of variation in root-zone soil moisture (RZSM), a key component of the Earth's hydrologic cycle and climate system, on regional carbon fluxes across seven North American ecosystems. P-band synthetic aperture radar-derived RZSM estimates were incorporated into the ecosystem demography (ED2) terrestrial biosphere model through a model-data blending approach. Analysis shows that the model qualitatively captures inter-daily and seasonal variability of observed RZSM at seven flux tower sites (r = 0.59 ± 0.26 and r = 0.70 ± 0.22 for 0-10 and 10-40 cm of soil layers, respectively; P < 0.001). Incorporating the remotely sensed RSZM estimates increases the accuracy (root-mean-square deviations decrease from 0.10 ± 0.07 and 0.09 ± 0.06 m 3 ·m −3 to 0.08 ± 0.05 and 0.07 ± 0.03 m 3 ·m −3 for 0-10 and 10-40 cm of soil layers, respectively) of the model's RZSM predictions. The regional carbon fluxes predicted by the native and RZSM-constrained model were used to quantify sensitivities of gross primary productivity, autotrophic respiration (R a ), heterotrophic respiration (R h ), and net ecosystem exchange to variation in RZSM. Gross primary productivity exhibited the largest sensitivity (6.6 ± 10.7 kg·cm −2 ·year·θ −1 ) followed by R a (2.9 ± 7.3 kg·cm −2 ·year −1 ·θ −1 ), R h (2.6 ± 3.1 kg·cm −2 ·year −1 ·θ −1 ), and net ecosystem exchange (−1.7 ± 7.8 kg·cm −2 ·year −1 ·θ −1 ). Analysis shows that these carbon flux sensitivities varied considerably across regions, reflecting influences of canopy structure, soil properties, and the ecophysiological properties of different plant functional types. This study highlights (1) the importance of improved terrestrial biosphere model predictions of RZSM to improve predictions of terrestrial carbon fluxes, (2) a need for improved pedotransfer functions, and (3) improved understanding of how soil characteristics, climate, and vegetation composition interact to govern the responses of different ecosystems to changing hydrological conditions.

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Salinity induced alterations in photosynthetic and oxidative regulation are ameliorated as a function of salt secretion

Hussain

Feng

et al. 2021

J Plant Res

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Response of stem sap flow and leaf photosynthesis in Tamarix chinensis to soil moisture in the Yellow River Delta, China

Cited by 14 publications

References 30 publications

Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation

Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation

The Sensitivity of North American Terrestrial Carbon Fluxes to Spatial and Temporal Variation in Soil Moisture: An Analysis Using Radar‐Derived Estimates of Root‐Zone Soil Moisture

Salinity induced alterations in photosynthetic and oxidative regulation are ameliorated as a function of salt secretion

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