Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China

Liu, Peng; Zha, Tianshan; Jia, Xin; Black, T. Andrew; Jassal, Rachhpal S.; Ma, Jingyong; Bai, Yujie; Wu, Yajuan

doi:10.1007/s10021-019-00379-5

Cited by 33 publications

(27 citation statements)

References 42 publications

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“…The results parallel the findings of Liu, Zha, et al (2019); Liu, Shang, et al (2019) and Flanagan et al (2002) where both spring and summer drought reduced GPP in a semi-arid shrubland ecosystem in northwest China and a northern temperate grassland near Lethbridge, Alberta, Canada respectively. In general, a decrease in GPP after drought could be attributed to two mechanisms: (a) a decrease in total leaf area (community cover or NDVI) and/or (b) a decrease in photosynthetic rates per unit leaf area (Reynolds et al, 2015;Sloat et al, 2015;Xia et al, 2015).…”

Section: Gross Ecosystem Primary Productivitysupporting

confidence: 83%

“…The sensitivity of GPP and ER to water availability is related to the timing of drought (Liu, Zha, et al, 2019;Liu, Shang, et al, 2019).…”

Section: Sensitivity Of Carbon Fluxmentioning

confidence: 99%

“…Arid and semi‐arid grasslands occupy about 30% of the Earth's land surface, contributing the greatest fraction to the global carbon (C) balance (Biederman et al., 2016; Liu, Zha, et al., 2019; Liu, Shang, et al., 2019; Scott et al., 2015). Climate changes are expected to alter precipitation regimes, changing the frequency, severity and timing of drought occurrence (Peng et al., 2013; Ru et al., 2019; Sala et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Climate changes are expected to alter precipitation regimes, changing the frequency, severity and timing of drought occurrence (Peng et al., 2013; Ru et al., 2019; Sala et al., 2015). Changes in both drought magnitude and timing can significantly influence C fluxes, especially in arid and semi‐arid grasslands characterized by limited water availability (Feng et al., 2013; Harper et al., 2005; Liu, Zha, et al., 2019; Liu, Shang, et al., 2019; Yang & Zhou, 2013). However, little is known about the general patterns and underlying mechanisms controlling C cycling responses to drought severity and timing (Xie et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semi‐arid grassland

Yang

Wei

et al. 2021

Journal of Applied Ecology

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Section: Gross Ecosystem Primary Productivitysupporting

confidence: 83%

“…The sensitivity of GPP and ER to water availability is related to the timing of drought (Liu, Zha, et al, 2019;Liu, Shang, et al, 2019).…”

Section: Sensitivity Of Carbon Fluxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semi‐arid grassland

Yang

Wei

et al. 2021

Journal of Applied Ecology

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“…By contrast, the effects of dry events on GPP were weak in forest ecosystems of northern China because of their high resilience to drought (Yuan et al, 2014). The effects of drought on GPP varied among dry events occurring in different years in a semi‐arid shrubland in northwestern China (Liu et al, 2019). Currently the mechanism by which plant trait diversity (e.g., water transport strategies) regulates the response of ecosystem carbon flux to drought events in different climatic regions remains unclear, impeding clarification of future impacts of climate change on ecosystem functions as well as simulation of feedback from the hydrological and carbon cycles on climate (Kannenberg et al, 2020; Merganicova et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Plant Hydraulic Stress Strategy Improves Model Predictions of the Response of Gross Primary Productivity to Drought Across China

et al. 2020

JGR Atmospheres

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The response of the terrestrial carbon cycle to droughts, which have recently increased in incidence and severity, is a hot topic in research, but the role played by vegetation water use strategies remains unclear. Both the soil moisture stress (SMS) and plant hydraulic stress (PHS) strategies are used in land surface models, but their performance in simulating the terrestrial carbon cycle and its response to droughts in various climatic zones remains uncertain. In this study, we used Community Land Model Version 5 to simulate gross primary productivity (GPP) across four different climatic subregions of China during 2000-2015 to investigate the roles played by PHS and SMS in the response of GPP to dry events and dry or rainy years in various climate zones. Simulated GPP with the two strategies were overestimated by 2.0-2.3% for the entire China compared to Moderate Resolution Imaging Spectroradiometer (MODIS) data. GPP simulated using PHS configuration fit eddy covariance and MODIS data better than that obtained using SMS across China, except for the Qinghai-Tibet Plateau. PHS increased simulated GPP by 0.10-0.63 g C m −2 day −1 during dry events across different climatic regions because of root hydraulic lift but decreased GPP by 0.37-0.45 g C m −2 day −1 during growing season in the humid southeastern region because of high atmospheric vapor pressure deficit and root hydraulic descent. Simulations forced by data collected locally in China performed better than those forced by CRUNCEP7 global data at the site but worse at the regional scale, in particular for the Qinghai-Tibet Plateau.

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Drought occurrence and time‐dominated variations in water use efficiency in an alpine meadow on the Tibetan Plateau

et al. 2021

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Under global climate change, more frequent and widespread droughts have dramatic impacts on the water and carbon cycles. Water use efficiency (WUE) is a commonly used indicator reflecting the trade‐off relationship between carbon sequestration and water consumption. Therefore, this study aims to clarify the variations in WUE and the effects of drought on WUE in sensitive alpine meadows on the Tibetan Plateau. Based on 6‐year (2013–2018) continuous carbon and water flux data observed by the eddy covariance system, WUE was calculated by gross ecosystem productivity (GEP)/evapotranspiration (ET). WUE followed a unimodal variation with time during growing seasons in the years without droughts. However, drought disrupted this pattern by its effects on the coupled relationship between carbon and water fluxes. Specifically, droughts showed divergent effects on WUE variations in different periods of the growing seasons. In the early‐growing seasons, droughts induced an increase in WUE. During this period, WUE was mainly regulated by temperature and leaf area index (LAI), and the GEP was low due to the smaller LAI. Therefore, the drought‐induced reduction in GEP was less than that in ET; thus, WUE increased. In the mid‐growing seasons, droughts depressed WUE. WUE was dominated by water conditions and the LAI during this period. When drought occurred, GEP decreased faster than ET, and hence, WUE decreased. In the late‐growing season, WUE was mainly driven by temperature and the LAI, but short‐term drought slightly enhanced WUE. These results are helpful in understanding the responses of fragile alpine ecosystems to future climate change.

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Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China

Cited by 33 publications

References 42 publications

Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semi‐arid grassland

Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semi‐arid grassland

Plant Hydraulic Stress Strategy Improves Model Predictions of the Response of Gross Primary Productivity to Drought Across China

Drought occurrence and time‐dominated variations in water use efficiency in an alpine meadow on the Tibetan Plateau

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