Response of plant production to growing/non-growing season asymmetric warming in an alpine meadow of the Northern Tibetan Plateau

Fu, Gang; Zhang, Hao Rui; Sun, Wei

doi:10.1016/j.scitotenv.2018.09.384

Cited by 51 publications

(34 citation statements)

References 17 publications

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“…The SEM results revealed that warming aggravated water deficits (atmospheric and soil) and then, reduced K. pygmaea coverage and BGB, leading to suppressive effects on GEP and ER. The above findings are partially supported by the SWE results and previous studies (Fu et al., 2019; Niu et al., 2008). In addition, declines in SM induced by warming further exacerbate the negative effects of VPD on plant growth.…”

Section: Discussionsupporting

confidence: 87%

“…Studies have documented that warming significantly decreases ER and GEP primarily through its aggravated atmospheric and soil water deficits, which then suppress plant growth (Fu et al., 2019; Niu et al., 2008). VPD, SM and plant coverage play important roles in explaining variations in carbon fluxes across alpine grasslands (J. Chen, Luo, Xia, Wilcox, et al., 2016; N. Chen et al., 2020; T. Zhang et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

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Multiple‐scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands

Chen

Zhang

Zhu

et al. 2020

Global Ecol. Biogeogr.

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Aim Ecosystem carbon use efficiency (CUEe) is a core parameter of ecosystem process models, but its relationships with climate are still uncertain, especially for ecosystems with harsh environments. Large inconsistencies in climate impacts on the CUEe have been reported among various spatial scales. The goal of this study was to examine whether warming promotes or restricts the CUEe and whether the CUEe responds to a warming gradient in a linear or nonlinear manner. Location Tibetan Plateau. Time period 2000–2018. Major taxa studied Alpine grassland ecosystem. Methods We integrated multiple‐source data of carbon fluxes and CUEe, including warming experiments at a site scale, eddy covariance observations at a landscape scale and synthesized warming experiments and ecosystem process models at a regional scale. Next, we deployed a statistical model to examine the warming impacts on the CUEe across scales; the effects of biotic and abiotic factors on the CUEe and its components were summarized based on the results of standardized major axis tests and routines, structural equation modelling and nonlinear models. Results This study reported a suppressive warming impact on the CUEe, which followed a nonlinear curve with severe inhibition in the high‐level warming treatment. With a warming threshold of 1.5–2.0°C, CUEe response patterns transitioned from no change to a significant decrease. The restriction effects can be ascribed to the joint adverse and asymmetric effects of warming on CUEe components under multiple‐level warming. Warming‐modified relationships among CUEe components and the nonlinear effects of biotic and abiotic factors led to the nonlinear responses of CUEe to warming. Main conclusions This study revealed suppressive and nonlinear effects of warming on the CUEe, including especially dramatic CUEe decreases with high‐level warming. These findings are critical for optimizing model parameters and improving predictions of the carbon sequestration capacity of alpine grasslands.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Multiple‐scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands

Chen

Zhang

Zhu

et al. 2020

Global Ecol. Biogeogr.

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“…The precipitation data were mainly recorded automatically by the HOBO weather station (Onset Computer Corporation, Bourne, MA, USA), installed 3 m outside the test plot area 27,28 . The weather station set the measurement time and measurement parameters according to the required meteorological factor data.…”

Section: Methodsmentioning

confidence: 99%

Effect of precipitation on respiration of different reconstructed soils

Lei

Han²

2020

Sci Rep

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Respiration and hydrothermal characteristics of four reconstructed soils in barren gravel land at a site in Shaanxi Province were monitored before, during, and after two precipitation events. Both precipitation events significantly reduced soil temperature but there were great fluctuations in temperature after the second precipitation event. Moreover, precipitation increased the moisture content of the reconstructed soils. Before the first precipitation event, the soil volumetric water content was relatively stable, while it gradually decreased before the second precipitation event. The first precipitation event significantly stimulated the respiration rate for all reconstructed soils, while the second precipitation event generally inhibited it, especially during the precipitation event. The key factors influencing respiration for different reconstructed soils were different between the precipitation events. When soil volumetric water content showed persistent variation before precipitation, soil moisture was the most influential factor. In contrast, if water content was stable, soil temperature was more influential. Soil moisture and temperature jointly influenced soil respiration before, during, and after the precipitation event, while soil moisture was always the most influential factor after precipitation. Soil respiration is the main component of the carbon cycle in terrestrial ecosystems. It is the second largest source of carbon emissions after atmospheric photosynthesis between the atmosphere and terrestrial ecosystems 1,2. Small changes in soil respiration significantly affected global carbon dynamics 3. A detailed analysis of the dynamics of soil respiration and its controlling factors is of great significance for accurately predicting changes in the carbon cycle under future climate change conditions 4. Soil temperature and soil moisture are the most important environmental factors affecting soil respiration 5,6 , and there is an interaction between the effects of soil temperature and soil moisture on soil respiration. Under conditions of future climate change, precipitation will change greatly, and the frequency of drought and extreme precipitation will increase 7. There are two different views on how precipitation might affect soil respiration. One is that precipitation will strongly and quickly stimulate soil respiration. This pulse is called the 'Birch effect' 8. However, it has been shown that the 'Birch effect' does not apply to all soils, and that for moist to wet soils, precipitation will instead inhibit soil respiration 9. The effect of precipitation on soil respiration is affected by environmental conditions such as soil temperature and moisture, and there is complex relationship of soil respiration with soil temperature and moisture. Several previous studies have demonstrated that there are many factors that could influence the response of soil respiration to precipitation events, including, both antecedent soil moisture and precipitation conditions 10 , different soil temperature and moistu...

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“…The surface temperature of the Northern Tibet has increased by approximately 0.45 ℃ from 2001 to 2015 (Sun et al, 2019), and will continue warming (Diffenbaugh and Field, 2013). Several studies conducted in the Damxung County (Fu et al, 2019;Yu et al, 2019b), the Xainza County (Lu et al, 2013;Ma et al, 2017), the Baingoin County (Ganjurjav et al, 2016;Zhang et al, 2019) and the Nagqu City (Cui et al, 2017;Wu et al, 2020) have investigated the responses of localized alpine grasslands to climate warming under controlled warming conditions in the Northern Tibet. However, to our best knowledge, no studies have examined the response of nutritional quality to warming in the alpine grasslands of the Northern Tibet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Long-Term Experimental Warming on the Nutritional Quality of Alpine Meadows in the Northern Tibet

Sun

Zhang

et al. 2020

Journal of Resources and Ecology

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Response of plant production to growing/non-growing season asymmetric warming in an alpine meadow of the Northern Tibetan Plateau

Cited by 51 publications

References 17 publications

Multiple‐scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands

Multiple‐scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands

Effect of precipitation on respiration of different reconstructed soils

Effect of Long-Term Experimental Warming on the Nutritional Quality of Alpine Meadows in the Northern Tibet

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