Precipitation Pattern Determines the Inter-annual Variation of Herbaceous Layer and Carbon Fluxes in a Phreatophyte-Dominated Desert Ecosystem

Liu, Ran; Cieraad, Ellen; Li, Yan; Ma, Jie

doi:10.1007/s10021-015-9954-x

Cited by 52 publications

(50 citation statements)

References 68 publications

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“…Arid and semiarid areas account for approximately 20-35% of total terrestrial net primary productivity (NPP) (Field et al 1998) and 15-20% of total soil organic carbon (Lal 2004;Liu et al 2016). Some dryland ecosystems have shown a significant carbon sequestration potential, both through photosynthesis by plants (shrubs and grasses) (Gao et al 2012) and CO 2 absorption by alkaline soils Xie et al 2009).…”

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confidence: 99%

“…Recent evidence suggests an increasingly important role of semiarid ecosystems in driving the trend and interannual variability of the global carbon cycle (Poulter et al 2014;Ahlström et al 2015). Despite the importance of drylands, carbon, water and energy exchanges and their influencing factors are less well understood in these ecosystems compared to mesic forests and grasslands (Scott et al 2015;Biederman et al 2016;Liu et al 2016), limiting our ability to project the global carbon balance under changing climate. In particular, the arid and semiarid shrublands of northern China, which represent an important land-cover type in Eurasia, are subject to increasing temperatures and altered PPT patterns (Liu et al 2011;Gao et al 2012).…”

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confidence: 99%

“…In particular, the arid and semiarid shrublands of northern China, which represent an important land-cover type in Eurasia, are subject to increasing temperatures and altered PPT patterns (Liu et al 2011;Gao et al 2012). However, arid and semiarid ecosystems dominated by shrub species are largely under-represented in studies of climate change impacts (Liu et al 2016).…”

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confidence: 99%

“…rising temperatures and shifting PPT patterns) (Li et al 2005;Liu et al 2016;Zhang et al 2016), and their responses to climatic variability may feed back to the regional or global climate system (Poulter et al 2014;Ahlström et al 2015). Global climate models suggest a warmer and drier future climate in semiarid and arid regions of Asia (McCarthy et al 2001).…”

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confidence: 99%

“…However, little has been done to quantify the carbon sequestration potential of the recovering shrub vegetation (Gao et al 2012;Liu et al 2016). In addition, few (if any) studies have formally examined the biophysical control of surface energy partitioning (e.g.…”

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confidence: 99%

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Dynamics and biophysical controls of carbon, water and energy exchange over a semiarid shrubland in northern China

Jia¹

2017

Diss. For.

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To be presented, with the permission of the Faculty of Science and Forestry of the University of Eastern Finland, for public examination in auditorium BOR 100 in borealis building on Joensuu campus of the University of Eastern Finland, Yliopistokatu 7, Joensuu on 23 May 2017 at 12 o' clock noon. ABSTRACTThe main aim of this study was to investigate the dynamics and biophysical controls of carbon, water and energy exchange over a semiarid shrub ecosystem in the Mu Us desert, northern China, using continuous eddy-covariance (EC) measurements. Specific objectives were as follows: (1) To examine intra-annual variations in net ecosystem CO 2 exchange (NEE) and its biophysical controls (Paper I); (2) To quantify the diurnal and seasonal variations in surface energy-balance components, and to examine the partitioning of net radiation (R n ) among different energy components at diurnal and seasonal timescales (Paper II); and (3) To examine how ecosystem production and water use efficiency (WUE) vary inter-annually with contrasting precipitation (PPT) and soil moisture patterns (Paper III).The results showed that, soil water content (i.e. at 30 cm depth, SWC_30), or water deficit, imposed a major control on the seasonal dynamics of carbon assimilation and energy partitioning. Water deficit (i.e. SWC_30 < 0.10 m 3 m -3 ) was a major constraint over daytime NEE, and also interacted with other stresses, e.g. heat stress and photoinhibition (Paper I). Low soil moisture reduced the temperature sensitivity (Q 10 ) of total ecosystem respiration (TER). Rain events triggered immediate pulses of carbon release from the ecosystem, followed by peaks of CO 2 uptake 1-2 days later. Leaf area index (LAI) accounted for 45 and 65% of the seasonal variation in NEE and gross ecosystem production (GEP), respectively. On the other hand, sensible heat flux (H) exceeded latent heat flux (λE) during most time of the year (Paper II). The evaporative fraction (EF, i.e. λE/R n ), Priestley-Taylor coefficient (α), surface conductance (g s ) and decoupling coefficient (Ω) all correlated positively with SWC_30 and LAI. The direct enhancement of λE by high vapor pressure deficit (VPD) was buffered by a concurrent suppression of g s , which controlled EF and α by mediating the effects of LAI, SWC_30 and VPD.At the annual scale, net ecosystem production (NEP, here defined as −NEE) indicated a rapid shift from an annual sink of carbon in 2012 (NEP = 77 ± 10 g C m -2 yr -1 ) to a source of carbon in 2014 (NEP = -22 ± 5 g C m -2 yr -1 ), with the year 2013 being close to carbon neutral (NEP = -4 ± 10 g C m -2 yr -1 ) (Paper III). GEP, TER and evapotranspiration (ET) also declined over the three years. Suppressed annual carbon and water fluxes were observed in years with low spring soil moisture. GEP declined more than TER and ET, leading to reduced carbon sequestration and WUE (i.e. GEP/ET). Neither annual nor growing-season PPT amount could explain the year-to-year variation in carbon fluxes. ET was a better proxy for water available to ecosystem carbon...

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Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

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Dynamics and biophysical controls of carbon, water and energy exchange over a semiarid shrubland in northern China

Jia¹

2017

Diss. For.

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The effects of N‐addition on litter mixture effects depend on decomposition time: A case from mixed‐litter decomposition in the Gurbantunggut Desert

Zhao,

Yang,

Cheng

et al. 2023

Ecology and Evolution

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Changes in nitrogen (N) deposition and litter mixtures have been shown to influence ecosystem processes such as litter decomposition. However, the interactive effects of litter mixing and N‐deposition on decomposition process in desert regions remain poorly identified. We assessed the simultaneous effects of both N addition and litter mixture on mass loss in a litterbag decomposition experiment using six native plants in single‐species samples with diverse quality and 14‐species combinations in the Gurbantunggut Desert under two N addition treatments (control and N addition). The N addition had no significant effect on decomposition rate of single‐species litter (expect Haloxylon ammodendron), whereas litter mass loss and decomposition rate differed significantly among species, with variations positively correlated with initial phosphorus concentration and negatively correlated with initial lignin concentration. After 18 months, the average mass loss across litter mixtures did not overall differ from those predicted from single species either in control or N addition treatments, that is, mixing of different species had no non‐additive effects on decomposition. The N addition, however, did modify the direction of mixture effects and interacted with incubation time. Added N transformed synergistic effects of litter mixtures to antagonistic effects on mass loss after 1 month of decomposition, while transforming neutral effects of litter mixture to synergistic effects after 6 months of decomposition. Our results demonstrated that initial chemical properties played an important role in litter decomposition, while no effects of litter mixture on decomposition process in this desert region. The N addition altered the litter mixture effects on mass loss with incubation time, implying that increased N deposition in the future may have profound effects on carbon turnover to a greater extent than previously thought in desert ecosystems.

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Nonlinear response of ecosystem respiration to multiple levels of temperature increases

Chen

Zhu

Zhang

et al. 2019

Ecology and Evolution

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Global warming exerts profound impacts on terrestrial carbon cycles and feedback to climates. Ecosystem respiration (ER) is one of the main components of biosphere CO2 fluxes. However, knowledge regarding how ER responds to warming is still lacking. In this study, a manipulative experiment with five simulated temperature increases (+0℃ [Control], +2.1℃ [warming 1, W1], +2.7℃ [warming 2, W2], +3.2℃ [warming 3, W3], +3.9℃ [warming 4, W4]) was conducted to investigate ER responses to warming in an alpine meadow on the Tibetan Plateau. The results showed that ER was suppressed by warming both in dry and wet years. The responses of ER to warming all followed a nonlinear pattern. The nonlinear processes can be divided into three stages, the quick‐response stage (W1), stable stage (W1–W3), and transition stage (W4). Compared with the nonlinear model, the linear model maximally overestimated the response ratios of ER to warming 2.2% and 3.2% in 2015 and 2016, respectively, and maximally underestimated the ratio 7.0% and 2.7%. The annual differences in ER responding to warming were mainly attributed to the distinct seasonal distribution of precipitation. Specially, we found that the abrupt shift response of ER to warming under W4 treatment in 2015, which might be regulated by the excitatory effect of precipitation after long‐term drought in the mid‐growing season. This study highlights the importance of the nonlinearity of warming effects on ER, which should be taken into the global‐C‐cycling models for better predicting future carbon–climate feedbacks.

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Precipitation Pattern Determines the Inter-annual Variation of Herbaceous Layer and Carbon Fluxes in a Phreatophyte-Dominated Desert Ecosystem

Cited by 52 publications

References 68 publications

Dynamics and biophysical controls of carbon, water and energy exchange over a semiarid shrubland in northern China

Dynamics and biophysical controls of carbon, water and energy exchange over a semiarid shrubland in northern China

The effects of N‐addition on litter mixture effects depend on decomposition time: A case from mixed‐litter decomposition in the Gurbantunggut Desert

Nonlinear response of ecosystem respiration to multiple levels of temperature increases

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