Effects of spring drought on carbon sequestration, evapotranspiration and water use efficiency in the songnen meadow steppe in northeast China

Dong, Gang; Guo, Jixun; Chen, Jiquan; Sun, Ge; Gao, Song; Hu, Liping; Wang, Yunlong

doi:10.1002/eco.200

Cited by 111 publications

(60 citation statements)

References 51 publications

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“…Crops and grasslands, unable to use water in deeper soil layers because of their relatively short roots, are typically sensitive to droughts (Schwalm et al, 2010a;Wu and Chen, 2013). Droughts might decrease the carbon sequestration capacity of grassland (Dong et al, 2011;Yang and Zhou, 2013), or even change grassland from a carbon sink in "wet" years to a carbon source in "dry" ones (Aires et al, 2008;Jongen et al, 2011). The simulation here shows that the national total of carbon sequestration by grassland in China was negatively affected by drought severity, but not significantly.…”

Section: Drought Sensitivity Of Carbon Sequestration By Different Vegmentioning

confidence: 99%

Impacts of droughts on carbon sequestration by China's terrestrial ecosystems from 2000 to 2011

Liu

Zhou

et al. 2014

Biogeosciences

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Abstract. In recent years, China's terrestrial ecosystems have experienced frequent droughts. How these droughts have affected carbon sequestration by the terrestrial ecosystems is still unclear. In this study, the process-based Boreal Ecosystem Productivity Simulator (BEPS) model, driven by remotely sensed vegetation parameters, was employed to assess the effects of droughts on net ecosystem productivity (NEP) of terrestrial ecosystems in China from 2000 to 2011. Droughts of differing severity, as indicated by a standard precipitation index (SPI), hit terrestrial ecosystems in China extensively in 2001, 2006, 2009, and 2011. The national total annual NEP exhibited the slight decline of −11.3 Tg C yr−2 during the aforementioned years of extensive droughts. The NEP reduction ranged from 61.1 Tg C yr−1 to 168.8 Tg C yr−1. National and regional total NEP anomalies were correlated with the annual mean SPI, especially in Northwest China, North China, Central China, and Southwest China. The reductions in annual NEP in 2001 and 2011 might have been caused by a larger decrease in annual gross primary productivity (GPP) than in annual ecosystem respiration (ER). The reductions experienced in 2009 might be due to a decrease in annual GPP and an increase in annual ER, while reductions in 2006 could stem from a larger increase in ER than in GPP. The effects of droughts on NEP lagged up to 3–6 months, due to different responses of GPP and ER. In eastern China, where is humid and warm, droughts have predominant and short-term lagged influences on NEP. In western regions, cold and arid, the drought effects on NEP were relatively weaker but prone to lasting longer.

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Section: Drought Sensitivity Of Carbon Sequestration By Different Vegmentioning

confidence: 99%

Impacts of droughts on carbon sequestration by China's terrestrial ecosystems from 2000 to 2011

Liu

Zhou

et al. 2014

Biogeosciences

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“…Climate models also predict larger climatic variability and more frequent extreme events (e.g. droughts, storms and heat waves) in the future (Dong et al 2011). A more variable PPT regime is likely to occur in the future, being characterized by more extreme rainfall events punctuated by longer intervening dry periods (Thomey et al 2011).…”

Section: List Of Symbols and Abbreviationsmentioning

confidence: 99%

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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“…The highest carbon sink appeared in central subtropical forests (550±258 g C m -2 yr -1 ), and followed by warm temperate forests (492±37 g C m -2 yr -1 ) and northern subtropical forests (343 g C m -2 yr -1 ). Yu et al, 2013b;Chen et al, 2014;FLUXNET, 2013;Du et al, 2012;Wang et al, 2008;Liu et al, 2011aLiu et al, , 2011bDong et al, 2011aDong et al, , 2011bZhang et al, 2007 Grassland Yu et al, 2013b;Chen et al, 2014 Cool temperate forests showed lower carbon sink compared to warm temperate and temperate forests. Studies of specific ecosystem suggest that mature forests in Northeast, Southeast, and Southwest (Zhang et al, 2006a;Liu et al, 2014a;Tan et al, 2010Tan et al, , 2012Guan et al, 2006;Zhang et al, 2006b;Yan et al, 2012) and subtropical plantations (Liu et al, 2006;Wen et al, 2010) had strong carbon sequestration capacity.…”

Section: Evaluation Of Ecosystem Carbon Sink/source Based On Flux Meamentioning

confidence: 99%

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

Wang

Chen

et al. 2016

J. Geogr. Sci.

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Eddy Covariance technique (EC) achieves the direct measurement on ecosystem carbon, nitrogen and water fluxes, and it provides scientific data for accurately assessing ecosystem functions in mitigating global climate change. This paper briefly reviewed the construction and development of Chinese terrestrial ecosystem flux observation and research network (ChinaFLUX), and systematically introduced the design principle and technology of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation system of ChinaFLUX. In addition, this paper summarized the main progress of ChinaFLUX in the ecosystem carbon, nitrogen and water exchange and environmental controlling mechanisms, the spatial pattern of carbon, nitrogen and water fluxes and biogeographical mechanisms, and the regional terrestrial ecosystem carbon budget assessment. Finally, the prospects and emphases of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation of ChinaFLUX are put forward to provide theoretical references for the development of flux observation and research in China.

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Effects of spring drought on carbon sequestration, evapotranspiration and water use efficiency in the songnen meadow steppe in northeast China

Cited by 111 publications

References 51 publications

Impacts of droughts on carbon sequestration by China's terrestrial ecosystems from 2000 to 2011

Impacts of droughts on carbon sequestration by China's terrestrial ecosystems from 2000 to 2011

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

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

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