Hysteresis response of daytime net ecosystem exchange during drought

Pingintha, Natchaya; Leclerc, Monique Y.; Beasley, John P.; Durden, David; Zhang, G.; Senthong, Chuckree; Rowland, Diane

doi:10.5194/bg-7-1159-2010

Cited by 48 publications

(42 citation statements)

References 55 publications

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“…Furthermore, Körner (1995) and Unsworth et al (2004) found a hysteretic pattern of diurnal NEE which was due to a limitation of photosynthesis caused by stomatal closure at high VPD. Actually, our results are in the same sense as Pingintha et al (2010) who found a VPD saturation value of 12 hPa above which NEE decreased toward constant value when a peanut crop is under water stress condition. Bai et al, (2015) reported that, for cotton, CO2 assimilation increased with increasing VPD, reached the maximum over nearly 31 hPa and then declined.…”

Section: A B C D E Fsupporting

confidence: 79%

“…Since photosynthesis is mainly regulated by light, these results are in general agreement with the relationships found in many other studies (see for example Nieveen et al, 2005), where a saturation value of PAR can be envisaged for the CO2 assimilation. Since the stomatal regulation is strongly influenced by the crop water status, this finding can be explained with the soil water conditions (Pingintha et al, 2010), which in the DS is far from optimum, due to the scarcity of rain in the period May-June 2012 ( Table 2). The soil water scarcity determines the increase of the canopy resistance , which is associated to a decline of the photosynthetic rate (Williams et al, 2001).…”

Section: A B C D E Fmentioning

confidence: 97%

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Carbon and water dynamics of a bioenergy crop (Cynara cardunculus L.) under different meteorological conditions in a semi-arid region

2017

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To evaluate the environmental adaptability of cultivated cardoon (Cynara cardunculus L.) its water use efficiency [(WUE) -ratio between net ecosystem exchange (NEE) and evapotranspiration (ET)] was analysed. The crop was cultivated in South Italy and WUE was evaluated at different time scales during two seasons: wet and dry. Even if the crop development is similar in the two seasons, plants delay their development in the presence of drought, showing, in this way, an improvement in their adaptability. Seasonal WUE in the dry season is greater than in the wet one by +11.2%, and this is also confirmed at monthly and daily scale. Hourly analysis around the full development phase shows that WUE is greater during the wet season than during the dry one, this being explainable when considering the impact of the drivers [(photosynthetically active radiation (PAR), vapour pressure deficit (VPD), and air temperature (Tair)] on CO2 and H2O exchanges by stomatal regulation. The saturation values of NEE in function of PAR (threshold 2.5 MJ m -2 h -1 ) and VPD (threshold 10 hPa) are greater during the wet season than the dry one.Furthermore, also the linear relationships between ET and PAR and VPD showed higher slopes in the wet season than in the dry one. Drought causes reduction in both photosynthesis and evapotranspiration by stomatal regulation, however, the photosynthesis process is surely more sensitive to water stress than the crop transpiration, thus demonstrating the good adaptability of this crop to scarce water availability of semi-arid conditions.

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Section: A B C D E Fsupporting

confidence: 79%

Section: A B C D E Fmentioning

confidence: 97%

Carbon and water dynamics of a bioenergy crop (Cynara cardunculus L.) under different meteorological conditions in a semi-arid region

2017

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“…In addition, the increasing trend of WUE was found in higher latitude regions, where in contrast to that in lower latitude regions. Recent studies reported that the higher WUE can increase the drought stress experienced by plants by regulating stomatal responses (Cruz et al 2010;Pingintha et al 2010), even through the worsened drought and rising temperature tend to offset this positive effect (Brienen et al 2011). This might imply that the ecosystems in middle and low latitude areas have a weakened effect on resisting an extreme climate event such as drought, while the boreal forest has an enhanced effect on (a) (b) tolerating drought events.…”

Section: Limitation and Implications For Future Ecohydrological Procementioning

confidence: 99%

Implications of Future Water Use Efficiency for Ecohydrological Responses to Climate Change and Spatial Heterogeneity of Atmospheric CO2 in China

Zhang¹,

Jiang²,

Liu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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As the atmospheric carbon dioxide (CO 2 ) increases substantially, the spatial distribution of atmospheric CO 2 should be considered when estimating the effects of CO 2 on the carbon and water cycle coupling of terrestrial ecosystems. To evaluate this effect on future ecohydrological processes, the spatial-temporal patterns of CO 2 were established over 1951 -2099 according to the IPCC emission scenarios SRES A2 and SRES B1. Thereafter, water use efficiency (WUE) was used (i.e., Net Primary Production/Evaportranspiration) as an indicator to quantify the effects of climate change and uneven CO 2 fertilization in China. We carried out several simulated experiments to estimate WUE under different future scenarios using a land process model (Integrated Biosphere Simulator, IBIS). Results indicated that the geographical distributions of averaged WUE have considerable differences under a heterogeneous atmospheric CO 2 condition. Under the SRES A2 scenario, WUE decreased slightly with a 5% value in most areas of the southeastern and northwestern China during the 2050s, while decreasing by approximately 15% in southeastern China during the 2090s. During the period of the 2050s under SRES B1 scenario, the change rate of WUE was similar with that under SRES A2 scenario, but the WUE has a more moderate decreasing trend than that under the SRES A2 scenario. In all, the ecosystems in median and low latitude areas had a weakened effect on resisting extreme climate event such as drought. Conversely, the vegetation in a boreal forest had an enhanced buffering capability to tolerate drought events.

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“…They often demonstrate the impact of anomalies, such as drought (Schwalm et al, 2012), flood (Dušek et al, 2009), and volcanic eruption (Gu et al, 2003). Other studies have analysed responses of CO 2 uptake to different types of radiation (Knohl and Baldocchi, 2008;Niyogi et al, 2004;Oliphant et al, 2011;Urban et al, 2007Urban et al, , 2012, vapour pressure deficit, and temperature (Dewar et al, 1999;Pingintha et al, 2010). There are a few studies based on year-round data sets obtained on a daily basis (Dore et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Forest Ecosystem as a Source of Co2 During Growing Season: Relation to Weather Conditions

Taufarová¹,

Havránková²,

Dvorská³

et al. 2014

International Agrophysics

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A b s t r a c t. Net ecosystem production reflects the potential of the ecosystem to sequestrate atmospheric CO 2 . Daily net ecosystem production of a mountain Norway spruce forest of the temperate zone (Czech Republic) was determined using the eddy covariance method. Growing season days when the ecosystem was a CO 2 source were examined with respect to current weather conditions. During the 2005, 2006, and 2007 growing seasons, there were 44, 65, and 39 days, respectively, when the forest was a net CO 2 source. The current weather conditions associated with CO 2 release during the growing seasons were: cool and overcast conditions at the beginning or end of the growing seasons characterized by a 3-year mean net ecosystem production of -7.2 kg C ha -1 day -1 ; overcast or/and rainy days (-23.1 kg C ha -1 day -1 ); partly cloudy and hot days (-11.8 kg C ha -1 day -1 ); and overcast and hot days (-13.5 kg C ha -1 day -1 ). CO 2 release was the highest during the overcast or/and rainy conditions (84%, average from all years), which had the greatest impact during the major production periods. As forests are important CO 2 sinks and more frequent weather extremes are expected due to climate change, it is important to predict future forest carbon balances to study the influence of heightened variability in climatic variables.K e y w o r d s: net ecosystem production, CO 2 source days, eddy covariance, weather conditions, Norway spruce INTRODUCTIONThe net carbon budget of ecosystems consists in a fine balance between processes of carbon acquisition (such as photosynthesis, tree and plant growth, and carbon accumulation in soils) and carbon release (such as respiration of living biomass, tree mortality, microbial decomposition of dead biomass, oxidation of soil carbon, degradation and disturbance) (Malhi et al., 1999). The carbon budget expresses the ability of ecosystems to sequestrate atmospheric CO 2 . If acquisition prevails, ecosystems are considered carbon sinks. The differences among various types of ecosystems in their CO 2 sequestration potentials are large (Litton et al., 2007;Marek et al., 2011), as the aforementioned processes operate on a variety of time scales and are influenced by a number of factors. These factors include climate and meteorological parameters (amount and quality of radiation, temperature, and humidity); physiological state of the ecosystem (its age, structure, species composition, and history); water, nutrient, and substrate availability; and such ecosystem disturbances as diseases, insects, and thinning (Dore et al., 2012;Xenakis et al., 2012).Some ecosystem responses to environmental variations are immediate and direct, such as that of photosynthesis responding to light, temperature, soil moisture, and saturation deficit (Baldocchi et al., 1997;Chen et al., 1999) and respiration to temperature, soil moisture (Chen et al., 1999), and organic substrate availability (Kuzyakov and Gavrichkova, 2010). Others are indirect, mediated through such associated biophysical factors as leaf phenolo...

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Hysteresis response of daytime net ecosystem exchange during drought

Cited by 48 publications

References 55 publications

Carbon and water dynamics of a bioenergy crop (Cynara cardunculus L.) under different meteorological conditions in a semi-arid region

Carbon and water dynamics of a bioenergy crop (Cynara cardunculus L.) under different meteorological conditions in a semi-arid region

Implications of Future Water Use Efficiency for Ecohydrological Responses to Climate Change and Spatial Heterogeneity of Atmospheric CO2 in China

Forest Ecosystem as a Source of Co2 During Growing Season: Relation to Weather Conditions

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