Carbon dioxide effects on stomatal responses to the environment and water use by crops under field conditions

Bunce, James A.

doi:10.1007/s00442-003-1401-6

Cited by 146 publications

(122 citation statements)

References 41 publications

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“…This simplification might induce uncertainties in simulated ET for some crop species. Some studies have proved that the maximum stomatal conductance of summer maize is usually lower than that of winter wheat (Kelliher et al, 1995;Bunce, 2004). In this study, one maximum stomatal conductance was used to calculate ET for summer maize and winter wheat, resulting in overestimation of ET in the growing seasons of summer maize.…”

Section: Beps Model Evaluationmentioning

confidence: 98%

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Liu

Zhou

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. Terrestrial carbon and water cycles are interactively linked at various spatial and temporal scales. Evapotranspiration (ET) plays a key role in the terrestrial water cycle, altering carbon sequestration of terrestrial ecosystems. The study of ET and its response to climate and vegetation changes is critical in China because water availability is a limiting factor for the functioning of terrestrial ecosystems in vast arid and semiarid regions. To constrain uncertainties in ET estimation, the process-based Boreal Ecosystem Productivity Simulator (BEPS) model was employed in conjunction with a newly developed leaf area index (LAI) data set, MODIS land cover, meteorological, and soil data to simulate daily ET and water yield at a spatial resolution of 500 m over China for the period from 2000 to 2010. The spatial and temporal variations of ET and water yield were analyzed. The influences of climatic factors (temperature and precipitation) and vegetation (land cover types and LAI) on these variations were assessed.Validations against ET measured at five ChinaFLUX sites showed that the BEPS model was able to simulate daily and annual ET well at site scales. Simulated annual ET exhibited a distinguishable southeast to northwest decreasing gradient, corresponding to climate conditions and vegetation types. It increased with the increase of LAI in 74 % of China's landmass and was positively correlated with temperature in most areas of southwest, south, east, and central China. The correlation between annual ET and precipitation was positive in the arid and semiarid areas of northwest and north China, but negative in the Tibetan Plateau and humid southeast China. The national annual ET varied from 345.5 mm in 2001 to 387.8 mm in 2005, with an average of 369.8 mm during the study period. The overall rate of increase, 1.7 mm yr −1 (R 2 = 0.18, p = 0.19), was mainly driven by the increase of total ET in forests. During 2006During -2009 and LAI decreased widely and consequently caused a detectable decrease in national total ET. Annual ET increased over 62.2 % of China's landmass, especially in the cropland areas of the southern Haihe River basin, most of the Huaihe River basin, and the southeastern Yangtze River basin. It decreased in parts of northeast, north, northwest, south China, especially in eastern Qinghai-Tibetan Plateau, the south of Yunnan Province, and Hainan Province. Reduction in precipitation and increase in ET caused vast regions in China, especially the regions south of Yangtze River, to experience significant decreases in water yield, while some sporadically distributed areas experienced increases in water yield. This study shows that the terrestrial water cycles in China's terrestrial ecosystems appear to have been intensified by recent climatic variability and human induced vegetation changes.

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Section: Beps Model Evaluationmentioning

confidence: 98%

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Liu

Zhou

et al. 2013

Hydrol. Earth Syst. Sci.

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“…This effect, known as the CO2 fertilization effect, leads to a higher leaf area index (LAI) in the vegetation, which can reduce the radiation reaching the soil surface, thereby reducing soil evaporation, and increasing the streamflow. However, Bunce [46] in a review work concludes that an increase in CO2 concentrations rarely leads to higher LAI, unless ventilation is artificial, such as it occurs in chambers and greenhouses. In addition, the author indicates that LAI increases above 3-4 m have a minimal effect on evapotranspiration as a result of shade and higher canopy humidity.…”

Section: Vulnerability Of Streamflow To Change In Temperature Rainfamentioning

confidence: 99%

Water Resources Response to Changes in Temperature, Rainfall and CO2 Concentration: A First Approach in NW Spain

Arias

Rodríguez‐Blanco

Nunes

et al. 2014

Water

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Assessment of the diverse responses of water resources to climate change and high concentrations of CO2 is crucial for the appropriate management of natural ecosystems. Despite numerous studies on the impact of climate change on different regions, it is still necessary to evaluate the impact of these changes at the local scale. In this study, the Soil and Water Assessment Tool (SWAT) model was used to evaluate the potential impact of changes in temperature, rainfall and CO2 concentration on water resources in a rural catchment in NW Spain for the periods 2031-2060 and 2069-2098, using 1981-2010 as a reference period. For the simulations we used compiled regional climate models of the ENSEMBLES project for future climate input data and two CO2 concentration scenarios (550 and 660 ppm). The results showed that changes in the concentration of CO2 and climate had a significant effect on water resources. Overall, the results suggest a decrease in streamflow of 16% for the period 2031-2060 (intermediate future) and 35% by the end of the 21st century as a consequence of decreasing rainfall (2031-2060: −6%; 2069-2098: −15%) and increasing temperature

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“…Numerous experiments have been carried out to investigate the responses of soil respiration to elevated [CO 2 ] (Lin et al, 2001;King et al, 2004;Astrid et al, 2004;Bernhardt et al, 2006;Pregitzer et al, 2008). Elevated [CO 2 ] can reduce diffusive conductance (Pearson et al, 1995;Niklaus et al, 1998) and stomatal conductance of the leaves (Saxe et al, 1998), which leads to decreased rates of canopy transpiration and increased soil moisture in CO 2 enrichment plots (Bunce, 2004). As a result, soil microbial processes such as litter decomposition and nutrient mineralization were stimulated (Niklaus et al, 1998).…”

Section: Q Deng Et Al: Responses Of Soil Respiration To Elevated Camentioning

confidence: 99%

Responses of soil respiration to elevated carbon dioxide and nitrogen addition in young subtropical forest ecosystems in China

et al. 2010

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Abstract. Global climate change in the real world always exhibits simultaneous changes in multiple factors. Prediction of ecosystem responses to multi-factor global changes in a future world strongly relies on our understanding of their interactions. However, it is still unclear how nitrogen (N) deposition and elevated atmospheric carbon dioxide concentration [CO 2 ] would interactively influence forest floor soil respiration in subtropical China. We assessed the main and interactive effects of elevated [CO 2 ] and N addition on soil respiration by growing tree seedlings in ten large open-top chambers under CO 2 (ambient CO 2 and 700 µmol mol −1 ) and nitrogen (ambient and 100 kg N ha −1 yr −1 ) treatments. Soil respiration, soil temperature and soil moisture were measured for 30 months, as well as above-ground biomass, root biomass and soil organic matter (SOM). Results showed that soil respiration displayed strong seasonal patterns with higher values observed in the wet season (April-September) and lower values in the dry season (October-March) in all treatments. Significant exponential relationships between soil respiration rates and soil temperatures, as well as significant linear relationships between soil respiration rates and soil moistures (below 15%) were found. Both CO 2 and N treatments significantly affected soil respiration, and there was significant interaction between elevated [CO 2 ] and N addition (p < 0.001, p = 0.003, and p = 0.006, respectively). We also observed that the stimulatory effect of individual elevated [CO 2 ] (about 29% increased) was maintained throughout the experimental period. The positive effect of N addition was found only in 2006 (8.17% increased), and then had been weakened over time. Their combined effect on soil respiration (about 50% increased) was greater thanCorrespondence to: D. Zhang (zhangdeq@scbg.ac.cn) the impact of either one alone. Mean value of annual soil respiration was 5.32 ± 0.08, 4.54 ± 0.10, 3.56 ± 0.03 and 3.53 ± 0.03 kg CO 2 m −2 yr −1 in the chambers exposed to elevated [CO 2 ] and high N deposition (CN), elevated [CO 2 ] and ambient N deposition (CC), ambient [CO 2 ] and high N deposition (NN), and ambient [CO 2 ] and ambient N deposition (CK as a control), respectively. Greater above-ground biomass and root biomass was obtained in the CN, CC and NN treatments, and higher soil organic matter was observed only in the CN treatment. In conclusion, the combined effect of elevated [CO 2 ] and N addition on soil respiration was apparent interaction. They should be evaluated in combination in subtropical forest ecosystems in China where the atmospheric CO 2 and N deposition have been increasing simultaneously and remarkably.

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Carbon dioxide effects on stomatal responses to the environment and water use by crops under field conditions

Cited by 146 publications

References 41 publications

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Water Resources Response to Changes in Temperature, Rainfall and CO2 Concentration: A First Approach in NW Spain

Responses of soil respiration to elevated carbon dioxide and nitrogen addition in young subtropical forest ecosystems in China

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