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- W2384654718 abstract "Leymus chinensis is a dominant,rhizomatous perennial C3 species found in the grasslands of Songnen Plain,Northern China,where its productivity has decreased year by year due to environmental changes.As a dominant species growing in arid and semiarid regions,precipitation is a key factor limiting plant productivity.To determine how this species' productivity responds to different precipitation regimes and increased CO2 levels,we conducted an experiment that measured photosynthetic parameters,along with the accumulation and partitioning of biomass.Plants were subjected to combinations of three precipitation gradients(normal precipitation,normal±40%)and two CO2levels(380±20and 760±20μmol/mol)in environment-controlled chambers.The interaction between increased CO2 and precipitation had significant effects on photosynthetic parameters,belowground biomass and root∶shoot ratio,but no effect on aboveground biomass.Net photosynthetic rate,stomatal conductance,transpiration rate,aboveground and total biomass rose with increases in precipitation and CO2 concentration,but no significant change was observed when precipitation increased from normal to high under CO2 enrichment.There was no significant difference in the ratio of root to shoot among precipitation regimes at the low CO2 condition,but it changed significantly with CO2 enrichment and low precipitation.Water use efficiency and intercellular CO2 concentration increased significantly when precipitation was low,but decreased when precipitation was high under CO2 enrichment.The effect of elevated CO2 on photosynthesis and biomass accumulation was more obvious at low precipitation than at normal or high precipitation.The results suggest that at ambient CO2 levels,net photosynthetic rate and biomass of L.chinensisincrease with precipitation,but that these measures are not further affected by additional precipitation when CO2 is elevated.Furthermore,CO2 may partly compensate for the negative effect of low precipitation on the growth and development of L.chinensis." @default.
- W2384654718 created "2016-06-24" @default.
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- W2384654718 date "2015-01-01" @default.
- W2384654718 modified "2023-09-23" @default.
- W2384654718 title "Influences of precipitation regimes and elevated CO_2 on photosynthesis and biomass accumulation in Leymus chinensis" @default.
- W2384654718 hasPublicationYear "2015" @default.
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