Open AccessJournal Article
Characteristics of transpiration and canopy stomatal conductance of Schima superba plantation and their responses to environmental factors.
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TL;DR: Granier's thermal dissipation probes were applied to measure sap flow density of 15 trees in a typical plantation stand, in which environmental factors including photosynthetically active radiation (PAR), air relative humidity, air temperature and soil moisture were recorded synchronously.
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Abstract: In order to understand water use characteristics of Schima superba plantation and their relationships with environmental factors,Granier's thermal dissipation probes were applied to measure sap flow density of 15 trees in a typical plantation stand,in which environmental factors including photosynthetically active radiation(PAR),air relative humidity,air temperature and soil moisture were recorded synchronouslyStand transpiration(Jd) and canopy stomatal conductance(gs) were then calculated based on sap flow density,sapwood area,environmental humidity and temperature from December 2007(dry season) and September 2008(wet season)The results showed that trees with larger sapwood areas had greater contribution of stand transpirationJd was found to be significantly different during wet and dry seasons,which had an average of 211 g H2O s-1 in September but only 703 g H2O s-1 in December,indicating a dramatic seasonal variation of itIn the meantime,Jd was found to be significantly correlated with environmental factors,in which PAR had the largest correlation coefficient and followed by vapor pressure deficit(VPD),air relative humidity and air temperature in sequenceOn the other hand,the maximum gs were calculated to be 308 mmol m-2s-1 and 197 mmol m-2s-1 in September and December,respectivelyIt had positive linear relationship with PAR but negative one with VPD when PAR was larger than 1000 μmol m-2s-1 and VPD was over 2 kPaHowever,gs did not present any statistically significant relationship with soil moisture either in July or December,indicating that soil moisture was not the major environmental factor influencing stand transpiration of Ssuperba during our study periods
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Citations
Sap flow characteristics and responses to summer rainfall for Pinus tabulaeformis and Hippophae rhamnoides in the Loess hilly region of China.
TL;DR: The results indicated that the diurnal variation in the normalized F d values exhibited a single‐peak curve for P. tabulaeformis, while H. rhamnoides showed multiple peaks and should be considered isohydric and anisohydric species, respectively in the afforestation activities and the local plantation management under the context of the frequently seasonal drought in the loess hilly region.
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Effects of size and microclimate on whole-tree water use and hydraulic regulation in Schima superba trees.
TL;DR: This study quantified annual and seasonal water use of a S. superba plantation in subtropical South China and revealed the coordinated effect of stoma and hydraulic conductance on transpiration, providing information for large-scale afforestation and future water management.
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