Temporal variation and controlling factors of canopy conductance in <i>Artemisia ordosica</i> community

WANG Shan; ZHA Tian-shan; JIA Xin; WU Ya-juan; BAI Yu-jie; FENG Wei

doi:10.13332/j.1000-1522.20160409

Journal of Beijing Forestry University > 2017 > 39(3): 65-73. > DOI: 10.13332/j.1000-1522.20160409

WANG Shan, ZHA Tian-shan, JIA Xin, WU Ya-juan, BAI Yu-jie, FENG Wei. Temporal variation and controlling factors of canopy conductance in Artemisia ordosica community[J]. Journal of Beijing Forestry University, 2017, 39(3): 65-73. DOI: 10.13332/j.1000-1522.20160409

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Temporal variation and controlling factors of canopy conductance in Artemisia ordosica community

WANG Shan^1,,
ZHA Tian-shan^1,2,3,
JIA Xin^1,2,3, ,,
WU Ya-juan¹,
BAI Yu-jie¹,
FENG Wei^1,2,3

1.
School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, P. R. China
2.
Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, Beijing Forestry University, Beijing, 100083, P.R. China
3.
Yanchi Ecology Research Station of the Mu Us Desert, Yanchi, Ningxia, 751500, P. R. China

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Received Date: December 13, 2016
Revised Date: January 29, 2017
Published Date: February 28, 2017

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Abstract

Abstract

Canopy conductance (g_c) is an important factor influencing plant transpiration and photosynthesis, and it is sensitive to environmental factors. Evapotranspiration and environmental factors of a shrub ecosystem, which was dominated by Artemisia ordosica in northwestern China, were continuously measured using eddy covariance technique in growing season (May-October) in 2015. Meteorological variables including air temperature (T_a), relative humidity (RH), photosynthetic active radiation (PAR), soil volumetric water content (VWC), and precipitation (PP) were also measured. g_c was calculated using the inverted Penman-Monteith equation. Diurnal pattern in g_c revealed a clear seasonal trend, with g_c peaking 2 hours earlier in summer (from May to August) than autumn(from September to October)(10:00, 3-4 hours and 1-2 hours before VPD and PAR). During growing season, g_c increased positively with vapor pressure deficit (VPD) and PAR, respectively, saturating at 1.5 kPa and 1 200 μmol/(m²·s), then decreasing with these variables when greater than their respective threshold.The g_c values had positive relationship with soil volumetric water content at 30 cm depth (VWC_30) under high VWC_30 (≥0.16 m³/m³) during the whole growing season. g_c was more responsive to PAR and VPD when VWC_30 was high. It was concluded that VWC played a critical role in regulating canopy conductance in desert ecosystems. Our results could potentially provide important baseline information towards hydrological model creation of arid and semi-arid ecosystems.
- canopy conductance,
- soil water content,
- semiarid region,
- transpiration,
- photosynthesis

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References (23)

References

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