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Zhang J.,Xinjiang University | Li X.F.,The Business and Management Company of Baijiantan | Li J.G.,Xinjiang University | Wang H.,The Oilfield Company of Xinjiang | And 6 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2013

A thermal dissipation probe (TDP) was used to measure the sap flow dynamics of Populus alba L.×P.talassica in the agricultural development zones of Karamay during July 1· 25, 2012. Soil mositure, total radiation (TR), air temperature, relative humidity, water vapor pressure deficit (VPD) and wind speed were measured at the same time.The results showed that: Diurnal variation of the sap flow displayed a single peaked curve on sunny days, while it displayed a multi-peaked curves on cloudy days.The average value of sap flow was 0.6059 L/ h.Sap flow velocity per unit sapwood area was significantly correlated with TR, air temperature, and VPD and was negatively correlated with atmospheric relative humidity.The ranking of correlation coefficients was TR>air temperature>VPD>relative humidity>wind speed.Sapwood area and diameter at breast height (DBH) were significantly correlated (r =0.834), and the sap-flow velocity per unit sapwood area decreased with increasing stem diameter at breast height (DBH). Source

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