Abstract:

Ecological rehabilitation based on artificial vegetation reconstruction which was the important technique for fathering degraded red soil was widely applied in Southern China.Forest water consumption and rational planting density during afforestation were thus increasingly concerned.〖WTBX〗Pinus elliottii 〖WTBZ〗Englem.sapflow and meteorological factors were measured synchronously using thermal dissipation probe in Qianyanzhou representative of southern degraded red soil area.Potential water use was modeled and rationality of planting density was evaluated.A significant correlation between sapwood area(SWA)and diameter at breast height(DBH)was well fitted with conic model.A significant correlation between sapwood area(SWA)and tree age(A)was well fitted with nilpotent model.Potential sap flow density model was established by multilinear regression equation.Significant correlation also existed between potential sap flow density(Qp)and three meteorological factors,i.e.canopy temperature(CT),canopy relative humidity(CRH)and photosynthetically active radiation(PAR).Potential water use model based on sapwood area and potential sap flow density could not only be used for predicting forest water consumption dynamics,but also interpolating abnormal and absent sap flow observation data.The present planting density of 〖WTBX〗P.elliottii 〖WTBZ〗Englem.in the study area was relatively reasonable as for stand water use