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应用TDP(Thermal Dissipation Probe)技术对大青山古路板林场的30a生油松人工林树干液流以及不同林分密度下的树木蒸腾耗水规律进行了研究。结果表明:1)在生长季内,树干径向断面形成层以下不同部位输水能力差异较大,最大流速位于形成层下3cm。2)油松树干液流的日进程呈现明显的昼夜变化规律。在11:00左右达到峰值,其值可达0.286 6~0.306 0cm3/s。3)树干液流量(Y)与树木的胸径(X)之间的关系可用Y=0.0053EXP(0.4823X)的指数函数模型表达。4)在相同立地条件下,随着阴坡林分密度从2 147株/hm2增加到4 463株/hm2,单株蒸腾耗水量从0.543 4cm3/s降低到0.319 7cm3/s,而林分蒸腾耗水量变化幅度较小,平均蒸腾耗水量为0.3710±0.0489(5)mm/h。结果指出,大青山30a生油松人工林经营密度应控制在3 307株/hm2左右。
The flow of water from the trunk of Pinus tabulaeformis plantation and the water consumption of trees under different stand densities were studied by using Thermal Dissipation Probe (TDP) technique. The results showed as follows: 1) The water conveyance ability differed greatly in different parts under the formation of radial section of tree trunk in the growing season, and the maximum flow velocity was 3 cm below the formation layer. 2) The daily process of Pinus tabulaeformis sap flow showed obvious diurnal variation. At about 11:00 peak, the value of up to 0.286 6 ~ 0.306 0cm3 / s. 3) The relationship between sap flux (Y) and tree diameter (X) can be expressed as an exponential model with Y = 0.0053EXP (0.4823X). 4) Under the same site conditions, the transpiration water per plant decreased from 0.543 4cm3 / s to 0.319 7cm3 / s with the density of shady slope increasing from 2 147 plants / hm2 to 4 463 plants / hm2, while the transpiration The variation of water consumption was small, and the average transpiration water consumption was 0.3710 ± 0.0489 (5) mm / h. The results indicated that the management density of Pinus tabulaeformis plantation in Daqing Mountain should be controlled at about 3 307 plants / hm2.