【摘要】 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。更多还原

【Abstract】 The sap flow and transpiration regulation of 30a Pinus tabulaeformis was researched by using TDP method in Guluban Forest Farms of Daqing Mountain.The results indicate that the difference of water-supply capacity is great under the cambium of stem radial section in growth season.The greatest velocity is located below 3cm of cambinm.The daily course of sap flow of Pinus tabulaeformis presents obvious diurnal variation.The sap flow reaches its peak value at 11:00,the value is 0.2866cm~3/s～0.3060 cm~3/s.The relationship between sap flow value(Y) and breast diameter(X) could be expressed by equation Y=0.0053EXP(0.4823X).In the same site condition,the transpiration of individual decreases(from 0.5434 to 0.3197cm~3/s) with the increase of stand density(from 2147 stocks/ha to 4463 stocks/ha) in shady-slope,but the transpiration range of variation of stand is little(the mean water use for transpiration of stand is 0.3710±0.489 mm/h).The results show that the optimum stand density of 30a Pinus tabulaeformis is 3307stocks/ha.更多还原