CAJ | 학술논문

针对西北干旱荒漠区水分循环与生态平衡问题，利用热扩散（TDP）探针监测典型荒漠植物梭梭和柽柳的枝条和胸径的液流日变化，并分析不同尺度液流与环境因子的关系及其尺度间的转换方法。结果表明：梭梭和柽柳的枝条和胸径的液流开始时间基本与太阳辐射开始增强的时间一致，且都滞后于温度和水气压亏缺（VPD）的开始升高时间。太阳总辐射是植物液流的启动器，而VPD是植物液流的加速器。不同环境因子对梭梭和柽柳不同尺度液流的影响作用不同，整体相关性大小为：总辐射＞光合有效辐射＞温度＞VPD。梭梭枝条间差异不明显，可以较好的上推出胸径的液流密度，即梭梭枝条尺度和冠层尺度间蒸腾作用可以较好的转换：y=1.925x+0.569，R2=0.956。柽柳枝条间差异较大，枝条液流与胸径液流间的相关性相对较小（y=2.418x+0.808，R2=0.697），把枝条液流上推到胸径尺度需分析不同位置的枝条间液流的差异性及其与微环境的关系，进一步修正尺度上推方程。
침대서북간한황막구수분순배여생태평형문제，이용열확산（TDP）탐침감측전형황막식물사사화정류적지조화흉경적액류일변화，병분석불동척도액류여배경인자적관계급기척도간적전환방법。결과표명：사사화정류적지조화흉경적액류개시시간기본여태양복사개시증강적시간일치，차도체후우온도화수기압우결（VPD）적개시승고시간。태양총복사시식물액류적계동기，이VPD시식물액류적가속기。불동배경인자대사사화정류불동척도액류적영향작용불동，정체상관성대소위：총복사＞광합유효복사＞온도＞VPD。사사지조간차이불명현，가이교호적상추출흉경적액류밀도，즉사사지조척도화관층척도간증등작용가이교호적전환：y=1.925x+0.569，R2=0.956。정류지조간차이교대，지조액류여흉경액류간적상관성상대교소（y=2.418x+0.808，R2=0.697），파지조액류상추도흉경척도수분석불동위치적지조간액류적차이성급기여미배경적관계，진일보수정척도상추방정。
Aiming at solving the problem of hydrological cycle and ecological balance in northwest arid desert,thermal dissipation probes (TDP) were used to monitor diurnal change characteristic of sap flow in two desert plants Haloxylon ammodendron and Tamarix chinensis in branch and canopy scales,respectively.The relationships of sap flow in different scales and environment factors,as well as up-scaling were analyzed.The results showed that the two plants sap flow start time in both scales (branch scale and canopy scale) were basically in accordance with the time of solar radiance beginning to enhance,and lagged behind the time of temperature and VPD (vapour pressure deficit) beginning to rise.Global radiance was the launcher of plant sap flow,while VPD was the accelerator.The different environment factors influenced dissimilarly on sap flow of two plants in different scales,and the correlations between environment factors and sap flow were global radiance >photosynthetically active radiation (PAR) > temperature > VPD.Sap flows of Haloxylon ammodendron branches which had no significant difference could be used to upscale the sap flow of the DBH.That was to say, the transpiration of Haloxylon ammodendron in different scales could transform well:y=1.925x+0.569,R2=0.956.While sap flows of Tamarix chinensis branches which had difference could not be used very well to upscale the sap flow of the DBH:y=2.418x+0.808,R2=0.697.Transpiration up-scaling from branch to canopy needed to analyse the different R2 of sap flow of branches in different positions and the relationship with microenvironment,and modified the up-scaling formula further.