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应用热平衡茎流测量技术,Li-6400光合作用测量系统和自动气象站,对科尔沁沙地杨树苗木生长过程中的蒸腾耗水规律及其与环境因子的关系进行研究。结果表明,杨树液流日变化曲线根据天气条件的不同呈现为多峰或宽峰状态,液流启动时间为04:30,并在21:00达到最低值。液流通量密度变化趋势与环境因子变化趋势相吻合,液流的变化是受各环境因子综合作用的结果。光合有效辐射(Q)和空气水蒸汽压亏缺(D)是杨树苗木蒸腾耗水的主要驱动因子,它们对于液流变化的影响快速而直接。杨树属于高耗水低水分利用型植物,适合在水分条件较好的立地条件下进行栽植。
Using the heat balance flow measurement technology, the Li-6400 photosynthesis measurement system and the automatic weather station, the transpiration water consumption of poplar seedlings in Horqin sandy land and its relationship with environmental factors were studied. The results showed that the diurnal variation curve of poplar flow presented multi-peak or broad-peak state according to the weather conditions. The flow start time was 04:30 and reached the lowest value at 21:00. The trend of liquid flux density coincides with the change trend of environmental factors, and the change of liquid flow is the result of the comprehensive effect of each environmental factor. Photosynthetic active radiation (Q) and air water vapor pressure deficit (D) are the main drivers of transpirational water consumption of poplar seedlings, and they have a quick and direct impact on the change of liquid flow. Poplar is a plant with high water consumption and low water use, which is suitable for planting under better water conditions.