论文部分内容阅读
在温室内用盆栽法栽植了1年生茶条槭、山梨和山桃苗木,并采用4种土壤水分处理,土壤相对含水量分别为75.0%、61.1%、46.4%和35.4%。结果表明:随土壤含水量降低,3树种苗木净光合速率,蒸腾速率和气孔导度均下降,土壤含水量最低时,茶条槭苗木各生理指标降低幅度最大,山梨和山桃次之。茶条槭和山梨水分利用效率随土壤含水量的减少呈降低趋势,山桃水分利用效率呈升高趋势。水分胁迫下,3树种苗木根分配生物量显著增加。茶条槭在水分胁迫下,根冠比增加幅度最大,山梨次之,山桃最小。此外,茶条槭叶形态可塑性强,随土壤含水量降低,茶条槭单叶叶面积和总叶面积显著减小,叶厚度增加。山梨和山桃在水分胁迫下单叶叶面积及总叶面积无显著变化。综合3树种苗木在水分胁迫下的生理和形态指标及生物量分配的变化,茶条槭对水分胁迫的适应能力强于山桃和山梨。表3参31。
One-year-old maple, maple, and peach tree seedlings were planted in pots in a greenhouse with relative soil moisture content of 75.0%, 61.1%, 46.4% and 35.4%, respectively. The results showed that the net photosynthetic rate, transpiration rate and stomatal conductance of seedlings of three species decreased with the decrease of soil water content. When the soil water content was lowest, the physiological indexes of seedlings of A. grandis decreased the most, followed by Yamanashi and Juniperus. Water use efficiency of Maple and Sapirocarpus glauca decreased with the decrease of soil water content, but the water use efficiency of Populus davidiana increased. Under water stress, the biomass of the seedlings of 3 seedlings increased significantly. Under the stress of water stress, the ratio of root and shoot increased most, while that of Yamanashi was the second. In addition, the leaf morphology of tea tree maple plasticity is strong, with soil moisture decreased, single leaf maple leaf area and total leaf area was significantly reduced, leaf thickness increased. There was no significant change in leaf area and total leaf area of Yamanashi and Peach under water stress. Based on the physiological and morphological indexes and biomass allocation of three tree seedlings under water stress, the adaptability of Acer Sapiricola to water stress was stronger than that of Peach and Yamanashi. Table 3 Reference 31.