干旱区荒漠-绿洲过渡带3种典型灌木气孔导度对环境变化的响应及其对蒸腾的调控

郭飞,吉喜斌,金博文,赵丽雯,赵文玥,焦丹丹

The Response of Stomatal Conductance of Three Typical Shrubs to Environmental Change and Stomatal Regulation of Transpiration in an Arid Desert-oasis Ecotone

Fei GUO,Xibin JI,Bowen JIN,Liwen ZHAO,Wenyue ZHAO,Dandan JIAO

表1 降雨前后环境因子和3种灌木气孔导度、 叶水势、 蒸腾速率日均值对比

Table 1 Comparison of the daily mean values of environmental factors and stomatal conductance、 leaf water potential、 transpiration rate of the three shrubs prior to and following rainfall

降雨前 降雨后 降雨后/降雨前 统计学检验P 0~30 cm土壤含水量/(m3·m?3) 0.035±0.001 0.058±0.001 1.657 0.002* 30~200 cm土壤含水量/(m3·m?3) 0.064±0.001 0.068±0.001 1.063 0.079 VPD/kPa 5.653±0.268 4.602±0.283 0.814 0.000* T/℃ 36.559±1.788 33.769±1.384 0.924 0.000* PAR/(μmol·m?2·s?1) 891.459±35.077 917.385±42.508 1.029 0.724 梭梭气孔导度/(mol·m?2·s?1) 0.096±0.008 0.104±0.011 1.083 0.041* 泡泡刺气孔导度/(mol·m?2·s?1) 0.113±0.011 0.124±0.013 1.097 0.069 沙拐枣气孔导度/(mol·m?2·s?1) 0.125±0.012 0.144±0.014 1.152 0.037* 梭梭叶片水势/MPa -3.432±0.126 -2.869±0.118 0.836 0.019* 泡泡刺叶片水势/MPa -4.706±0.154 -3.770±0.183 0.801 0.000* 沙拐枣叶片水势/MPa -1.956±0.127 -1.546±0.125 0.790 0.001* 梭梭蒸腾速率/(mmol·m?2·s?1) 4.572±0.248 4.056±0.239 0.887 0.010* 泡泡刺蒸腾速率/(mmol·m?2·s?1) 6.022±0.273 4.433±0.263 0.736 0.000* 沙拐枣蒸腾速率/(mmol·m?2·s?1) 6.375±0.257 6.099±0.243 0.957 0.101