灌溉植被梭梭、白刺光合蒸腾特性及影响因素研究

A Research Between Photosynthetic,Transpiration Characteristics and Impact of Irrigated Vegetation of Haloxylon ammodendron and Nitraria tangutorum

通过灌溉植被梭梭、白刺光合生理特性测定结果显示:梭梭、白刺光合、蒸腾日变化均呈单峰曲线,上午主要进行光合作用,10:00达到峰值,下午蒸腾作用较强,14:00～16∶00达到高峰期;灌溉植被光合速率随灌水量的增加而增大,灌溉梭梭平均光合速率相对免灌对照增加量为1.8～4.2μmolCO2·m-2·s-1,灌溉白刺相对增加量为1.5～2.3μmolCO2·m-2·s-1,梭梭光合增加量较高;灌溉梭梭蒸腾速率高于对照,增量为2.4～6.8mmolH2O·m-2·s-1,灌溉白刺蒸腾速率低于对照,减量为6.2～12.0mmolH2O·m-2·s-1;相关分析表明:光量子密度、胞间CO2浓度是影响梭梭、白刺光合作用的主要因子,大气温度、水汽压是影响其蒸腾作用的因子,叶片温度对灌溉植被梭梭、白刺的光合和蒸腾速率变化反应特别敏感,是影响其生理进程的重要因素之一.

By way of mensuration to photosynthetic physiology characteristics of Haloxylon ammodendron and Nitraria tangutorum showed that diurnal course of photosynthetic rate and transpiration rate are singer-peak type curve,photosynthetic rate is carry though at the am.and its peak appear at 10:00,transpiration rate is stronger at pm.and its peak appear at 14:00～16:00,photosynthetic rate of irrigated vegetation is augmenter with increase of irrigation quantity,irrigated vegetation of Haloxylon ammodendron increments are 1.8～4.2 μmol CO_2·m^(-2)·s^(-1) than CK and Nitraria tangutorum increments are 1.5～2.3 μmol CO_2·m^(-2)·s^(-1),photosynthetic rate increment is higher than Nitraria tangutorum.transpiration rate of irrigate vegetation of Haloxylon ammodendron is higher than CK,it increments are 2.4～6.8 mmol H_2O·m^(-2)·s^(-1) and Nitraria tangutorum is lower than CK,it decrements are 6.2～12.0 mmol H_2O·m^(-2)·s^(-1).By correlation analysis showed that photons density (Qn) and cell concentration of CO_2 (CINT) are important effect factors with photosynthesis of Haloxylon ammodendron and Nitraria tangutorum and transpiration rates effect factors are temperature (TA) and pressure of water vapor (EAIA),Tl is every sensitivity to change faction of photosynthetic rate and transpiration rate of irrigated vegetation Haloxylon ammodendron and Nitraria tangutorum,its one of the important effect factors to their physiolical course.