CAJ | 학술논문

为了研究干旱胁迫对两种灌木能源树种光合特性的影响，选择沙枣（ Elaeagnus angustifolia L．）1年生实生苗和多花柽柳（ Tamarix hohenackeri Bunge）1年生扦插苗为试验材料，通过4个不同土壤水分条件下的盆栽试验，测定叶片叶绿素含量和光合参数。结果表明：多花柽柳在各个土壤水分条件下叶片叶绿素含量均低于沙枣，多花柽柳在中度干旱胁迫条件下叶绿素含量增加，沙枣在重度干旱胁迫条件下叶绿素仍然有较高含量。随着干旱胁迫程度加重，2个树种净光合速率、蒸腾速率和气孔导度均呈下降的趋势，在中度干旱条件下净光合速率和蒸腾速率下降更明显，但胞间CO2浓度呈上升趋势。多花柽柳净光合速率和蒸腾速率日变化均呈现出“双峰”曲线，11：00时出现“光合午休”现象，气孔导度呈现“单峰”曲线；沙枣净光合速率日变化呈“单峰”曲线，上午明显高于下午。两树种蒸腾速率日变化和气孔导度日变化均表现为“双峰”曲线，呈现正相关性。
위료연구간한협박대량충관목능원수충광합특성적영향，선택사조（ Elaeagnus angustifolia L．）1년생실생묘화다화정류（ Tamarix hohenackeri Bunge）1년생천삽묘위시험재료，통과4개불동토양수분조건하적분재시험，측정협편협록소함량화광합삼수。결과표명：다화정류재각개토양수분조건하협편협록소함량균저우사조，다화정류재중도간한협박조건하협록소함량증가，사조재중도간한협박조건하협록소잉연유교고함량。수착간한협박정도가중，2개수충정광합속솔、증등속솔화기공도도균정하강적추세，재중도간한조건하정광합속솔화증등속솔하강경명현，단포간CO2농도정상승추세。다화정류정광합속솔화증등속솔일변화균정현출“쌍봉”곡선，11：00시출현“광합오휴”현상，기공도도정현“단봉”곡선；사조정광합속솔일변화정“단봉”곡선，상오명현고우하오。량수충증등속솔일변화화기공도도일변화균표현위“쌍봉”곡선，정현정상관성。
In order to study the effects of drought stress on photosynthetic characteristics of two energy resource shrubs, one-year-old Elaeagnus angustifolia L. seedlings and Tamarix hohenackeri Bunge cutting seedlings were selected as the experimental materials. Their leaf chlorophyll content and photosynthetic parameters under four different soil water condi-tions were measured in the water-controlling pot experiments. The results showed that the leaf chlorophyll content of T. hohenackeri was lower than E. angustifolia at various soil moisture conditions, leaf chlorophyll content of T. hohenackeri increased under moderate drought stress and there was still a higher content of E. angustifolia in severe drought stress conditions. With the aggravation of drought stress, the net photosynthesis rate ( Pn) , transpiration rate ( Tr) and stoma-tal conductance ( Gs) of both two tree species showed a tendency of decrease, and under moderate drought stress, Pn and Tr decreased more significantly, while the intercellular CO2 concentration ( Ci) increased. The diurnal variation curves of both Pn and Tr of T. hohenackeri displayed the two-peak pattern with a typical midday depression at 11:00 un-der different levels of drought stress, while Gs presented a single-peak curve. The diurnal variation of Pn of E. angustifo-lia displayed a single-peak curve, which was significantly higher in the morning than in the afternoon. Tr and Gs of two shrubs were displayed in two-peak pattern and positively correlated.