CAJ | 학술논문

为了探究沙生植物对水分的响应机制和对水分、光能利用效率,以沙坡头地区3种常见的典型沙生植物柠条(Caragana korshinskii )、油蒿(Artemisia ordosica )、沙木蓼(Atraphaxis bracteata )为研究对象,用 Li-6400便携式光合测定仪测定3种植物的净光合速率(Pn)和蒸腾速率(E),并分析各自的水分利用效率(WUE)和光能利用效率(LUE).结果表明,3种沙生植物的 Pn日变化曲线都是双峰型,有明显的光合午休现象.E日变化曲线,柠条呈单峰型,油蒿和沙木蓼呈双峰型.柠条和油蒿的 WUE日变化曲线均为双峰型,而沙木蓼的 WUE日变化比较平缓. LUE日变化曲线,柠条和油蒿都是倒抛物线型,早晨和傍晚较高,而沙木蓼的 LUE曲线呈平缓型.说明沙木蓼和柠条、油蒿的生存策略不同,沙木蓼是高耗水植物,依靠强烈的蒸腾作用避免高温的伤害,使得光合作用保持较高水平.因此,柠条和油蒿比沙木蓼更能适应沙区的干旱环境,是恢复植被、防风固沙的优良物种.
위료탐구사생식물대수분적향응궤제화대수분、광능이용효솔,이사파두지구3충상견적전형사생식물저조(Caragana korshinskii )、유호(Artemisia ordosica )、사목료(Atraphaxis bracteata )위연구대상,용 Li-6400편휴식광합측정의측정3충식물적정광합속솔(Pn)화증등속솔(E),병분석각자적수분이용효솔(WUE)화광능이용효솔(LUE).결과표명,3충사생식물적 Pn일변화곡선도시쌍봉형,유명현적광합오휴현상.E일변화곡선,저조정단봉형,유호화사목료정쌍봉형.저조화유호적 WUE일변화곡선균위쌍봉형,이사목료적 WUE일변화비교평완. LUE일변화곡선,저조화유호도시도포물선형,조신화방만교고,이사목료적 LUE곡선정평완형.설명사목료화저조、유호적생존책략불동,사목료시고모수식물,의고강렬적증등작용피면고온적상해,사득광합작용보지교고수평.인차,저조화유호비사목료경능괄응사구적간한배경,시회복식피、방풍고사적우량물충.
In order to explore the sand plant’response mechanism to water and the utilization rate of water and light,3 kinds of typical psammophyte,Caragana korshinskii ,Artemisia ordosica ,Atraphaxis bracteata ,in Shapotou area in Tengger Desert were chosen as the research object,measured their net photo-synthetic rate (Pn )and transpiration rate (E )with Li-6400 portable photosynthesis system,and analyzed their water use efficiency (WUE )and light use efficiency (LUE ).The results indicated that the diurnal variation of Pn curves of 3 species of plants were two-peak pattern,had obvious midday depression of pho-tosynthesis,the peaks occurred at 9∶00 and 17∶00,trough at 13∶00,Pn daily average,A.bracteata (13.54μmol/(m2 ·s)was about 2.5 times as C.korshinskii (5.43 μmol/(m2 ·s)and 2.3 times as A.ordosica (5. 85 μmol/(m2 ·s).Curve of E diurnal variation of transpiration rate of C.korshinskii ,was single peak pat-tern,A.ordosica and A.bracteata were two-peak pattern,the daily average E A .bracteata was about 2 times as C.korshinskii (3.34 mmol/(m2 ·s-)and A.ordosica (3.61 mmol/(m2 ·s).The WUE curve of di-urnal variation of C.korshinskii and A.ordosica were two-peak pattern,reached peaks at 9∶00 (3.21 mmol/mol,∶A.ordosica∶ 2.95 mmol/mol)and 17∶00,trough at 13∶00;and the WUE curve of diurnal variation of sand was made smooth type.The curve of diurnal variation of LUE ,∶C.korshinskii∶ and ∶A.ordosica∶was inverted parabolic,level in the morning and evening was higher and the trough occurs at 13∶00.The highest value of C.korshinskii (0.0437 mol/mol)was 10 times higher than the lowest level at noon and of A.ordosica (0.028 2 mol/mol)was 5 times higher than the lowest level at noon.The LUE curve of A. bracteata was smooth,the daily average value reached 0.0226 mol/mol.The survival strategies of A. bracteata and C.korshinskii ,A.ordosica were of great difference,relying on strong transpiration to avoid heat damage,the photosynthesis of A.bracteata remained at a high level,so as to improve the utilization ef-ficiency of light.Therefore,C.korshinskii ,and A.ordosica could adapt to the drought environment of sandy area more than A.bracteata ,as the excellent species of vegetation restoration,windbreak and sand fixation.