胡杨雌雄株冠层光合速率日变化差异及主要影响因子  

The Diurnal Variation of Photosynthetic Rate in Male and Female Canopy of Populus euphratica Oliv. and Its Main Influencing Factors

作　　者：张晋龙 李小东 翟军团 李秀 李志军 

机构地区：[1]塔里木盆地生物资源保护利用兵团重点实验室,新疆 阿拉尔 [2]塔里木大学生命科学与技术学院,新疆 阿拉尔 [3]塔里木大学胡杨研究中心,新疆 阿拉尔

出　　处：《植物学研究》2022年第2期115-128,共14页Botanical Research

摘　　要：以胡杨为试材,使用Li-6400便携式光合作用仪,测定了不同冠层高度下胡杨雌雄株光合参数的日变化,应用相关分析、回归分析,研究净光合速率与生理、环境因子间的关系,为植物生长调控提供理论依据。结果表明:① 胡杨雌雄株、蒸腾速率Tr与气孔限制值Ls的变化趋势均为单峰曲线,胞间二氧化碳浓度Ci日变化呈现“V”字型,水分利用效率WUE呈现上下波动趋势,胡杨雌雄株气孔导度Gs因不同冠层而表现出“单峰”型和“双峰”型两种趋势,净光合速率Pn日变化与Gs同步,峰值均出现在11:30,而Tr峰值滞后Pn、Gs2h。② 胡杨雌雄株的Pn、Gs、Ci、Tr均随着冠层的升高而增加,WUE、Ls均随着冠层的升高而减少,在11:30和15:30,胡杨雌雄冠层2 m与10 m的Gs、WUE、Tr、Ls有显著差异。③ 胡杨雌雄株对各生理因子和环境因子的响应有所不同,胡杨雌株叶片的光合作用受生理因子和生态因子的影响比雄株更显著。④ 对胡杨雌株Pn的促进作用最大的是光合有效辐射PAR,对胡杨雄株Pn的促进作用最大的是空气温度Tair;对胡杨雌雄株Tr促进作用最大的均是Tair;对胡杨雌株Ci的抑制作用最大的是PAR,对胡杨雄株Ci的抑制作用最大的是Tair;对胡杨雌株Gs的促进作用最大的是Tair,3个环境因子均对胡杨雄株Gs无显著影响。PAR是影响胡杨雌株叶片净光合速率最主要的环境因子;Tair是影响胡杨雄株叶片净光合速率最主要的环境因子。Taking Populus euphratica Oliv. as the test material, the Li-6400 portable photosynthesis instrument was used to measure the diurnal changes of photosynthetic parameters of male and female Populus euphratica plants under different canopy heights. Correlation analysis and regression analysis were used to study the relationship between net photosynthetic rate and physiological and environmental factors. In order to provide theoretical basis for plant growth regulation, the results showed that: ① The change trends of Pn, Tr and Ls of male and female plants of Populus euphratica were all unimodal curves, the daily variation of Ci showed a “V” shape, and WUE showed a trend of up and down fluctuations. Gs showed two trends of “single-peak” and “double-peak” due to different canopy heights. The diurnal variation of Pn was synchronized with Gs, and both peaks appear at 11:30, while the peak of Tr lags behind Pn and Gs for 2 h. ② Pn, Gs, Ci, and Tr of male and female Populus euphratica all increased with the increase of the canopy heights, while WUE and Ls decreased with the increase of the canopy heights. At 11:30 and 15:30, there were significant differences in Gs, WUE, Tr and Ls between male and female canopies of 2 m and 10 m in Populus euphratica. ③ The responses of male and female plants of Populus euphratica to various physiological and environmental factors were different. The photosynthesis of leaves of female Populus euphratica plants was more significantly affected by physiological and environmental factors than that of male plants. ④ PAR was the most promoting effect on Pn in female Populus euphratica, and Tair was the most promoting effect on Pn in male Populus euphratica;Tair was the most promoting effect on Tr in both male and female plants;PAR was the most inhibitory effect on Ci of female Populus euphratica, and Tair was the most inhibitory effect on Ci of male Populus euphratica;Tair has the greatest promoting effect on Gs in female Populus euphratica. All three environmental factors

关 键 词：胡杨 光合日变化 冠层 雌雄 

分 类 号：S792.11[农业科学—林木遗传育种]