胡杨叶片的胞间CO_(2)浓度及气孔和非气孔限制的探究  

Study on the intercellular CO_(2) concentration and stomatal limitation and non-stomata limitation of Populus euphratica leaves

作　　者：林兵 武胜利[1] 管文轲[2] 宋川 史智欣 何宇翔 岳永江 LIN Bing;WU Sheng-li;GUAN Wen-ke;SONG Chuan;SHI Zhi-xin;HE Yu-xiang;YUE Yong-jiang(School of Geography and Tourism,Xinjiang Normal University,Urumqi830054,China;Xinjiang Academy of Forestry Sciences,Urumqi830018,China)

机构地区：[1]新疆师范大学地理科学与旅游学院,乌鲁木齐830054 [2]新疆林业科学院,乌鲁木齐830018

出　　处：《湖北农业科学》2021年第13期87-92,共6页Hubei Agricultural Sciences

基　　金：新疆维吾尔自治区林业厅科技支撑专项“塔里木河中下游胡杨林更新复壮关键技术研究”(HY-2.3)。

摘　　要：通过LI-6400型便携式光合仪(LI-COR,USA)测量生长在极端干旱区塔里木河荒漠沿岸天然胡杨(Populus euphratica Oliv.)的光合生理参数,在分析胡杨叶片胞间CO_(2)浓度动态变化规律的基础上,进一步讨论探究了胡杨的气孔限制和非气孔限制情况。结果表明,生长季内胡杨叶片的胞间CO_(2)浓度变化呈“V”型的变化趋势,最低值均出现在14:00。胡杨胞间CO_(2)浓度随影响因素包括大气CO_(2)浓度、气孔导度、净光合速率和蒸腾速率的变化而同步变化:与大气CO_(2)浓度的变化规律基本保持一致;与气孔导度、净光合速率和蒸腾速率的变化规律相反,呈负相关。胡杨叶片气孔限制值Ls变化规律呈先增加后下降的变化趋势,具体表现为早上和晚上低、中午高。非气孔限制指标Ci/Gs与Ls变化规律相反。胡杨的净光合速率下降是以非气孔限制为主,但不能排除气孔限制作用,同理,当净光合速率下降是非气孔限制为主,也不能排除非气孔限制作用;结合气孔限制值Ls和非气孔限制的两个判断依据可以进一步了解胡杨气孔限制和非气孔限制情况。The LI-6400 portable photosynthetic instrument(LI-COR,USA)was used to measure the photosynthetic physiological parameters of Populus euphratica growing in the extreme arid area along the Tarim River.Based on the analysis of the dynamic changes of the intercellular CO_(2)concentration of P.euphratica,the stomata limitation and non-stomata limitation of P.euphratica were further discussed and explored.The results showed,the intercellular CO_(2)concentration of P.euphratica leaves in the growing season showed a“V”-shaped change trend,and the lowest values??all appeared at 14:00.The intercellular CO_(2)concentration of P.euphratica changed synchronously with changes in influencing factors including external CO_(2)concentration,stomatal conductance,net photosynthetic rate and transpiration rate:it was basically consistent with the change law of external CO_(2)concentration;It was opposite to the change law of stomatal conductance,net photosynthetic rate and transpiration rate,showing a negative correlation.The change law of the stomatal limit value Ls of P.euphratica leaves showed a trend of first increasing and then decreasing,which was lower in the morning and evening and higher at noon.The non-stomata limitation index Ci/Gs and stomata limitation Ls change in the opposite way.The decline of P.euphratica net photosynthesis rate was mainly due to non-stomata limitation,but the effect of stoma limitation cannot be ruled out.Similarly,when the net photosynthesis rate decline was mainly due to non-stomata limitation,it cannot be ruled out.Combining the two judgment basis of stomata limitation value Ls and non-stomata limitation can further understand P.euphratica stoma limitation and non-stomata limitation.

关 键 词：胡杨(Populus euphratica Oliv.) 胞间CO_(2)浓度 光合作用 气孔限制 非气孔限制 

分 类 号：S792.11[农业科学—林木遗传育种]