Ten-year exposure to elevated CO2 increases stomatal number of Pinuskoraiensis and P.sylvestriformis needles
Ten-year exposure to elevated CO2 increases stomatal number of Pinuskoraiensis and P.sylvestriformis needles
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DOI：
10.1007/s10342-013-0728-8
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发表时间：
2013-08
影响因子：
2.8
通讯作者：
Yumei Zhou;Xiaojie Jiang;M. Schaub;Xuejuan Wang;Jianqiu Han;Shi-jie Han;Maihe Li
中科院分区：
文献类型：
--
作者：
Yumei Zhou;Xiaojie Jiang;M. Schaub;Xuejuan Wang;Jianqiu Han;Shi-jie Han;Maihe Li
气孔数和气孔导度是CO2浓度升高条件下植物碳同化和水分利用的重要结构和功能参数。研究了10年（1999-2009年）高浓度CO2（500 μmol mol− 1CO 2）对樟子松和红松针叶气孔密度、气孔行数和气孔导度的影响。CO2浓度升高使气孔密度增加。sylvestriformis的气孔行数比对照少10.8%（远轴面少13.5%，近轴面少8.0%）; koraiensis7.9%（1年生针叶5.0%，当年生针叶10.7%）。增加气孔密度P. sylvestriformis和气孔行数。koraiensis表明，CO2浓度升高增加气孔数在两个树种。针叶年龄对红松气孔密度和气孔行数有显著影响，而对樟子松无显著影响。对于这两个物种，CO2浓度升高并没有显着影响气孔导度，但增加了水分利用效率。气孔数的增加并不伴随着气孔导度在CO2浓度升高的显着变化，这两个树种表明，气孔导度和气孔数之间可能没有直接的关系。
Stomatal number and stomatal conductance are important structural and functional parameters for the assessment of carbon assimilation and water use under elevated CO2. We studied stomatal density, number of stomatal rows and stomatal conductance ofPinussylvestriformisandP.koraiensisneedles exposed to elevated CO2(500 μmol mol−1CO2) in open-top chambers for 10 years (1999–2009). Elevated CO2increased stomatal density onP. sylvestriformisby 10.8 % (13.5 % on abaxial surface and 8.0 % on adaxial surface) and the number of stomatal rows onP. koraiensisby 7.9 % (5.0 % in 1-year-old needles and 10.7 % in current-year needles). Increased stomatal density forP. sylvestriformisand number of stomatal rows forP. koraiensisindicate that elevated CO2increases stomatal number in both tree species. Needle age significantly influenced stomatal density and number of stomatal rows inP.koraiensisbut not inP.sylvestriformis. For both species, elevated CO2did not significantly affect stomatal conductance but increased water use efficiency. The increase in stomatal number is not accompanied by significant changes in stomatal conductance at elevated CO2for both tree species suggesting that there may be no direct relationship between stomatal conductance and stomatal numbers.