Yang Tian-Tian, Zhang Wei-Wei, Hu En-Zhu, Wang Xiao-Ke, Tian Yuan, Feng Zhao-Zhong
Huan Jing Ke Xue. 2014 Oct;35(10):3896-902.
Numerous studies have indicated that rising ozone (O3) in the troposphere significantly decreased the photosynthesis and the activity of Rubisco enzyme. So it can be inferred that the N uptake and distribution within the plants could be affected by elevated O3. In this study, ten greening woody species, widely distributed in subtropical China, were exposed to charcoal-filtered air (CF, less than 20 nL · L(-1)) and elevated O3 (E-O3, mean concentration of 150 nL · L(-1)) in open top chambers. The results showed that E-O3 significantly reduced the leaves biomass in Liquidamba formosana by 20.9%, the stem biomass in Liriodendron chinense by 21.4%, the root biomass in L. formosana and L. chinense by 24.2% and 32.5%, respectively. E-O3 significantly affected the N concentration in the stem but not those in leaves and root. The N uptakes in the whole tree (Nlu), the leaves and the root were significantly affected by E-O3. Compared to CF, E-O3 significantly reduced the Nlu in L. chinense by 28.4% and Schima superba by 22.7% but significantly increased the Nlu in Neolitsea sericea by 15.5%. Elevated O3 concentration had no significant influence on N distribution within the plants across the selected 10 tree species.
大量研究表明，对流层中臭氧（O3）浓度升高会显著降低光合作用以及核酮糖-1,5-二磷酸羧化酶（Rubisco酶）的活性。因此可以推断，植物体内氮的吸收和分配可能会受到臭氧浓度升高的影响。在本研究中，将广泛分布于中国亚热带地区的10种绿化木本植物置于开顶式气室中，使其暴露于经过活性炭过滤的空气（CF，浓度低于20 nL·L⁻¹）和臭氧浓度升高（E - O3，平均浓度为150 nL·L⁻¹）的环境中。结果表明，E - O3使枫香的叶片生物量显著降低了20.9%，使鹅掌楸的茎生物量显著降低了21.4%，使枫香和鹅掌楸的根生物量分别显著降低了24.2%和32.5%。E - O3显著影响了茎中的氮浓度，但对叶和根中的氮浓度没有影响。整株树（Nlu）、叶片和根中的氮吸收量均受到E - O3的显著影响。与CF相比，E - O3使鹅掌楸的Nlu显著降低了28.4%，使木荷的Nlu显著降低了22.7%，但使舟山新木姜子的Nlu显著增加了15.5%。臭氧浓度升高对所选10种树种植物体内的氮分配没有显著影响。
