Photosynthesis acclimation, leaf nitrogen concentration, and growth of four tree species over 3 years in response to elevated carbon dioxide and nitrogen treatment in subtropical China
Photosynthesis acclimation, leaf nitrogen concentration, and growth of four tree species over 3 years in response to elevated carbon dioxide and nitrogen treatment in subtropical China
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中国亚热带地区四种树种三年内光合作用驯化、叶片氮浓度和生长对二氧化碳和氮升高处理的响应
DOI：
10.1007/s11368-011-0398-4
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发表时间：
2011-10-01
影响因子：
3.6
通讯作者：
Zhang, Deqiang
中科院分区：
文献类型：
--
作者：
Liu, Juxiu;Zhou, Guoyi;Zhang, Deqiang
迄今为止，有关植物对CO2浓度升高的光合适应反应的研究大多集中在自然条件下氮素限制和环境氮沉降较低的温带地区。目前还不清楚光合下调是否减轻增加氮的可用性，例如，从增加的N沉积由于化石燃料燃烧在热带和亚热带。了解植物光合作用对CO2浓度升高的响应有助于更好地理解和预测全球变化下的未来森林生产力。等冠军，红豆Ormosia pinnata（Lour.）Merr、红锥Castanopsis hystrix AC.华盛顿，和Acmena acuminatissima（Blume）Merr. et佩里暴露于大气CO（2）浓度（环境和升高的CO（2）浓度）的因子组合。700 μ mol CO（2）mol（-1））和氮沉降（环境和环境+ 100 kg N ha（-1）年（-1））。结果表明，CO2处理对高氮处理下所有树种的光饱和净光合速率、叶片氮浓度和树体生长没有影响。然而，S. 2006年12月和2007年11月（施氮后20个月和31个月），低氮处理（环境）下木荷的净光合速率分别比高浓度下高23%和47%; 2006年7月，生长在低氮处理下的acuminatissima在环境CO2浓度下的净光合作用比生长在高CO2浓度下的高173%、26%和121（治疗后16个月），2006年12月（20个月）和2007年11月（31个月），而在2007年11月，C. hystrix和O.羽片。随着S. superba和A. CO（2）浓度升高显著降低了尖叶松叶片N浓度。superba和A.低N处理的尖叶锦鸡儿（C. acuminatissima）的生长状况与低N处理的差异显著。在全球气候变化，特别是CO2浓度升高的情况下，红蜘蛛可能是一个很好的固碳物种。结果表明，在热带和亚热带地区，不同树种和功能类型对CO2浓度升高和氮处理的相对响应不同。
Up to date, most studies about the plant photosynthetic acclimation responses to elevated carbon dioxide (CO(2)) concentration have been performed in temperate areas, which are often N limited under natural conditions and with low ambient N deposition. It is unclear whether photosynthetic downregulation is alleviated with increased N availability, for example, from increased N deposition due to fossil fuel combustion in the tropics and subtropics. Awareness of plant photosynthetic responses to elevated CO(2) concentration will contribute to the better understanding and prediction of future forest productivity under global change.Four tree species, Schima superba Gardn. et Champ., Ormosia pinnata (Lour.) Merr, Castanopsis hystrix AC. DC., and Acmena acuminatissima (Blume) Merr. et Perry were exposed to a factorial combination of atmospheric CO(2) concentration (ambient and elevated CO(2) concentration at ca. 700 mu mol CO(2) mol(-1)) and N deposition (ambient and ambient + 100 kg N ha(-1) year(-1)) in open-top chambers in southern China for 3 years since March 2005. Light-saturated net photosynthetic rate, leaf N concentration, and tree growth of all species were measured.The CO(2) treatments did not affect light-saturated net photosynthetic rate of all species grown with the high N treatment. However, S. superba grown with the low N treatment (ambient) had 23% and 47% greater net photosynthesis in the ambient CO(2) concentration than those in the elevated CO(2) concentration for December 2006 and November 2007 (20 and 31 months after the treatments were applied), respectively, and A. acuminatissima grown with the low N treatment had 173%, 26%, and 121% greater net photosynthesis in trees grown in the ambient CO(2) concentration than those in the elevated CO(2) concentration for July 2006 (16 months after the treatments), December 2006 (20 months), and November 2007 (31 months), respectively, whereas, photosynthetic acclimation was not found for C. hystrix and O. pinnata. With the photosynthetic acclimation of S. superba and A. acuminatissima, we also found that the elevated CO(2) concentration decreased significantly leaf N concentration in trees of S. superba and A. acuminatissima grown with the low N treatment, respectively.C. hystrix seems to be a good species for C fixation under global climate change, particularly with the rising CO(2) concentration. We demonstrated that the relative responses to elevated CO(2) concentration and N treatment differ among tree species and functional types in the tropical and subtropical areas.