Responses of leaf nitrogen and mobile carbohydrates in different Quercus species/provenances to moderate climate changes
Responses of leaf nitrogen and mobile carbohydrates in different Quercus species/provenances to moderate climate changes
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DOI：
10.1111/j.1438-8677.2012.00579.x
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Rigling, A.
中科院分区：
文献类型：
--
作者：
Li, M. -H.;Cherubini, P.;Rigling, A.
全球变暖和缺水已经在最近的过去得到了证明，并在未来得到了预测。气候变化将不可避免地对植物生理、生长、生产力和森林生态系统功能产生相当大的影响。本研究测定了模拟白天气温升高(生长季+1至1.5摄氏度)、干旱(分别是2007年和2008年生长季728毫米平均降雨量的-40%和-57%)及其组合对瑞士两种土壤中生长的两种栎树(Q.robur和Q.Petraea)和种源(每个物种两个种源)叶氮(N)和非结构性碳水化合物(NSC)的影响。为了验证这样一种假设，即与耐旱性较强的物种(Q.petraea)或种源相比，对水分更敏感的物种(Q.robur)和种源(起源于富水地区)的叶片N和NSC将对全球变暖和缺水做出更强烈的反应。在叶片N和NSC中没有发现物种和种源对气候处理的特定反应，这表明结果不支持我们的假设。叶片N和NSC浓度的种间差异主要反映了两种植物的生物学差异，而N和NSC浓度的种间差异明显反映了其起源的气候。因此，我们得出的结论是：(I)由于所研究的两个栎属树种的地理和气候分布范围很广，它们对瑞士境内的温和气候变化不太敏感，以及(Ii)全球变暖为B1情景(IPCC 2007)不会或至少不会对栓皮栎和栓皮栎的氮和碳生理产生负面影响。
Global warming and shortage of water have been evidenced in the recent past and are predicted for the future. Climate change will inevitably have considerable impact on plant physiology, growth, productivity and forest ecosystem functions. The present study determined the effects of simulated daytime air warming (+1 to 1.5 degrees C during the growing season), drought (-40% and -57% of mean precipitation of 728 mm during the 2007 and 2008 growing season, respectively) and their combination, on leaf nitrogen (N) and non-structural carbohydrates (NSC) of two Quercus species (Q. robur and Q. petraea) and provenances (two provenances for each species) grown in two soil types in Switzerland across two treatment years, to test the hypothesis that leaf N and NSC in the more water-sensitive species (Q. robur) and provenances (originating from water-rich locations) will more strongly respond to global warming and water deficit, compared to those in the more drought-tolerant species (Q. petraea) or provenances. No species-and provenance-specific responses in leaf N and NSC to the climate treatment were found, indicating that the results failed to support our hypothesis. The between-species variation of leaf N and NSC concentrations mainly reflected differences in biology of the two species, and the between-provenance variation of N and NSC concentrations apparently mirrored the climate of their origins. Hence, we conclude that (i) the two Quercus species studied are somewhat insensitive, due to their distribution covering a wide geographical and climate range, to moderate climate change within Switzerland, and (ii) a moderate global warming of B1 scenario (IPCC 2007) will not, or at least less, negatively affect the N and carbon physiology in Q. robur and Q. petraea.