摘要:为了探讨杉木幼苗叶片功能性状对全球气候变暖的响应与适应机制，在福建三明森林生态系统与全球变化研究站陈大观测点，设置大气增温（开顶箱被动增温，不增温）×土壤增温（电缆增温4℃，不增温）双因子试验，对杉木幼苗叶片生理代谢、形态属性、化学计量学特征等功能性状进行为期1年的研究。结果表明，虽然土壤增温和大气增温对4月和7月的叶片净光合作用速率和水分利用效率没有显著影响，但土壤增温对11月的叶片净光合作用速率有显著促进作用，而大气增温和土壤增温对11月的水分利用效率有显著促进作用。大气增温显著增加比叶面积和叶含水率，并降低叶厚度；而土壤增温则对其均没有显著影响。土壤增温、大气增温均显著增加杉木叶氮浓度，但只有同时大气增温和土壤增温处理才显著提高叶磷浓度。研究结论表明，从叶功能性状角度看，同时大气增温和土壤增温可能更有利于促进杉木幼苗生长。



Abstract:To understand how Cunninghamia lanceolata seedlings respond and adapt to extant and future climate conditions, a factorial air (ambient, open-top chamber (OTC)) and soil (ambient, +4 ℃) warming experiment was conducted at Chenda observing point of the Fujian Normal University's Forest Ecosystem and Global Change Research Station in Sanming, Fujian Province. We assessed the effects of warming on leaf functional traits of C. lanceolata seedlings. Air warming was implemented by OTC passive warming and soil warming by soil cable heating. The responses of leaf functional traits, including leaf photosynthetic characteristics, morphological traits, and stoichiometry of C. lanceolata seedlings, were examined during the one-year study. The results showed that there was no significant effect of both air warming and soil warming on leaf photosynthetic rates (Pn) and water use efficiency (WUE) in April and July, but Pn was increased significantly by soil warming in November. Both air warming and soil warming increased WUE in November. Air warming significantly increased specific leaf area and leaf water content, and decreased leaf thickness; however, there was no significant effect of soil warming on these traits. Both air and soil warming significantly increased leaf nitrogen (N) concentration, but only simultaneous air and soil warming treatments significantly increased leaf phosphorus (P) concentration. Thus, simultaneous air and soil warming treatments are more beneficial to the growth of C. lanceolata seedlings in terms of leaf functional traits.





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