摘要:为了探讨全球变暖对杉木幼苗地上物候和生长的影响，在福建三明森林生态系统与全球变化研究站陈大观测点开展大气温度控制（ambient，open-top chamber）和土壤温度控制（ambient，ambient+4℃）双因子试验，设置对照、单独大气增温、单独土壤增温、大气和土壤同时增温4种处理，大气增温采用开顶箱被动式增温，土壤增温采用电缆增温。建立48个单株水平的根箱，每个根箱内种植1棵1年生2代半短侧枝杉木幼苗，于2016年开始对杉木幼苗地上物候和生长动态进行为期1年的研究。结果表明：（1）大气温度控制对杉木幼苗物候和生长具有显著影响；与无大气增温相比，大气增温使杉木幼苗顶芽膨胀、顶芽展开和顶芽新稍生长时间显著提前，树高生长季长度显著延长，杉木幼苗树高生长得到显著促进。（2）土壤温度控制对杉木幼苗的物候和生长均没有显著影响。（3）大气温度控制和土壤温度控制的交互作用对杉木幼苗生长具有显著影响，大气和土壤同时增温处理的杉木幼苗树高和侧枝生长显著大于单独大气增温处理。表明全球气候变暖可能对杉木生产力具有一定的促进作用。



Abstract:A probe into the influence of global warming on the phenology and growth of Cunninghamia lanceolata seedlings was conducted in order to understand how C. lanceolata plantations may respond and adapt to the future climate in a humid subtropic area. In Fujian Normal University's Forest Ecosystem and Global Change Research Station in Chenda, Sanming, Fujian Province, a factorial air temperature manipulation (AT; ambient, open-top chamber)×soil temperature manipulation (ST; ambient, ambient+4℃) which included four treatments, i.e., control, air warming, soil warming, air and soil warming, was carried out. Air temperature manipulations were implemented by the open-top chamber method and soil temperature manipulations were implemented by soil cable heating. In 2016, 48 root boxes were built and each planted with one 1-year-old C. lanceolata seedling, to examine phenology and growth dynamics. The results showed that air temperature manipulations had significant effects on both shoot phenology and growth of the seedlings. Air warming significantly advanced the timing of apical bud swelling, apical bud break and apical bud new shoot growth, as well as significantly prolonged growing season length and promoted tree height growth. Soil temperature manipulation had no significant effect on either shoot phenology or growth of the seedlings. There were significant interactive effects of air and soil temperature manipulation on growth. Simultaneous air and soil warming promoted tree height and lateral branch growth more than individual warming treatments. We concluded that climate warming would benefit the growth of C. lanceolata plantations to some extent.





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