Springtime resumption of photosynthesis in balsam fir (Abies balsamea)
Springtime resumption of photosynthesis in balsam fir (Abies balsamea)
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DOI：
10.1093/treephys/28.7.1069
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发表时间：
2008-07-01
期刊：
影响因子：
4
通讯作者：
Krasowski, M. J.
中科院分区：
文献类型：
--
作者：
Goodine, G. K.;Lavigne, M. B.;Krasowski, M. J.
苦瓜冷杉（Abies balsamea (L.)）光合作用的研究Mill.)于2004年和2005年冬末至春末在加拿大新不伦瑞克省的两个地点进行了实地测量。当整个生根区土壤保持在0℃以下时，没有检测到光合作用。在这两年里，一旦土壤温度上升到0摄氏度，光合作用就会开始。在生长室内的盆栽幼苗中，如果盆栽被冷冻，在10摄氏度的空气温度下就不会发生光合作用。这些发现表明，一旦气温允许光合作用，就会有解冻的土壤水触发光合作用的开始。在田间，土壤解冻后光合能力的完全恢复取决于气温，2005年需要5周，2004年需要10周。在2004年的恢复期有两次严重的霜冻事件，这可能解释了恢复期的延长。2005年，土壤解冻开始后，在0℃以上积累200个生长期，恢复完成。
Photosynthesis in balsam fir (Abies balsamea (L.) Mill.) was measured in the field at two locations in New Brunswick, Canada from late winter to late spring in 2004 and 2005. No photosynthesis was detectable while the soil remained below 0 degrees C throughout the rooting zone. In both years, photosynthesis began once soil temperature rose to 0 degrees C. In potted seedlings in growth chambers, there was no photosynthesis at an air temperature of 10 degrees C if the pots were frozen. These findings suggest that, once air temperatures permit photosynthesis, it is the availability of unfrozen soil water that triggers the onset of photosynthesis. In the field, full recovery of photosynthetic capacity following the onset of soil thaw was dependent on air temperature and took 5 weeks in 2005, but 10 weeks in 2004. There were two substantial frost events during the recovery period in 2004 that may explain the extended recovery period. In 2005, recovery was complete after the accumulation of 200 growing degree days above 0 degrees C after the start of soil thaw.