以亚热带常见树种米槠、木荷、浙江桂、罗浮栲、杉木和柑橘为对象,利用控制试验研究了温度对树木叶片甲烷(CH4)排放的影响.结果表明:当温度在10℃时,供试的6种树木中,仅木荷、柑橘和罗浮栲的叶片排放CH4；温度高于20℃时,所有树木叶片均可排放CH4.温度高于30℃时,叶片排放CH4的平均排放速率(1.010 ng CH4·g-1DM·h-1)是10～30℃时平均排放速率(0.255 ng CH4·g-1DM·h-1)的3.96倍.增温对柑橘和杉木CH4排放速率的影响显著高于其他4种树木.培养时间对叶片排放CH4速率有显著影响,温度胁迫对树木排放CH4的影响受植物活性的控制.在低温或高温条件下,树木干叶均不能排放CH4.高温胁迫对树木叶片排放CH4有重要影响,全球变暖可能增加植物的CH4排放.
Effects of temperature on CH4 emission from subtropical common tree species leaves
Laboratory incubation test was conducted to study the effects of temperature on the CH4 emission from the leaves of subtropical common tree species Castanopsis carlesii,Schima superb,Cinnamomum chekiangense,Castsanopsis fabri,Cunninghamia lanceolata,and Citrus reticulata.Among the six tree species,only S.superb,C.reticulate,and C.fabri emitted CH4 at 10 ℃.At above 20 ℃,all the six species emitted CH4,and the average CH4 emission rate at above 30 ℃ (1.010 ng CH4 · g-1 DM · h-1) was 2.96 times higher than that at 10-30 ℃ (0.255 ng CH4 · g-1 DM · h-1).Moreover,increasing temperature had much more effects on the CH4 emission rate of C.reticulata and C.lanceolata than on that of the other four tree species.Incubation time affected the CH4 emission rate of all test tree species significantly,suggesting that the effects of temperature stress on the CH4 emission could be controlled by plant activity.Dry leaves could not emit CH4 no matter the temperature was very high or low.It was suggested that high temperature stress had important effects on the CH4 emission from subtropical tree leaves,and global warming could increase the CH4 emission from plants.
high temperature stressCH4 emission rateplant leafsubtropics.
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NSTL
万方数据
维普
