摘要
树皮、树叶和木质间的δ13 C有明显的差异 ,树皮最低 ,木质最高 .树木不同方位的δ13 C也有明显的不同 .但木质δ13 C随高度而没有不同 ,说明叶片通过光合作用合成的有机质在沿树干向下运输时不存在同位素的分馏效应 .近 6 0a来木质δ13 C有明显的降低趋势 ,而与树高和方位没有差异 .
C values in different organs are different. Tree leaves have the lowest, while tree trunks have the highest δ~ 13C value. δ~ 13C also varies with exposure, with a relatively lowest δ~ 13C value in the north. There is an inconsistent trend existing in wood δ~ 13C values of different height along the trunk, suggesting no carbon isotope discrimination during the period of the downward transportation of leaf's organic compounds. Irrespective of tree height and exposure, wood δ~ 13C values have become lower and lower for the past 60 years.
出处
《冰川冻土》
CSCD
北大核心
2002年第5期571-573,共3页
Journal of Glaciology and Geocryology
基金
中国科学院引进"国外杰出人才"项目
中国科学院知识创新工程重大项目 (KZCXl 10 0 6)
中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室知识创新项目 (2 10 5 0 6)资助
