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通过对暖温带落叶阔叶林生态系统主要乔、灌木植物叶片、树干、花、果实碳稳定性同位素比率 (δ13 C值 )测定和比较 ,发现这些植物叶片的δ13 C值受多种因子的影响 ,具有较大的种间差异及时空异质性 .主要表现在不同植物δ13 C值不同 ;种内δ13 C值变化也很大 ,以荆条的差异最大 ,为 6.5 49‰ ( -2 2 .2 2 6‰～ -2 8.775‰ ) ;其次是大叶白蜡 5 .70 6‰ ( -2 3 .687‰～ -2 9.3 93‰ ) ;核桃楸 5 .2 2 9‰ ( -2 6.14 6‰～ -3 1.3 75‰ ) ;辽东栎3 .3 3 3‰ ( -2 4.3 2 4‰～ -2 7.65 7‰ ) ;北京丁香 2 .414‰ ( -2 5 .65 5‰～ -2 8.0 70‰ ) ,山杏δ13 C值的种内差异最小 ,为 2 .2 96‰ ( -2 3 .43 6‰～ -2 6.43 2‰ ) .同种植物的不同器官的δ13 C值也存在差异 ,皮的δ13 C值低 ,木质部的δ13 C值高 .通过对山杏树干木质部δ13 C值与环境因子的分析发现 ,年平均温度和山生杏木质部δ13 C值的大小最为密切 ,其次分别是年降水量、生长季平均温度和生长季降水量 .
The δ13C values of leaves, trunks, flowers and fruits in the warm-temperate deciduous broad-leaved forest ecosystem were determined by comparing with the δ13C values of the main plant species in the deciduous broad-leaved forest ecosystems. The δ13C values of these plants were affected by many factors , With greater interspecific differences and temporal and spatial heterogeneity, mainly manifested in different δ13C values of different plants; δ13C values within the species also vary greatly, with the strongest differences between the Vitex negundo, 6.5 49 ‰ (-2 2 .2 2 6 ‰ ~ -2 8.775 ‰); followed by the large leaf ash 5 .70 6 ‰ (-2 3 .687 ‰ -2 9.3 93 ‰); Juglans mandshurica 5.222 ‰ (-2 6.14 6 ‰ ~ -3 1.3 75 ‰); Quercus liaotungensis 3 .3 3 3 ‰ (-2 4.3 2 4 ‰ -2 7.65 7 ‰); Beijing clove 2 .414 ‰ (-2.5655 ‰ -2 8.0 70 ‰ ), The smallest intraspecific difference of δ13C value of Armeniaca sibirica was2.296 ‰ (-23.443 6 ‰ -2 6.43 2 ‰) .The δ13C values of different organs of the same plant were also different Had a lower δ13C value and a higher δ13C value in xylem.By analyzing the δ13C value of xylem and the environmental factors, the annual average temperature and the δ13C value of xylem in ShanXingXing were the most close, followed by year Precipitation, average growing season temperature and growing season precipitation.