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首页> 外文期刊>Geochemical Journal >Oxygen and carbon isotopic ratios of tree-ring cellulose in a conifer-hardwood mixed forest in northern Japan
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Oxygen and carbon isotopic ratios of tree-ring cellulose in a conifer-hardwood mixed forest in northern Japan

机译：日本北部针叶-阔叶混交林中年轮纤维素的氧碳同位素比

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摘要

Oxygen and carbon isotopic ratios (delta(18)O and delta(13)C) were analyzed for cellulose extracted from tree rings of 5 oak trees (Quercus crispula) and 4 fir trees (Abies sachalinensis) standing in a 1 ha plot of a sub-boreal conifer-hardwood mixed forest, northern Japan. The delta(18)O variations were well correlated between individual trees of Q. crispula (canopy trees) and A. sachalinensis (recently grown-up sub-canopy trees), although A. sachalinensis had about 1parts per thousand higher delta(18)O values than Q. crispula on average and there was an apparent one-year phase lag between delta(18)O variations of the two species. The similar inter-annual variation in delta(18)O among different individuals and species suggests a common environmental control. Contrary to delta(18)O, the inter-annual variations in delta(13)C did not possess any common trends among individual trees for either Q. crispula or A. sachalinesis, suggesting that the ecological effects. such as spatial heterogeneities in delta(13)C and/or concentration of CO2 in canopy air and/or competition for light with neighboring trees, regulate the delta(13)C of photosynthetic products in each tree. Seasonal variations of the delta(18)O and delta(13)C Within annual tree rings of Q. crispula showed random and cyclic characteristics, respectively. The difference between the annual patterns of delta(18)O and delta(13)C supports the idea that delta(18)O is controlled by some environmental factors, which change from year to year, but delta(13)C is primarily governed by physiological conditions of the tree itself, which repeat regularly in every growing season. The historical variation in delta(18)O of tree-ring cellulose in Q. crispula has negative correlations with those in both of winter and summer precipitation amounts, whereas it does not show any relationship with temperature, probably due to multiple source areas of water vapor for the precipitation at the studied area. Because the delta(18)O of precipitation in northern Japan is positively correlated with air temperature, the correlation between delta(18)O and winter precipitation suggests that, in a year of heavy snowfall, the soil in this forest retains larger amount of lower delta(18)O water derived from snowmelt, which is taken by roots of Q. crispula in summer. On the other hand, the negative correlation with summer precipitation cannot be elucidated by the delta(18)O of rainfall. but must be explained by a higher relative humidity in the growing season in a year of larger summer rainfall. Our results confirm the potential of delta(18)O of tree-ring cellulose to reconstruct past climate in a forest with a heavy snowfall, and suggest the importance of the hydrological knowledge in an atmosphere-soil-plant system for the utilization of tree-ring delta(18)O in paleoenvironmental purposes.
机译：分析了从5棵橡树（Quercus crispula）和4棵杉木树（Abies sachalinensis）的树的1公顷土地中提取的纤维素的氧和碳同位素比（delta（18）O和delta（13）C）。日本北部亚北方针叶树-阔叶混交林。 Q.crisula（冠层树）和A. sachalinensis（最近成年的亚冠层树）的单棵树之间的delta（18）O变异具有很好的相关性，尽管sachalinensis的每千个较高的delta约有1份（18） O值平均比Q. crispula高，并且两个物种的delta（18）O变异之间存在明显的一年相位滞后。在不同的个体和物种之间，delta（18）O的年际变化类似，这表明了对环境的共同控制。与三角洲（18）O相反，三角洲（13）C的年际变化在Q.crispula或A. sachalinesis的单棵树之间没有任何共同的趋势，这表明了生态效应。例如，δ（13）C中的空间异质性和/或冠层空气中的CO2浓度和/或与邻近树木的光照竞争，调节每棵树中光合产物的δ（13）C。 Q. crispula的年轮内的delta（18）O和delta（13）C的季节性变化分别显示出随机和周期性特征。 delta（18）O和delta（13）C的年度模式之间的差异支持以下观点：delta（18）O受某些环境因素控制，这些因素逐年变化，但主要控制delta（13）C取决于树木本身的生理状况，在每个生长季节都会定期重复。薄脆Q.树菌的年轮纤维素δ（18）O的历史变化与冬季和夏季降水量均呈负相关，而与温度没有任何关系，可能是由于多个水源区蒸气用于研究区域的沉淀。由于日本北部降水的delta（18）O与气温呈正相关，因此delta（18）O与冬季降水之间的相关性表明，在大降雪的一年中，该森林中的土壤保留了大量的较低的源自融雪的delta（18）O水，夏季被Q. crispula的根部吸收。另一方面，与降水的负相关不能通过降水的δ（18）O来阐明。但必须用一年中夏季降雨量较大的生长季节相对湿度较高来解释。我们的研究结果证实了树木年轮纤维素的delta（18）O可以重建大雪的森林中过去的气候的潜力，并表明在大气-土壤-植物系统中利用水文知识的重要性在古环境中环del（18）O。

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