Interannual variation in carbon uptake by vegetation of Taiga in Eastern Siberia and its response to global warming

东西伯利亚针叶林植被碳吸收的年际变化及其对全球变暖的响应

• 批准号: 16403011
• 负责人: SUGIMOTO Atsuko
• 金额: $ 8.68万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16403011/
• 关键词: carbon cycle; Taiga; permafrost; water cycle; photosynthesis; interannual variation; ecosystem; production; 炭素循環

Terrestrial ecosystem on permafrost in Eastern Siberia shows large interannual variation depending on moisture condition. In order to observe the variation observations on soil moisture and vegetation were carried out at Spasskaya Pad Experimental Forest near Yakutsk. Soil moisture varied depending on the balance between precipitation and transpiration. Runoff was negligible usually, however, analysis of soil moisture budget suggested that it probably occurred in extremely wet condition. The isotopic composition of soil and sap water showed that during drought soil water in lower part of active layer was transported upward and used for transpiration, while under wet condition rainwater infiltrated and taken up by plants.Vegetation responds to the soil moisture. Photosynthetic activity of larch needle was relatively constant every year, which is elucidated by constant availability of soil moisture supplied from snow thaw. On the other hand, that in latter half of summer was limited during drought. GBH increment of larch also showed correlation with the soil moisture at the year. Carbon isotope ratio of larch needles showed negative correlation with the soil moisture in the late summer of the previous year, indicating that carbon taken up by photosynthesis once stored then used for needle production in the following year. Results in 13C tracer experiments also supported this. Needle litter fall production increased with two-year time-lag from the increase in soil moisture, which was elucidated by the favorable conditions in the late summer of the previous year on the soil moisture carried over and radiation.

东西伯利亚多年冻土上的陆地生态系统表现出很大的年际变化，这取决于水分条件。为了观察土壤水分和植被的变化，在雅库茨克附近的斯帕斯卡亚帕德实验林进行了观测。土壤水分的变化取决于降水和蒸腾作用之间的平衡。径流通常可以忽略不计，然而，对土壤水分收支的分析表明，径流很可能发生在极端潮湿的条件下。土壤和树液水的同位素组成表明，干旱条件下，活跃层下部的土壤水分被向上输送用于蒸腾，而在潮湿条件下，雨水被植物渗入和吸收，植被对土壤水分做出反应。落叶松针叶的光合作用活性年内相对恒定，这是由融雪提供的土壤水分的恒定有效性来解释的。另一方面，由于干旱，后半夏的气候变化有限。落叶松GBH生长量与当年土壤水分呈正相关。落叶松针叶碳同位素值与前一年夏末土壤水分呈负相关，说明光合作用吸收的碳一旦储存起来，第二年就被用于针叶生产。13C示踪剂实验的结果也支持这一点。针叶枯落物产量的增加与土壤水分的增加有两年的滞后性，这可以从前一年夏末土壤水分携带和辐射的有利条件来解释。

项目成果

Hydrologic processes of permafrost in Eastern Siberia observed in water isotopes of soil moisture and Lena river water

通过土壤水分和勒拿河水的水同位素观测到东西伯利亚多年冻土的水文过程

• 发表时间: 2005
• 作者: Sugimoto;A.;Maximov;T. C.
• 通讯作者: T. C.

炭素・酸素安定同位体比を利用した東シベリアタイガ林における土壌CO2の挙動に関する研究

利用碳氧稳定同位素比研究东西伯利亚针叶林土壤二氧化碳行为

• 发表时间: 2006
• 作者: 櫛引令子;杉本敦子;T. C. Maximov
• 通讯作者: T. C. Maximov

Carbon Allocation of ^<13>CO_2-labeled Photoassimilate in Larix gmelinii Saplings - A Physiological Basis for Isotope Dendroclimatology in Eastern Siberia

^<13>CO_2标记的光同化物在落叶松树苗中的碳分配——东西伯利亚同位素树木气候学的生理基础

• 发表时间: 2006
• 作者: Kagawa;A.;Sugimoto;A.;Maximov;T.
• 通讯作者: T.

Temporal photosynthetic carbon isotope signatures revealed in a tree ring through ^<13>CO_2 pulse-labeling

通过 ^<13>CO_2 脉冲标记揭示树木年轮中的时间光合碳同位素特征

• 发表时间: 2005
• 期刊: Plant, Cell and Environment 28
• 作者: Kagawa;A.;Sugimoto;A.;and Abe;H.
• 通讯作者: H.

Recycling of precipitation in Eastern Siberia observed with stable isotopic composition of precipitation and atmospheric water vapor

通过降水和大气水汽的稳定同位素组成观察东西伯利亚降水的循环

• 发表时间: 2007
• 作者: Ueta;A.;Sugimoto;A.
• 通讯作者: A.