樹木の炭素蓄積率は,樹木の大きさとともに継続的に増加します
N L Stephenson1, A J Das1, R Condit2
1US Geological Survey, Western Ecological Research Center, Three Rivers, California 93271, USA.
Nature
|January 17, 2014
まとめ
大規模で古い木は,想定に反して,かなりの量の炭素を積極的に吸収します. 継続的な質量増加率は大きさに伴い増加し,森林の炭素循環と気候規制に不可欠です.
科学分野:
- 森林生態学 森林生態学とは
- 世界的な炭素サイクル研究
- 植物生理学 植物生理学
背景:
- 森林は,地球規模の炭素循環において重要な役割を果たし,大気中の温室効果ガスのレベルに影響を与えます.
- 森林の炭素動態の正確なモデリングには,複数のスケールでの生物学的プロセスを理解する必要があります.
- 樹木が大きくなり,年をとるにつれて,個々の樹木の生産性に関するコンセンサスの欠如があります.
研究 の 目的:
- 個々の木の質量成長率が木の大きさや年齢によってどのように変化するかを経験的に評価する.
- 木の成長パターンに関する矛盾する仮定を解決するために.
- 森林の炭素循環モデルと植物老化の理論を参考にするために.
主な方法:
- 403種類の熱帯および温帯の樹木種を総合分析した.
- 木の大きさと質量の成長率の関係を調べました.
- 樹木の成長における明らかなパラドックスを説明する研究された要因.
主要な成果:
- ほとんどの種では,木の大きさに伴い,木質の成長率は継続的に増加します.
- 大規模で古い木は,かなりの量の炭素を積極的に蓄積する.
- 単一の大きな木は,年当たり,中型の木と同じくらいの炭素を吸収することができる.
結論:
- 大型木は老朽化している貯水池だけでなく,炭素を吸収する重要な貯水池でもある.
- 葉の生産性が低下しているにも関わらず,葉面総面積の増加は,大きな木の成長を促します.
- 発見は,森林の炭素モデリング,資源配分理論,および植物老化の理解に影響を与える.
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