English  |  正體中文  |  简体中文  |  Items with full text/Total items : 43312/67235
Visitors : 2149986      Online Users : 4
RC Version 5.0 © Powered By DSPACE, MIT. Enhanced by NTU/NCHU Library IR team.

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/133515

標題: After trees die: quantities and determinants of necromass across Amazonia
作者: Chao, K.J.;Phillips, O.L.;Baker, T.R.;Peacock, J.;Lopez-Gonzalez, G.;Martinez, R.V.;Monteagudo, A.;Torres-Lezama, A.
關鍵字: coarse woody debris;aboveground live biomass;eastern brazilian-amazon;net primary production;tropical forests;rain-forests;logged forests;life zones;venezuela;carbon
日期: 2009
Issue Date: 2012-12-14 09:59:01 (UTC+8)
關連: Biogeosciences, Volume 6, Issue 8, Page(s) 1615-1626.
摘要: The Amazon basin, one of the most substantial biomass carbon pools on earth, is characterised by strong macroecological gradients in biomass, mortality rates, and wood density from west to east. These gradients could affect necromass stocks, but this has not yet been tested. This study aims to assess the stocks and determinants of necromass across Amazonian forests. Field-based and literature data were used to find relationships between necromass and possible determinants. Furthermore, a simple model was applied to estimate and extrapolate necromass stocks across terra firma Amazonian forests. In eight northwestern and three northeastern Amazonian permanent plots, volumes of coarse woody debris (>= 10 cm diameter) were measured in the field and the density of each decay class was estimated. Forest structure and historical mortality data were used to determine the factors controlling necromass. Necromass is greater in forests with low stem mortality rates (northeast) rather than in forests with high stem mortality rates (northwest) (58.5 +/- 10.6 and 27.3 +/- 3.2 Mg ha(-1), respectively). Using all published necromass values, we find that necromass across terra firma forests in Amazonia is positively related to both forest dynamics (mortality mass inputs and a surrogate for decomposition rate (average wood density of living trees)) and forest structure (biomass), but is better explained by forest dynamics. We propose an improved method to estimate necromass for plots where necromass has not been measured. The estimates, together with other actual measurements of necromass, were scaled-up to project a total Amazonian necromass of 9.6 +/- 1.0 Pg C. The ratio of necromass (on average weighted by forest region) to coarse above-ground biomass is 0.127. Overall, we find (1) a strong spatial trend in necromass in parallel with other macroecological gradients and (2) that necromass is a substantial component of the carbon pool in the Amazon.
Relation: Biogeosciences
Appears in Collections:[依教師分類] 趙國容
[依資料類型分類] 期刊論文

Files in This Item:

There are no files associated with this item.






聯絡網站維護人員:wyhuang@nchu.edu.tw,04-22840290 # 412。

DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU/NCHU Library IR team Copyright ©   - Feedback