No Differences in Soil Carbon Stocks Across the Tree Line in the Peruvian Andes
No Differences in Soil Carbon Stocks Across the Tree Line in the Peruvian Andes
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DOI：
10.1007/s10021-009-9300-2
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发表时间：
2009
期刊：
影响因子：
3.7
通讯作者：
M. Zimmermann;P. Meir;M. Silman;Anna C. Fedders;Adam Gibbon;Y. Malhi;D. Urrego;M. Bush;K. Feeley
中科院分区：
文献类型：
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作者：
M. Zimmermann;P. Meir;M. Silman;Anna C. Fedders;Adam Gibbon;Y. Malhi;D. Urrego;M. Bush;K. Feeley
可靠的土壤有机碳（SOC）储量测量对于预测全球变暖对全球土壤碳库的影响至关重要，但热带山地云雾林（TMCF）和邻近的高海拔草原（Puna）的土壤调查数据几乎不可用。TMCF是目前预测的全球变暖情景下最受威胁的生态系统之一。我们进行了密集的土壤采样活动，沿安第斯山脉2994和3860米asl之间的树线延伸沿着40公里，以量化SOC股票的TMCF，普纳草原和灌木林网站之间的过渡带的两个栖息地。从地表到基岩的土壤有机碳储量，TMCF为11.8（± 1.5，N = 24）kg C/m2，灌丛为14.7（± 1.4，N = 9）kg C/m2，草地为11.9（± 0.8，N = 35）kg C/m2，差异不显著（P> 0.05）。然而，土壤剖面分析显示出明显的差异，TMCF剖面显示出均匀的SOC分布与深度，灌木丛线性下降，和普纳网站的SOC密度与土壤深度呈指数下降。有机土层厚度在TMCF上限达到最大值（~70 cm），并随着海拔的增加而下降。在TMCF，没有显着增加SOC股票随着海拔高度的观察，可能是因为SOC股票在不同的网站，这反过来又与土壤深度的空间变异之间的差异很大。
Reliable soil organic carbon (SOC) stock measurements of all major ecosystems are essential for predicting the influence of global warming on global soil carbon pools, but hardly any detailed soil survey data are available for tropical montane cloud forests (TMCF) and adjacent high elevation grasslands above (puna). TMCF are among the most threatened of ecosystems under current predicted global warming scenarios. We conducted an intensive soil sampling campaign extending 40 km along the tree line in the Peruvian Andes between 2994 and 3860 m asl to quantify SOC stocks of TMCF, puna grassland, and shrubland sites in the transition zone between the two habitats. SOC stocks from the soil surface down to the bedrock averaged (±standard error SE) 11.8 (±1.5,N= 24) kg C/m2in TMCF, 14.7 (±1.4,N= 9) kg C/m2in the shrublands and 11.9 (±0.8,N= 35) kg C/m2in the grasslands and were not significantly different (P> 0.05 for all comparisons). However, soil profile analysis revealed distinct differences, with TMCF profiles showing a uniform SOC distribution with depth, shrublands a linear decrease, and puna sites an exponential decrease in SOC densities with soil depth. Organic soil layer thickness reached a maximum (~70 cm) at the upper limit of the TMCF and declined with increasing altitude toward puna sites. Within TMCF, no significant increase in SOC stocks with increasing altitude was observed, probably because of the large variations among SOC stocks at different sites, which in turn were correlated with spatial variation in soil depth.