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upzl铁杆木虫 (著名写手)
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贫瘠的森林，高效的生产！ 已有1人参与
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题目就很有意思，和我们平时想象的很不一样。 Fertile forests produce biomass more efficiently S. Vicca1,*, S. Luyssaert2, J. Peñuelas3, M. Campioli1, F. S. Chapin III4, P. Ciais2, A. Heinemeyer5, P. Högberg6, W. L. Kutsch7, B. E. Law8, Y. Malhi9, D. Papale10, S. L. Piao11, M. Reichstein12, E. D. Schulze12, I. A. Janssens1 Ecology Letters (2012) Article first published online: 4 APR 2012 DOI: 10.1111/j.1461-0248.2012.01775.x Abstract Trees with sufficient nutrition are known to allocate carbon preferentially to aboveground plant parts. Our global study of 49 forests revealed an even more fundamental carbon allocation response to nutrient availability: forests with high-nutrient availability use 58 ± 3% (mean ± SE; 17 forests) of their photosynthates for plant biomass production (BP), while forests with low-nutrient availability only convert 42 ± 2% (mean ± SE; 19 forests) of annual photosynthates to biomass. This nutrient effect largely overshadows previously observed differences in carbon allocation patterns among climate zones, forest types and age classes. If forests with low-nutrient availability use 16 ± 4% less of their photosynthates for plant growth, what are these used for? Current knowledge suggests that lower BP per unit photosynthesis in forests with low- versus forests with high-nutrient availability reflects not merely an increase in plant respiration, but likely results from reduced carbon allocation to unaccounted components of net primary production, particularly root symbionts. |
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