Caspersen J P, Pacala S W, Jenkins J C, Hurtt G C, Moorcroft P R, Birdsey R A
Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08540, USA.
Science. 2000 Nov 10;290(5494):1148-51. doi: 10.1126/science.290.5494.1148.
Carbon accumulation in forests has been attributed to historical changes in land use and the enhancement of tree growth by CO2 fertilization, N deposition, and climate change. The relative contribution of land use and growth enhancement is estimated by using inventory data from five states spanning a latitudinal gradient in the eastern United States. Land use is the dominant factor governing the rate of carbon accumulation in these states, with growth enhancement contributing far less than previously reported. The estimated fraction of aboveground net ecosystem production due to growth enhancement is 2.0 +/- 4.4%, with the remainder due to land use.
森林中的碳积累归因于土地利用的历史变化以及二氧化碳施肥、氮沉降和气候变化对树木生长的促进作用。利用美国东部跨越纬度梯度的五个州的清查数据，估算了土地利用和生长促进的相对贡献。土地利用是控制这些州碳积累速率的主导因素，生长促进的贡献远低于先前报道的水平。因生长促进导致的地上净生态系统生产的估计比例为2.0±4.4%，其余归因于土地利用。
