Calfapietra C, Gielen B, Galema A N J, Lukac M, De Angelis P, Moscatelli M C, Ceulemans R, Scarascia-Mugnozza G
Università degli Studi della Tuscia, Department of Forest Environment and Resources (DISAFRI), Via S. Camillo de Lellis, I-01100 Viterbo, Italy.
Tree Physiol. 2003 Aug;23(12):805-14. doi: 10.1093/treephys/23.12.805.
This paper investigates the possible contribution of Short Rotation Cultures (SRC) to carbon sequestration in both current and elevated atmospheric CO2 concentrations ([CO2]). A dense poplar plantation (1 x 1 m) was exposed to a [CO2] of 550 ppm in Central Italy using the free-air CO2 enrichment (FACE) technique. Three species of Populus were examined, namely P. alba L., P. nigra L. and P. x euramericana Dode (Guinier). Aboveground woody biomass of trees exposed to elevated [CO2] for three growing seasons increased by 15 to 27%, depending on species. As a result, light-use efficiency increased. Aboveground biomass allocation was unaffected, and belowground biomass also increased under elevated [CO2] conditions, by 22 to 38%. Populus nigra, with total biomass equal to 62.02 and 72.03 Mg ha-1 in ambient and elevated [CO2], respectively, was the most productive species, although its productivity was stimulated least by atmospheric CO2 enrichment. There was greater depletion of inorganic nitrogen from the soil after three growing seasons in elevated [CO2], but no effect of [CO2] on stem wood density, which differed significantly only among species.
本文研究了短轮伐期栽培（SRC）在当前和大气二氧化碳浓度（[CO2]）升高情况下对碳固存的潜在贡献。在意大利中部，利用自由空气二氧化碳富集（FACE）技术，将一片密集的杨树人工林（株行距1×1米）暴露于550 ppm的[CO2]环境中。研究了三种杨树，即银白杨（Populus alba L.）、黑杨（Populus nigra L.）和欧美杨（Populus x euramericana Dode (Guinier)）。在三个生长季节中，暴露于高[CO2]环境下的树木地上木质生物量增加了15%至27%，增幅因树种而异。因此，光能利用效率有所提高。地上生物量分配未受影响，在高[CO2]条件下地下生物量也有所增加，增幅为22%至38%。黑杨在环境[CO2]和高[CO2]条件下的总生物量分别为62.02和72.03 Mg ha-1，是生产力最高的树种，不过其生产力受大气二氧化碳富集的刺激最小。在高[CO2]环境下经过三个生长季节后，土壤中的无机氮消耗更大，但[CO2]对茎干木材密度没有影响，茎干木材密度仅在树种之间存在显著差异。
