LaDeau S L, Clark J S
Department of Biology and University Program in Ecology, Duke University, Durham, NC 27708, USA.
Science. 2001 Apr 6;292(5514):95-8. doi: 10.1126/science.1057547.
We determined the reproductive response of 19-year-old loblolly pine (Pinus taeda) to 4 years of carbon dioxide (CO2) enrichment (ambient concentration plus 200 microliters per liter) in an intact forest. After 3 years of CO2 fumigation, trees were twice as likely to be reproductively mature and produced three times as many cones and seeds as trees at ambient CO2 concentration. A disproportionate carbon allocation to reproduction under CO2 enrichment results in trees reaching maturity sooner and at a smaller size. This reproductive response to future increases in atmospheric CO2 concentration is expected to change loblolly dispersal and recruitment patterns.
我们在一片完整的森林中，测定了19年生火炬松（Pinus taeda）对4年二氧化碳（CO₂）浓度升高（环境浓度加200微升/升）的生殖响应。经过3年的CO₂熏蒸处理，与处于环境CO₂浓度下的树木相比，接受处理的树木达到生殖成熟的可能性是其两倍，产生的球果和种子数量是其三倍。在CO₂浓度升高的情况下，碳分配不成比例地偏向于生殖，导致树木更早且以更小的尺寸达到成熟。预计这种对未来大气CO₂浓度升高的生殖响应将改变火炬松的扩散和更新模式。
