摘 要 ：2001—2003年，利用农田开放式空气CO2浓度增高 (FACE) 技术平台，以冬小麦宁麦9号为供试材料，研究开放式条件下CO2浓度增高对小麦整个生育期干物质生产与分配的影响.结果表明：与对照相比，FACE处理使小麦播种-越冬始期的干物质生产量略有增加（10.8%)，使越冬始期-拔节期、拔节期-孕穗期、孕穗期-抽穗期显著增加，分别增加了31.6%、40.5%、27.2%，使抽穗期-成熟期略有减少(-5.5%)，使成熟期生物产量显著增加(13.6%)；FACE处理对小麦播种-越冬始期的平均叶面积系数(LAI)和净同化率(NAR)均无显著影响，但使越冬始期-抽穗期LAI显著增加，NAR稍有增加，使抽穗期-抽穗后20 d NAR显著下降；FACE处理使不同生育时期叶片占全株质量的比例下降，而使茎鞘占全株质量的比例增加；FACE小麦抽穗期和成熟期茎鞘可溶性糖和淀粉含量及总量均明显增加.
Abstract:A free-air CO2 enrichment (FACE) experiment was conducted in 2001—2003 to study the effects of predicted higher CO2 levels on the dry matter (DM) production and allocation in win- ter wheat variety Ningmai 9. The results showed that under FACE, the DM production had an in- crease of 10.8%, 31.6%, 40.5% and27.2% during the growth periods from sowing to wintering (Period 1), wintering to jointing (Period 2), jointing to booting (Period 3), and booting to heading (Period 4), respectively, but a decrease of 5.5% in the period from heading to grain maturity (Period 5). As a result, the final total biomass at maturity was increased by 13.6%. FACE had no significant effect on leaf area index (LAI) and net assimilation rate (NAR) in Period 1, but made the LAI in Period 2 increased obviously, and the NAR decreased dramatically in Period 3. Under FACE, the proportion of leaf to total aboveground DM decreased, while that of stem (including sheath) to total above-ground DM showed an opposite trend in the whole growth period. The percentage and total amount of soluble sugar and starch in the stem at grain-filling stage were also increased obviously under FACE.