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FACE试验 (free airCO2 enrichment)开展的 10多年中 ,供试农作物主要有 :C3 禾本科作物小麦(TriticumaestivumL .)、多年生黑麦草 (Loliumperenne)和水稻 (OryzasativaL .) ,C4禾本科类高粱(Sorghumbicolor (L .)M ench) ,C3 豆科植物白三叶草 (Trifoliumrepens) ,C3 非禾本科块茎状作物马铃薯 (SolanumtuberosumL .) ,以及多年生C3 类木本作物棉花 (GossypiumhirsutumL .)和葡萄 (VitisviniferaL .) .本文系统整理和分析了以下各项参数的结果 :光合作用、气孔导度、冠层温度、水分利用、水势、叶面积指数、根茎生物量累积、作物产量、辐射利用率、比叶面积、N含量、N收益、碳水化合物含量、物候变化、土壤微生物、土壤呼吸、痕量气体交换以及土壤碳固定 .CO2 浓度升高对农作物的影响作用主要表现在以下方面 :(1)促进了植物光合作用、增加了其生物量累积 ;(2 )显著提高C3 作物产量 ,但对C4作物产量的影响很小 ;(3)降低了C3 和C4作物气孔导度 ,非常显著地提高了所有作物的水分利用率 ;(4)对植物生长的促进作用在水分不足与水分充足时二者相当或前者大于后者 ;(5 )对非豆科植物生长的促进作用要受到土壤低N水平限制 ,而对豆科植物则不受氮肥水平限制 ;(6 )对根系生长的促进作用要大于地上部分 ;(7)对多年
In the more than 10 years since the free air CO2 enrichment (FACE) trial, the main crops tested were: Triticum aestivum L., Lolium perenne and Oryzasativa L., Sorghumbicolor C4 L.) M ench, Trifolium repens, Solanum tuberosum L., and perennial C3 Gossypium hirsutum L. and Vitis vinifera L. The results of the following parameters were systematically analyzed and analyzed: photosynthesis, stomatal conductance, canopy temperature, water use, water potential, leaf area index, rhizome biomass accumulation, crop yield, radiation utilization, specific leaf area, N content , N benefits, carbohydrate content, phenological changes, soil microorganisms, soil respiration, trace gas exchange and soil carbon fixation.The effects of elevated CO2 on crops are mainly reflected in the following aspects: (1) to promote photosynthesis, Increased their biomass accumulation; (2) significantly increased the yield of C3 crops but had little effect on the yield of C4 crops ; (3) Reduce the stomatal conductance of C3 and C4 crops and significantly increase the water use efficiency of all crops; (4) The promotion of plant growth is equivalent to either inadequate or sufficient moisture or the former is greater than the latter ; (5) the promotion of non-leguminous plants is limited by the low N level of the soil, while the leguminous plants are not limited by the level of nitrogen fertilizer; (6) the promotion of root growth is greater than the aerial part; (7) For many years