环境CO2浓度升高对植物的影响研究

本文阐述了环境CO2浓度升高对植物的影响。环境CO2浓度升高对植物光合生产有促进作用，其中对C3植物光合生产的促进作用最大。环境中短期CO2浓度升高时，植物光合生产率增加；长期CO2浓度升高条件下，植物光合速率下降并发生光合适应现象。这可能是植物在长期高浓度CO2环境中，光合生产的库源关系不平衡引起的反馈抑制作用和营养吸收不能满足光合速率增加的需求所引起Rubisco活性和含量下降的原故。另外，在环境CO2浓度升高的条件下，植物的呼吸强度也会发生变化；根的分枝数增多，根系的分泌量和吸收能力增加；植物的总生物量增加，对臭氧伤害的抗性增强。同时，温度、土壤N素和P素含量对植物在CO2浓度升高的反应产生影响，适量的N和P素供应能协同CO2升高时植物生长的促进作用．

Study on Effect of Increasing CO2 Concentration of Environment on Plant Growth

This paper described the effect of CO2 concentration increased on environmental of plant.Elevated atmospheric CO2 coneneration can stimulate the growth piants;especially C3 plants.Plant protosynthesis could be stimulated under the short-term CO2 enrichment,but decreased and accompanied by the photosynthetic acclimation whenexposed to long-term devated CO2 concentration.This may by due to:(1T)he feedback inhibition induced by the imbalance of source-sink relationship;(2T)he decrease of Rubisco contant and activity caused by short of nutrient.Under the elevated CO2 concentration,branches and number of roots,release of exudates.Absorption of nutrient elements by roots,my corrhiza infection rate and biomass of plants were incread.The ability resitant to O3 injury of plant was inereased.The atmospheric temperature,nitrogen and phosphorus supply from soil could affect responses of plants to the elevated CO2 concentration.