WANG Jia,FENG Xiaomiao,MI Shuzhen,et al.Influence of Elevated CO2 and Precipitation Regimes on the Characteristics of Photosynthesis and C, N of Wheat[J].Research of Soil and Water Conservation,2020,27(01):328-334,339.
模拟降雨量变化与CO2浓度升高对小麦光合特性和碳氮特征的影响
- Title:
- Influence of Elevated CO2 and Precipitation Regimes on the Characteristics of Photosynthesis and C, N of Wheat
- 文章编号:
- 1005-3409(2020)01-0328-07
- Keywords:
- precipitation regimes; CO2; photosynthetic characteristics; C; N; wheat
- 分类号:
- S158.3
- 文献标志码:
- A
- 摘要:
- 以小麦为试材,连续3年采用盆栽试验和开顶式控制气室模拟CO2浓度变化(350 μmol/mol和700 μmol/mol)研究了小麦光合特性与碳氮特征对降水变化减少30%、减少15%、自然降水、增加15%和增加30%(-30%、-15%,0,15%,30%)的响应。结果表明:(1)降雨量变化和CO2浓度的交互作用显著影响小麦的净光合速率,地上生物量、地下生物量、根冠比和不同器官碳氮含量。在相同CO2浓度时,随着降雨量的增加,小麦地上生物量、地下生物量和C/N显著增加,而根冠比相应地降低。(2)CO2浓度上升明显地促进了小麦根、茎、叶中的碳含量,显著性地抑制了小麦根、茎、叶中氮含量,降雨量增加或减少也显著性地促进或抑制了这一作用。(3)在降雨量相同条件下,CO2浓度倍增显著性地促进了小麦叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr),降雨量增加促进了小麦叶片净光合速率(Pn)和胞间CO2浓度(Ci),而抑制了小麦叶片气孔导度(Gs)和蒸腾速率(Tr)。(4)在未来CO2浓度升高的背景下,高降雨量对生物量的积累并无显著促进作用,CO2浓度升高可以补偿低水分条件对小麦生长发育所造成的不利影响。
- Abstract:
- Atmospheric CO2 concentrations are predicted to happen from approximately 350 μmol/mol, today to over 700 μmol/mol in the late 21th century. A pot experiment was conducted to study the interaction of elevated CO2 concentration and precipitation changing with the characteristics of photosynthetic characteristics, biomass allocation, and carbon and nitrogen content characteristics in roots, stem, and leaf of wheat. The main plots included two CO2 concentrations(350 and 700 μmol/mol)and five conditions of the precipitation patterns(natural precipitation control 0, 30%, -30%, and 15% of the precipitation(-15%, 15%], and 30%. The results showed that:(1)the interaction between increased CO2 and precipitation had the significant effects on photosynthetic parameters, below-ground biomass and root: shoot ratio; at 350 μmol/mol CO2 concentrations, above-ground biomass, below-ground biomass and C/N significantly increased, and root: shoot ratio significantly decreased;(2)the elevated CO2 increased the carbon and decreased N of different organs, while precipitation regimes promoted or inhibited these results;(3)the elevated CO2 increased photosynthetic rate(Pn), stomatal conductance(Gs)and intercellular CO2 concentration(Ci), while precipitation regimes promoted Pn and Ci, and inhibited Gs and transpiration rate;(4)these results suggest that higher precipitation will not increase the biomass of wheat at the future ambient CO2 levels, furthermore, CO2 may partly compensate for the negative effect of low precipitation on the growth and development of wheat.
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备注/Memo
收稿日期:2018-01-09 修回日期:2018-03-02
资助项目:石家庄市科学技术研究与发展计划项目“山地型旅游区生态健康研究与示范”(181790048A)
第一作者:王佳(1981—),女,河北省石家庄人,讲师,硕士,研究方向:环境与生态方向。E-mail:wangjia5745@sina.com
通信作者:芈书贞(1980—),女,河南南阳人,副教授,博士,研究方向:全球气候生态学。E-mail:Mishuzhen_HN@163.com