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CO 2浓度变化(350μmol/mol和700μmol/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CO 2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CO 2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)CO 2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,CO 2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CO 2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CO 2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CO 2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,CO 2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。
Atmospheric CO 2 concentrations are predicted to happen from approximately 350μmol/mol,today to over 700μmol/mol in the late 21th century.A pot experiment was conducted to study the interaction of elevated CO 2 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 CO 2 concentrations(350 and 700μmol/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 CO 2 and precipitation had the significant effects on photosynthetic parameters,below-ground biomass and root:shoot ratio;at 350μmol/mol CO 2 concentrations,above-ground biomass,below-ground biomass and C/N significantly increased,and root:shoot ratio significantly decreased;(2)the elevated CO 2 increased the carbon and decreased N of different organs,while precipitation regimes promoted or inhibited these results;(3)the elevated CO 2 increased photosynthetic rate(Pn),stomatal conductance(Gs)and intercellular CO 2 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 CO 2 levels,furthermore,CO 2 may partly compensate for the negative effect of low precipitation on the growth and development of wheat.
作者
王佳
冯晓淼
芈书贞
容海亮
WANG Jia;FENG Xiaomiao;MI Shuzhen;RONG Hailiang(College of Resources and Environmental Sciences,Shijiazhuang University,Shijiazhuang 050035,China;Henan Agricultural University,Zhengzhou 450000,China;Shijiazhuang University of Applied Technology,Department of Electronic and Electrical Engineering,Shijiazhuang 050081,China)
出处
《水土保持研究》
CSCD
北大核心
2020年第1期328-334,339,共8页
Research of Soil and Water Conservation
基金
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)
关键词
降雨变化
CO
2
光合特性
碳氮
冬小麦
precipitation regimes
CO 2
photosynthetic characteristics
C
N
wheat
