文献类型：期刊文献

英文题名：Interaction of CO2 concentrations and water stress in semiarid plants causes diverging response in instantaneous water use efficiency and carbon isotope composition

作者：Zhao, Na[1,3] Meng, Ping[2] He, Yabing[1] Yu, Xinxiao[1,3]

第一作者：Zhao, Na

通信作者：Yu, XX[1];Yu, XX[2]

机构：[1]Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Beijing Collaborat Innovat Ctr Ecoenvironm Improv, Beijing, Peoples R China

年份：2017

卷号：14

期号：14

起止页码：3431-3444

外文期刊名：BIOGEOSCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000405952500001)】；

基金：Financial support for this project was provided by the National Natural Science Foundation of China (grant no. 41430747) and the Beijing Municipal Education Commission (CEFF-PXM2017_014207_000043). We thank Beibei Zhou and Yuanhai Lou for collection of materials and management of saplings. We are grateful to the anonymous reviewers for constructive suggestions regarding this paper.

语种：英文

摘要：In the context of global warming attributable to the increasing levels of CO2, severe drought may be more frequent in areas that already experience chronic water shortages (semiarid areas). This necessitates research on the interactions between increased levels of CO2 and drought and their effect on plant photosynthesis. It is commonly reported that C-13 fractionation occurs as CO2 gas diffuses from the atmosphere to the substomatal cavity. Few researchers have investigated C-13 fractionation at the site of carboxylation to cytoplasm before sugars are exported outward from the leaf. This process typically progresses in response to variations in environmental conditions (i.e., CO2 concentrations and water stress), including in their interaction. Therefore, saplings of two typical plant species (Platycladus orientalis and Quercus variabilis) from semiarid areas of northern China were selected and cultivated in growth chambers with orthogonal treatments (four CO2 concentration ([CO2]) x five soil volumetric water content (SWC)). The delta C-13 of water-soluble compounds extracted from leaves of saplings was determined for an assessment of instantaneous water use efficiency (WUEcp) after cultivation. Instantaneous water use efficiency derived from gas-exchange measurements (WUEge ) was integrated to estimate differences in delta C-13 signal variation before leaf-level translocation of primary assimilates. The WUEge values in P. orientalis and Q. variabilis both decreased with increased soil moisture at 35-80% of field capacity (FC) and increased with elevated [CO2] by increasing photosynthetic capacity and reducing transpiration. Instantaneous water use efficiency (iWUE) according to environmental changes differed between the two species. The WUEge in P. orientalis was significantly greater than that in Q. variabilis, while an opposite tendency was observed when comparing WUEcp between the two species. Total C-13 fractionation at the site of carboxylation to cytoplasm before sugar export (total C-13 fractionation) was species-specific, as demonstrated in the interaction of [CO2] and SWC. Rising [CO2] coupled with moistened soil generated increasing disparities in delta C-13 between water-soluble compounds (delta C-13(WSC)) and estimates based on gas-exchange observations (delta C-13(obs)) in P. orientalis, ranging between 0.0328 and 0.0472 %. Differences between delta C-13(WSC) and delta C-13(obs) in Q. variabilis increased as [CO2] and SWC increased (0.0384-0.0466 %). The C-13 fractionation from mesophyll conductance (g(m)) and post-carboxylation both contributed to the total C-13 fractionation that was determined by delta C-13 of water-soluble compounds and gas-exchange measurements. Total C-13 fractionation was linearly dependent on stomatal conductance, indicating that post-carboxylation fractionation could be attributed to environmental variation. The magnitude and environmental dependence of apparent post-carboxylation fractionation is worth our attention when addressing photosynthetic fractionation.