南京林业大学学报（自然科学版）2025，Vol.49Issue(1)：128-136,9.DOI:10.12302/j.issn.1000-2006.202303031
CO2和水分胁迫下北京山区侧柏个体尺度水碳耦合过程研究
The individual scale water-carbon coupling process of Platycladus orientalis under CO2 and water stress in Beijing mountainous area
摘要
Abstract
[Objective]In arid and semiarid regions,efficient water use for vegetation construction and restoration to maximize functional diversity has become a key research focus due to scarce precipitation.The study of plant water-carbon coupling processes is crucial in this context.[Method]This research focused on Platycladus orientalis,the main afforestation species in Beijing mountainous areas.An indoor pot simulation experiment was conducted over six months to measure the individual transpiration water consumption,carbon sequestration,and respiration rate of P.orientalis under different CO2 concentrations and soil moisture levels.Water use efficiency was used as the water-carbon coupling index to analyze these processes and their influencing factors.[Result](1)The transpiration rate of P.orientalis was significantly affected by soil water content,peaking at 70％-80％field water capacity and then slightly decreased.(2)Both soil water content and CO2 concentration significantly influenced individual carbon processes and water-carbon coupling.(3)Instantaneous and short-term water use efficiency reached maximum at CO2 concentrations of 600 and 800μmol/mol with 50％-60％field water capacity.(4)There was a significant linear correlation between cumulative carbon sequestration and water consumption(P＜0.05),with a maximum ratio of 24.35 mmol/mol at a CO2 concentration of 800 μmol/mol and 50％-60％field water capacity.[Conclusion]The increase of carbon dioxide concentration was conducive to alleviating the individual scale drought stress,and soil water content significantly affected the water-carbon process of P.orientalis.关键词
水碳耦合/植被/水分利用效率/二氧化碳/水分胁迫/侧柏Key words
water-carbon coupling/vegetation/water use efficiency/carbon dioxide/water stress/Platycladus orientalis分类
农业科技引用本文复制引用
张龙齐,张永娥,贾国栋,吕相融,张潇,雷自然,刘锐..CO2和水分胁迫下北京山区侧柏个体尺度水碳耦合过程研究[J].南京林业大学学报（自然科学版）,2025,49(1):128-136,9.基金项目
国家自然科学基金面上项目(42277062) （42277062）
国家自然科学基金项目(U2243202,42230714). （U2243202,42230714）
