The individual scale water-carbon coupling process of Platycladus orientalis under CO2 and water stress in Beijing mountainous area

doi:10.12302/j.issn.1000-2006.202303031

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (1): 128-136.doi: 10.12302/j.issn.1000-2006.202303031

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The individual scale water-carbon coupling process of Platycladus orientalis under CO₂ and water stress in Beijing mountainous area

ZHANG Longqi¹(), ZHANG Yong’e², JIA Guodong¹^,^*(), LYU Xiangrong¹, ZHANG Xiao¹, LEI Ziran¹, LIU Rui¹

1. Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation, the Metropolitan Area Forest Ecosystem Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2. Institute of Sediment Research, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Received:2023-03-11 Revised:2024-01-20 Online:2025-01-30 Published:2025-01-21
Contact: JIA Guodong E-mail:zlq1255676314@163.com;jgd3@163.com

Abstract

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 800 μmol/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.

Key words: water-carbon coupling, vegetation, water use efficiency, carbon dioxide, water stress, Platycladus orientalis

CLC Number:

S715

ZHANG Longqi, ZHANG Yong’e, JIA Guodong, LYU Xiangrong, ZHANG Xiao, LEI Ziran, LIU Rui. The individual scale water-carbon coupling process of Platycladus orientalis under CO₂ and water stress in Beijing mountainous area[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2025, 49(1): 128-136.

Figures/Tables 6

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组别 group	占田间持水率的百分比 percentage of field holding capacity	土壤水分状况 soil moisture regime
A	35%~45%	重度干旱 severe drought
B	50%~60%	中度干旱 moderate drought
C	≥60%~70%	轻度干旱 mild drought
D	≥70%~80%	自然适宜 natural suitability
E	95%~100%	水量充沛 plenty of water

The individual scale water-carbon coupling process of Platycladus orientalis under CO₂ and water stress in Beijing mountainous area

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