|Table of Contents|

Water-carbon Coupling of Plant Leaf and Whole-plant and Their Relationship(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第04期
Page:
991-1001
Research Field:
环境与可持续发展专刊
Publishing date:

Info

Title:
Water-carbon Coupling of Plant Leaf and Whole-plant and Their Relationship
Author(s):
GUO Xin1;  ZHANG Yong-e2;  WEI Xiao-yan3;  LI Yong-fu2;  WEI Tian-xing1*;  ZHANG Xiao-ming2
(1. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2. China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 3. Ningxia Soil and Water Conservation Monitoring Station, Yinchuan 750002, Ningxia, China)
Keywords:
water use efficiency;  plant leaf;  whole-plant;  CO2 concentration;  soil water content;  Platycladus Orientalis;  photosynthetic physiology
PACS:
Q948.1
DOI:
-
Abstract:
The study on water-carbon coupling of plant leaf and whole-plant and their relationship can provide theoretical support for integrating water-carbon coupling among multiple scales, and deepen the understanding of plant physiological regulation of adaptation. Platycladus Orientalis saplings in the western mountains of Beijing were cultured in an artificial climate chamber with three atmospheric CO2 concentrations(Ca)and five soil water content(SWC)gradients for interactive treatment. The carbon sequestration and water consumption rate, and the photosynthetic physiological characteristics of plant leaves and whole-plants were measured by exchange method, mini-lysimeters and static assimilation chamber; and then, the water and carbon processes of plant leaf and whole-plant and their coupling mechanism were analyzed with water use efficiency, and the relationship between water-carbon coupling of plant leaf and whole-plant was explored. The results show that ① with the exception of excessive-watered, the transpiration rate and net photosynthetic rate of plant leaf and whole-plant increase with SWC; the transpiration rate is generally maximum at Ca of 400 μmol?mol-1, and the net photosynthetic rate is generally maximum at Ca of 800 μmol?mol-1; ② the instantaneous water use efficiencies of plant leaf(WUEleaf)and whole-plant(WUEtree)decrease with the increase of SWC except for severe drought condition; under the same SWC condition, the WUEleaf and WUEtree reach maximum at Ca of 800 μmol?mol-1; the WUEleaf shows a highly significant positive correlation with WUEtree. In summary, high Ca can offset the photosynthetic physiological impairment of plant leaf and whole-plant caused by restricted soilwater availability, and improve the water use efficiency of Platycladus Orientalis saplings. Within species, WUEleaf is a suitable predictor for WUEtree at the same time scale when canopy characteristics are similar.

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Last Update: 2023-06-20