Chin J Plan Ecolo ›› 2016, Vol. 40 ›› Issue (9): 912-924.doi: 10.17521/cjpe.2015.0431


• Research Articles • Previous Articles     Next Articles

Leaf water δD and δ18O enrichment process and influencing factors in spring maize (Zea mays) grown in the middle reaches of Heihe River Basin

Xiao-Ting WANG1,2, Xue-Fa WEN1,*()   

  1. 1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-12-02 Accepted:2016-05-12 Online:2016-09-29 Published:2016-09-10
  • Contact: Xue-Fa WEN


Aims The stable isotope fractionation of plant water is an important part for the water cycle in the soil-plant-atmosphere continuum. There is a lack of control mechanisms research of leaf water isotope ratio (δl,b) enrichment based on the field conditions. Because it is tough to get the measured 18O isotope ratio (δ18O l,b) and deuterium (D) isotope ratio (δDl,b) of leaf water (collective name δl,b). Therefore most previous research focuses on model building used the limited number of δl,b. Leaf water δDl,b and δ18O l,b enrichment (collective name Δl,b) is usually represented as the difference of the leaf water isotope ratio (δl,b) and the plant source water isotope ratio (δDx and δ18O x,collective name δx), that is Δl,b = δl,b - δx.
Methods A field experiment with spring maize (Zea mays) was conducted in the middle reaches of Heihe River Basin to investigate the characteristics of leaf water δ18O and δD enrichment and their abiotic control mechanisms on seasonal and daily scales. Leaf and stem samples were collected and analyzed according to different time scales, and the δ18O and δD of atmospheric water vapor (collective name δv) were determined based on the in situ and continuous water vapor isotope ratio measurement system at the same time.
Important findings The results showed that: δl,b and Δl,b of leaf water varied little during the experimental season while largely at daily scale, which enrichment was found at the daytime but depletion at night. Atmospheric water vapor isotope ratio (δv) and relative humidity were main factors to D on both seasonal and daily scales; for 18O, only relative humidity was the key control factor on both seasonal and daily scales. Differences of D and 18O came from the equilibrium fractionation because equilibrium fractionation factor for D was over 8 times than for 18O. The analysis of these differences help us distinguish the environmental factors of leaf water enrichment for D (ΔDl,b) from leaf water enrichment for 18O (Δ18Ol,b), and improve our understanding of leaf water enrichment process and develop the related models as well.

Key words: leaf water enrichment, δD and δ18O, atmospheric water vapor, relative humidity, temperature, synergism

Fig. 1

Seasonal variations of δD (A) and δ18O (B) of bulk leaf water isotope ratio (δl,b), xylem water isotope ratio (δx) and atmospheric water vapor isotope ratio (δv) at an arid artificial oasis maize field in the Heihe River Basin. Every value was observed in the period of 13:00-15:00. Error bars were the standard deviation of the upper and lower canopy."

Fig. 2

Daily variations of δD (A, C, E) and δ18O (B, D, F) of bulk leaf water isotope ratio (δl,b), xylem water isotope ratio (δx) and atmospheric water vapor isotope ratio (δv) at an arid artificial oasis maize field in the Heihe River Basin. Shadow areas indicated the nighttime (19:30-6:30)."

Fig. 3

Seasonal (A) and diurnal (B) regression relationship between D isotope ratio (δD) and 18O isotope ratio (δ18O) of bulk leaf water, xylem water and atmospheric water vapor at an arid artificial oasis maize field in the Heihe River Basin. The local meteoric water lines (LMWL) were plotted in each panel for references."

Fig. 4

Seasonal (A, C) and diurnal (B, D) relationships between bulk leaf water enrichment above source water (ΔD and Δ18O) and atmospheric water vapor enrichment above source water (ΔDv and Δ18Ov) above an arid artificial oasis maize field in the Heihe River Basin."

Fig. 5

Seasonal (A, C) and diurnal (B, D) relationships between bulk leaf water enrichment above source water (ΔD and Δ18O) and relative humidity referenced to canopy temperature (RH) above an arid artificial oasis maize field in the Heihe River Basin."

Fig. 6

Seasonal (A, C) and diurnal (B, D) relationships between bulk leaf water enrichment above source water (ΔD and Δ18O) and canopy temperature (T) above an arid artificial oasis maize field in the Heihe River Basin."

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