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- Title
不同动力学分馏系数对北京山区侧柏 叶片水 δ<sup>18</sup>O的模拟.
- Authors
史佳美; 余新晓; 贾国栋; 张秋芬; 王丹丹; 王亚鹏
- Abstract
Clarifying 18O isotope composition of leaf water (δL,b) would provide theoretical reference for the study of leaf physiology and forest hydrology. We continuously monitored the concentration of atmospheric water vapor (Wa) and 18O isotope composition of atmospheric water vapor (δv) at the canopy of Platycladus laterals plantation in the mountain area of Beijing. We analyzed the effects of kinetic fractionation coefficients £kl (32%) and ek2 (28%) on the prediction of δL,b by combining the measured leaf water 18O isotope (δx) and δL,b of P. lateralis. The results showed that the diurnal variation of Wa was irregular. Atmospheric relative humidity (RH) showed a "V" shape of diurnal variation, and stomatal conductance (gs) increased first and then decreased at the diurnal scale. Wa, RH, and gs showed a significant negative correlation with δL,b when isotopes approached a steady-state equilibrium around noon. The kinetic fractionation coefficient £kl and £k2 were applied to the Craig-Gordon model to predict δL,b under the isotopic quasi-steady-state condition. The results showed that the predicted values of £k2 approached the observed values of δL, b. This result indicated that the application of £k2 to the model was more consistent with the change of water isotope concentration in the leaves of P. lateralis in the mountain area of Beijing. These results would improve our understanding of water isotope enrichment model and evapotranspiration resolution model in leaves.
- Subjects
BEIJING (China); ATMOSPHERIC water vapor; HUMIDITY; ISOTOPE separation; COMPOSITION of leaves; WATER vapor; ATMOSPHERIC composition
- Publication
Yingyong Shengtai Xuebao, 2020, Vol 31, Issue 6, p1827
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202006.021