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- Title
基于多种同位素模型的侧柏林生态系统蒸散组分定量拆分.
- Authors
武昱鑫; 张永娥; 贾国栋; 王渝凇; 余新晓
- Abstract
To fully understand the changes in the evapotranspiration components in forest ecosystem and their contribution to evapotranspiration at daily scale, we used the hypothesis theory of isotopic steady state and non-steady state combined with the water isotope analyzer system to quantitatively split and compare the evapotranspiration components of Platycladus orientalis ecosystem during the growing season. Results showed that the 18O of water from different sources during the four measurement days (August 5, 8, 10, 11, 2016) all showed surface soil water and oxygen isotope composition (δS) > branch water and oxygen isotope composition (δX) > atmospheric water vapor oxygen isotopes composition (δV ), with obvious differences due to the isotope fractionation. Oxygen isotopes composition of soil evaporated water vapor (δE) was between -26.89‰~ -59.68‰ at the daily scale, showing a pattern of first rising and then decreasing. The oxygen isotopic composition of evapotranspiration water vapor in forest ecosystem (δET ) was between -15.99‰~ -10.04‰. The oxygen isotopic composition of transpired water vapor under steady state - (δT-ISS ) was between 12.10‰~-9.51‰. The oxygen isotopic composition of transpired water vapor under non-steady state (δT-NSS) was between - 13. 02‰ ~ -7.23‰. δET and δT-NSS had the same changing trend throughout the day at the daily scale, while the trend of δET, δT-ISS and δT-NSS was approximately the same during 11:00-17:00. In general, the contribution rate of plant transpiration to total evapotranspiration showed that FT-ISS was between 79.1%-98.7%, and FT-NSS was between 88.7%-93.7%. Our results suggested that water consumption through soil evaporation was far less than that of vegetation transpiration in the study area, and that vegetation transpiration dominated forest evapotranspiration.
- Subjects
ATMOSPHERIC water vapor; PLANT transpiration; OXYGEN isotopes; OXYGEN in water; WATER vapor; SOIL moisture
- Publication
Yingyong Shengtai Xuebao, 2021, Vol 32, Issue 6, p1971
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202106.023