Stomatal and environmental control on evapotranspiration in a plantation in the lower mountain areas of North China

Huang, Hui; Ping, 孟平 Meng; Jinsong, 张劲松 Zhang; Ning, 郑宁 Zheng; Changrong, 贾长荣 Jia

doi:10.5846/stxb201306091509

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ω was similar to that in some other broadleaved forests (Wilson & Baldocchi, 2000) but larger than that in some coniferous forests (Humphreys et al, 2003). Many studies have showed that Ω and g s in dry period are significantly lower than that in abundant water period (Huang et al, 2014). Year 2019 was a typical dry year (Figure 3c–e); Ω and g s in 2019 were significantly lower than those in 2017 and 2018 (Figures 3g and 6a).…”

Section: Discussionmentioning

confidence: 99%

Environmental and stomatal control on evapotranspiration in a natural oak forest

Niu

Liu

2022

Ecohydrology

View full text Add to dashboard Cite

Evapotranspiration (ET) is an important component in water budgets in forest ecosystems, and the associated latent heat flux has important implications for regional climate. However, biophysical control mechanisms on variations in ecosystem ET on intra‐annual scales may have year‐to‐year variations in different years with contrasting precipitation and soil water contents. Related research is lacking in natural oak forests in Central China. Based on eddy‐covariance technique, we investigated variations of ET and controlling factors in a natural oak forest in central China over three years (2017–2019) with contrasting soil water contents (SWCs) and precipitation. The ET of the oak forest was mainly affected by surface conductance (gs) in growing seasons, and the restriction from stoma on ET was aggravated in dry year. High vapour pressure deficit (VPD) promoted gs and ET in wet year but decreased gs and ET in dry year. There was a positive relationship between shallow soil water contents and gs in dry year but no relationship between the two variables in wet year. The ET were 738.1, 750.6 and 513.1 mm, respectively, for 2017–2019, with a coefficient of variation (CV) of 20%, while the corresponding precipitation (P) were 1239.4, 855.8 and 645.6 mm, with a CV of 33%. Annual ET was the lowest in the year with the lowest P, SWC and gs. Short‐term droughts (periods with relative extractable water content less than 0.1 for less than 15 days) only constrained gs and ET in short timescales (e.g., hours). Long‐term droughts (periods with relative extractable water content less than 0.1 for more than 15 days) evidently decreased the gs, thus reducing the ET and affecting energy partitioning in the corresponding period. ET/P were 0.6, 0.88 and 0.79 in 2017–2019, respectively, indicating that ET consumed most of the rain. The ratios of latent heat flux (LE) to net radiation (Rn) were 0.86, 0.88 and 0.6 during growing seasons in 2017–2019, respectively. Our study suggested that the natural oak forest has high ET rate and soil moisture affects the variations of ET.

show abstract

Section: Discussionmentioning

confidence: 99%

Environmental and stomatal control on evapotranspiration in a natural oak forest

Niu

Liu

2022

Ecohydrology

View full text Add to dashboard Cite

show abstract

Progress in water and energy flux studies in Asia: A review focused on eddy covariance measurements

Kang¹,

Cho

2021

J. Agric. Meteorol.

View full text Add to dashboard Cite

The eddy covariance EC technique-based observation system allows for researchers to determine latent and sensible heat fluxes, which are key components of the surface energy balance. The number of water and energy flux studies in Asia has increased as the number of flux measurement sites and the length of the observation periods have grown. To retrace the footprints of the AsiaFlux network and predict future research directions, we reviewed the progress in water and energy flux studies in Asia from the 1990s to the present day. This included studies on continuous evapotranspiration ET and surface energy balance measurements in various ecosystems, from the tropics to the polar regions. We also reviewed comparative experiments between the EC technique and other observation techniques including the use of a lysimeter or scintillometer, data processing techniques, connections between carbon and water fluxes, and multi-site syntheses. This paper discusses three remaining challenges that are hindering the derivation of scientific knowledge for ET and the surface energy balance, namely: the non-closure of the surface energy budget, imperfect compatibility between open-and closed-path gas analyzers, and difficulty in partitioning ET into evaporation and transpiration. If we leverage the advantages of the EC technique i.e., high sampling rates of ≥ 10 Hz and continuous measurement capabilities , standardized methods for correcting and partitioning can be developed in the near future.

show abstract

Stomatal and environmental control on evapotranspiration in a plantation in the lower mountain areas of North China

Cited by 2 publications

References 0 publications

Environmental and stomatal control on evapotranspiration in a natural oak forest

Environmental and stomatal control on evapotranspiration in a natural oak forest

Progress in water and energy flux studies in Asia: A review focused on eddy covariance measurements

Contact Info

Product

Resources

About