Wang, Siang-Heng王祥恒

Postdoctoral Research Fellow

Research Interests

Flux measurement is a valuable inversion method that can close to realistic situations to estimate how much heat, water vapor, greenhouse gas, and other gases go through the land surface. However, flux measurement is hard to establish in segmented landscapes, such as variable terrain and diverse land-use types in Taiwan. Local measurement can capture real-time and detailed information, including flux and accessory data, such as radiation, weather data, and timelapse video. Aircraft and payloads can scan the data in more extensive area than local measurements but sacrifice the time resolution. Remote sensing can scan more areas in a shorter time, but the images may not be used when cloudy. I am interested in how to merge different time and space scale data to explore the flux in larger areas and shorter time scales. Although the integration may lose some detailed information when looking at a smaller scale, the overall results may upgrade the modern flux estimation based on remote sensing inversion.

Representative Publications

Wang, S.-H. and Juang J.-Y.* (2023). “Different management strategies exert distinct influences on microclimate in tea fields through soil-atmosphere interactions,” Agricultural Water Management, Under Review.

Wang, S.-H. and Juang J.-Y.* (2022). “Quantifying the influence of management strategies on surface radiation budgets and energy patterns in tea fields,” Environmental Research Letters, vol. 17, no. 3, 034041. doi:10.1088/1748-9326/ac4361

Research

Eddy-covariance (EC) method is helpful in measuring the microclimate; however, it is seldom used in small fetches, such as the piecemeal farmland in Taiwan. Besides, how the land-use type affects the energy budget is critical to the policy-making for future climate scenarios; however, how the different management methods in farmland affect the microclimate is rarely discussed. My dissertation used two sets of EC equipment to measure and analyze the difference in microclimate parameters between two tea fields within different management strategies, organic-certificated vs. conventional. The outlines and brief introductions are listed in the CV.

The results found that the tea tree canopy coverage established by the farmers changes the energy partition and the patterns of soil temperature and moisture. In the organic-certified field, the farmer keeps the larger canopy for more harvest because of the higher price of hand-pick-up organic tea. Moreover, the canopy in the conventional field is shorter for convenient harvest by machine. The result of energy partition coming from these fields is that more latent heat flux and less sensible heat flux had been measured in the organic-certified field. Besides above ground, the diurnal soil temperature range is higher, and the daily loss rate of soil water content is lower in the conventional field. The daily loss rate of soil water content responds to more latent heat flux in organic-certified fields. The results of energy partition had published in Environmental Research Letters (Wang and Juang, 2022), and the results of soil measurement are under review in Agricultural Water Management.

  • Ph.D.
    International Doctoral Degree Program in Climate Change and Sustainable Development,
    National Taiwan University, Taiwan (2022)
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