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  • Print publication year: 2011
  • Online publication date: May 2011

40 - Fog deposition and chemistry in a sub-tropical montane cloud forest in Taiwan

from Part IV - Nutrient dynamics in tropical montane cloud forests

Summary

ABSTRACT

Annual fog deposition and atmospheric chemical deposition were evaluated for a strongly fog-affected coniferous forest at Chi-Lan, Taiwan. Fog capture efficiencies of Chamaecyparis obtusa var. formosana leaves were measured at three heights within the canopy using in situ exposure experiments under contrasting climatic conditions. The efficiencies obtained in this way were multiplied times leaf biomass to calculate stand-level fog deposition rates. Furthermore, a statistical model was developed, linking fog deposition rate to visibility. Using the latter model, annual fog deposition from March 2003 to February 2004 was calculated to be 297 mm, or ~9% of the total atmospheric water input. Fog contributions exhibited a highly seasonal pattern that depended mainly on the amount of precipitation. Due to the higher chemical concentrations of fog compared to precipitation, nutrient deposition via fog played a significant role. Inorganic nitrogen was absorbed by the canopy whereas potassium was leached. It is concluded that fog constitutes an important factor influencing the water and nutrient dynamics of the montane forest ecosystem under study.

INTRODUCTION

The concept of a “montane cloud forest belt” has been recognized in Taiwan for decades (Su, 1984). Although there were few meteorological records on cloud heights at the time, the elevational range of the cloud belt was inferred from temperature lapse rates as calculated from data of more than 150 weather stations (Su, 1984).

References
Asbury, C. E., McDowell, W. H., Trinidad-Pizarro, R., and Berrios, S. (1994). Solute deposition from cloud water to the canopy of a Puerto Rican montane forest. Atmospheric Environment 28: 1773–1780.
Beiderwieden, E., Wolff, V., Hsia, Y. J., and Klemm, O. (2008). It goes both ways: measurements of simultaneous evapotranspiration and fog droplet deposition at a montane cloud forest. Hydrological Processes 22: 4181–4189.
Chang, S. C., Lai, I. L., and Wu, J. T. (2002). Estimation of fog deposition on epiphytic bryophytes in a subtropical montane forest ecosystem in northeastern Taiwan. Atmospheric Research 64: 159–167.
Cheng, J. D., Lin, L. L., and Lu, H. S. (2002). Influences of forests on water flows from headwater watersheds in Taiwan. Forest Ecology and Management 165: 11–28.
Clark, K. L., Nadkarni, N. M., Schaefer, D., and Gholz, H. L. (1998). Cloud water and precipitation chemistry in a tropical montane forest, Monteverde, Costa Rica. Atmospheric Environment 32: 595–1603.
Demoz, B. B., Collett, J. L., and Daube, B. C. (1996). On the Caltech Active Strand Cloudwater Collectors. Atmospheric Research 41: 47–62.
Hafkenscheid, R. L. L. J. (2000). Hydrology and biogeochemistry of tropical montane rain forests of contrasting stature in the Blue Mountains, Jamaica. Ph.D. thesis, VU University Amsterdam, Amsterdam, the Netherlands. Also available at http://dare.ubvu.vu.nl/bitstream/1871/12734/1/tekst.pdf.
Klemm, O., Wrzesinsky, T., and Scheer, C. (2005). Fog water flux at a canopy top: direct measurement versus one-dimensional model. Atmospheric Environment 39: 5375–5386.
Klemm, O., Chang, S. C., and Hsia, Y. J. (2006). Energy fluxes at a subtropical mountain cloud forest. Forest Ecology and Management 224: 5–10.
Langusch, J. J., Borken, W., Armbruster, M., Dise, N. B., and Matzner, E. (2003). Canopy leaching of cations in Central European forest ecosystems: a regional assessment. Journal of Plant Nutrition and Soil Science 166: 168–174.
Lin, N. H., and Peng, C. M. (1998). Chemistry of mountain clouds observed in the northern Taiwan. In Proceedings of the 1st International Conference on Fog and Fog Collection, eds. Schemenauer, R. S. and Bridgman, H. A., pp. 117–120. Ottawa, Canada: IDRC.
Lovett, G. M. (1984). Rates and mechanisms of cloud water deposition to a subalpine balsam fir forest. Atmospheric Environment 18: 361–371.
Lovett, G. M. (1994). Atmospheric deposition of nutrients and pollutants in North America: an ecological perspective. Ecological Applications 4: 629–650.
Su, H. J. (1984). Studies on the climate and vegetation types of the natural forests in Taiwan. II. Altitudinal vegetation zones in relation to temperature gradient. Quarterly Journal of Chinese Forestry 17: 57–73.
Vong, R. J., and Kowalski, A. S. (1995). Eddy correlation measurements of size-dependent cloud droplet turbulent fluxes to complex terrain. Tellus Series B 47: 331–352.
Zall, D. M., Fisher, D., and Garner, M. Q. (1956). Photometric determination of chlorides in water. Analytical Chemistry 28: 1665–1668.