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Comparison of soil moisture dynamics between a tropical rain forest and a tropical seasonal forest in Southeast Asia: Impact of seasonal and year‐to‐year variations in rainfall
Author(s) -
Kumagai Tomo'omi,
Yoshifuji Natsuko,
Tanaka Nobuaki,
Suzuki Masakazu,
Kume Tomonori
Publication year - 2009
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2008wr007307
Subject(s) - environmental science , wet season , precipitation , dry season , tropics , tropical vegetation , water content , ecosystem , monsoon , rainforest , seasonality , climatology , ecology , geography , geology , meteorology , geotechnical engineering , biology
We examined the impact of both seasonal and year‐to‐year variations in precipitation on simulated soil moisture dynamics at a tropical rain forest (TRF) site and a tropical seasonal forest (TSF) site in Southeast Asia, between which there is a clear difference in the precipitation regime, through a probabilistic ecohydrological model. All model parameters have apparent physical meaning and were obtained by field observations. Rainfall statistics as the primary model forcing terms were constructed from long‐term rainfall records, and their analysis revealed a close relationship between drought and El Niño events at the TRF site and a long‐term drying trend at the TSF site. The model results further demonstrated that the studied ecosystem's robustness (mainly concerning the plant water availability) are attributed to functional factors such as soil texture for the TRF site and rooting depth and the dry season use of water from the preceding wet season for the TSF site.