Study on the Water and Heat Fluxes of a Very Humid Forest Ecosystem and Their Relationship with Environmental Factors in Jinyun Mountain, Chongqing

The high-humidity mountain forest ecosystem (HHMF) of Jinyun Mountain in Chongqing is a fragile that sensitive to climate change and human activities. Because it shrouded fog year-round, illumination the area seriously insufficient. However, flux (energy, water) exchanges (FEs) this their influencing factors are not clear. Using one-year data from towers with double-layer (25 m 35 m) eddy covariance (EC) observation system, we proved applicability EC method on rough underlying surfaces, quantified FEs HHMFs, found part might also be observed by method. time was separated day night, then environmental control determined stepwise regression analysis. Through water balance, proven negative value evapotranspiration (ETN), which represented vapor input atmosphere ecosystem, could ignored provided new idea for possible causes evaporation paradox. results showed annual average daily sensible heat (H) latent (LE) ranged −126.56 131.27 W m−2 −106.7 222.27 m−2, respectively. (ET), positive (ETP), (ETN) values were 389.31, 1387.76, −998.45 mm, energy closure rate ecosystems 84%. Fog ETN an important source HHMF. Therefore, study divided into subtropical cloud forests (STMCFs). Stepwise analysis H LE during mainly radiation (Rn) temperature (Tair), indicating limited, future warming may enhance ecosystem. Additionally, controlled wind speed (WS) whole period, WS affected altitude differences within city. more likely occur mountains near island cities tropical regions. This emphasizes fog, as source, easily most methods there will large amount warming, can explain