執行成果摘要
Temperature is an extremely important factor in the ecosystem. It plays an important role in soil chemical reactions, physical characteristic development, and biological interactions. Therefore, it exerts a major influence on biological activities and growth, water chemistry, soil structure and aeration capacity, decomposition of organic matters and phenomenon of phenology. The primary important temperatures in forestry ecosystem are air temperature, top soil temperatures and stream temperature. Those temperatures in ecosystem affect each other and vary temporally and spatially in response to changes in radiant energy, thermal and latent energy which take place primarily at the soil surface. However, every limited works in investigating those temperatures in the same plot have been carried out especially on a forest environment. Therefore this project will monitor air temperatures inside and out side of forest canopy, streamflow temperature and temperatures of topsoil layers of 5, 30 50 and 80 cm below soil surface for the riparian zones of Harpen creek in Fushan Experimental Forest and Choliao creek in Liukuei Experimental Forest. Water sample will be collected and analyze its chemical properties and the species and amount of aquatic hyphomycetes and insects will also be investigated every month. Up to present, the project has monitored temperatures related to riparian environment and obtained average temperatures for air, streamflow, 5 cm, 30cm and 50 cm of Choliao creek are 21.3、20.2、23.1、22.8及23.4℃ and those temperatures for Harpen creeks are 9.2、22.9、19.0、19.6及19.4℃. We has observed 44 species of aquatic hyphomycetes and species of .Alatospora acuminate, Campylospora chaetocladia、Flagellospora curvula, Tetrachaetum elegans, chaetocladia, Clavatospora tentacula, F. curvula, Lunulospora curvula, Lunulospora cymbiformis, Tetracladium marchalianum are the majority。The highest concentration of anion and action of the Harpen creek are HCO3- and Ca+2, respectively. In addition, the project also found that the minimum average monthly temperature in September and October requirement for blooming of Mikania micrantha is about ℃. We also have carried the analysis of the influences of temperature on streamflow chemical properties and the occurrence frequency and species of aquatic hyphomycetes. Hopefully those investigations will provide knowledge for riparian of the study areas.