森林生态系统碳循环研究进展

针对森林生态系统碳循环在全球碳循环中的重要作用,综述了国内外森林生态系统碳循环的研究进展,包括森林生态系统植物和土壤碳固定、森林群落和土壤的碳释放、森林生态系统碳平衡和碳循环模型等方面,并指出今后的研究方向。

Review on carbon cycle of forest ecosystem

The carbon cycle of forest ecosystems plays an important role in the global carbon cycle, which is closely related to CO2 concentration in atmosphere and has an obvious effect on composition of atmospheric elements. The advances in the studies on carbon cycle of forest ecosystems at home and abroad are reviewed in this paper. The vegetation organic carbon and soil organic carbon pool of forest ecosystems are 359PgC and 1220PgC, accounting for more than 86% of total vegetation carbon organic pool, 73% of soil carbon pool of terrestrial ecosystems, respectively, so the forest ecosystem is a big carbon pool. On the other hand, forest community and forest soil respiration are major ways of carbon dioxide flux from forest ecosystems to atmosphere, which increase the concentration of CO2 in atmosphere to a certain extent. Soil emission represents the largest terrestrial source of CO2 to the atmosphere, which has diurnal and seasonal dynamic changes, and is affected by environmental factors such as temperature, humidity, etc. , and would actively responses to the increasing concentration of CO2 in atmosphere. At present, the critical issue in understanding the global carbon cycle is the "missing sink"of CO2 in atmosphere, being 1.7PgC, which is generally thought to be located in middle latitude region of land in the earth owing to the broad distribution and high productivity of coniferous forest ecosystems. Many researches on carbon cycle models have been done based on varied hypotheses, parametric coefficients and purposes. Proposals on carbon cycle of forest ecosystems and the direction of study in future are presented, which will contribute to a better understanding on the relationship between the global climate changes and forest ecosystems.