凋落物是森林生态系统的重要组成部分,其作为养分的基本载体,在养分循环中是连接植物与土壤的"纽带",其碳库直接影响着土壤碳库及森林生态系统的碳库。本文以西藏高原冷杉、云杉、高山松、云南松、高山栎、柏木森林类型为研究对象,采用直接收获法对森林凋落物碳储量进行研究。结果显示:凋落物碳储量随着龄级的增大而增加;凋落物碳储量随海拔的升高而增加,在3200~3600 m碳储量最大,随后碳储量开始下降;林芝地区凋落物碳储量最大,其次是山南地区和日喀则地区,最小的是昌都地区。 更多还原
 

Litter is an important linkage between plant and soil in nutrient cycles because it is not only a key component consisting of forest ecosystems,but also is the essential carrier for nutrients. Thus,changes of carbon stock in litter can directly affect the carbon stocks in soil and forest ecosystems. In this study Abies georgei var. smithii,Picea asperata,Pinus densata,Pinus yunnanensis, Quercus semecarpifolia,Cupressus funebris forests in the Tibetan Plateau were selected as target vegetation types,and a direct harvesting method was employed to collect litter in the study sites. In general,carbon storage of litter showed a tendency of higher values with increasing stand ages. Additionally,the carbon storage of litter firstly increased with increasing elevation, and then a subsequent decrease in carbon storage occurred with increasing elevation. The largest carbon storage value was observed in sites with elevations ranging from 3200 to 3600 m. Spatially, the largest carbon storage value occurred in Linzhi,followed by Shannan and Shigatse,and the lowest in Changdu.