草本与木本植被类型土壤有机碳库特征及形成机制

bout one-third and one-half of the land surfaces has been transformed by land-use and land-cover change. Deforest, afforestation, and woody plant encroachment are the main forms of vegetation change, which always accompanied with shifting of the abundance of woody and herbaceous vegetation types (e.g., grasses, shrubs, and trees). After vegetation types changing, primary production, rooting depth and soil faunal communities were shift, in turn, nutrient cycling and carbon storage would be impacted. Generically, forest restore is thought would sequestrate more atmosphere carbon, but carbon sequestration through aboveground biomass increasing may be offset by soil organic carbon loss. After vegetation cover was shifted, SOC stock usually changing violently at the beginning several years and gradually slow down during the following years. The violent change may due to swift loss and gain of DOC (dissolved organic carbon) derived from different plant vegetation types, and Rate of DOC renew is affect by property of SOC derived from former vegetation and by intensity of disturb when vegetation was change. Thus studies of SOC character (composition and allocation) and sequestration dynamic under different vegetation types (herbaceous vs. woody) would be help to estimate SOC storage and to improve system carbon sequestrate management levels.