Abstract:

Soil organic carbon approved affected by intensive practice. Phyllostachy pubescens forest has been managed in intensive way for long term in order to get higher economic profits. Soils under intensive management (IM) for 5, 10, 20 and 40 years respectively were compared with the soil of extensive practice. The result showed: Soil total organic carbon (TOC), microbial biomass carbon (MBC), water-soluble organic carbon (WSOC) and mineralize carbon(MC) decreased greatly (P<0.05) after 5-year intensive practice; Soil TOC was continuing going down until 20-year, however, WSOC and MC kept constant after 5-year till 40-year. Soil TOC and MBC decreased by 34.70% and 49.35% respectively with the intensive practice in 20 years.The vertical distribution feature of different soil organic carbon were not altered by intensive practice in the soil section, the amount of organic carbon have decreased in the similar soil layer. Intensive practice caused a big loss of soil carbon and degradation of soil biological properties. It is recommended to amend the amount of organic matter or fertilizer annually to sustain the soil quality.

Key words: Phyllostachy pubescens, intensive practice, extensive practice, soil, organic carbon