Effect of bamboo harvest on dynamics of nutrient pools, N mineralization, and microbial biomass in soil

摘要

The effect of harvesting bamboo savanna on the dynamics of soil nutrient pools, N mineralization, and microbial biomass was examined. In the unharvested bamboo site NOinf3sup--N in soil ranged from 0.37 to 3.11 mg kg-1soil and in the harvested site from 0.43 to 3.67 mg kg-1. NaHCO3-extractable inorganic P ranged from 0.55 to 3.58 mg kg-1in the unharvested site and from 1.01 to 4.22 mg kg-1in the harvested site. Over two annual cycles, the N mineralization range in the unharvested and harvested sites was 0–19.28 and 0–24.0 mg kg-1soil month-1, respectively. The microbial C, N, and P ranges were 278–587, 28–64, and 12–26 mg kg-1soil, respectively, with the harvested site exhibiting higher values. Bamboo harvesting depleted soil organic C by 13 and total N by 20. Harvesting increased N mineralization, resulting in 10 kg ha-1additional mineral N in the first 1st year and 5 kg ha-1in the 2nd year following the harvest. Microbial biomass C, N and P increased respectively by 10, 18, and 5 as a result of bamboo h