Soil Characteristics in the Clearcut Site at Harvard Forest 2012

Soil properties (C:N ratio, pH, soil moisture, bulk density, litter layer thickness) were measured at the clear cut site in December 2012. Measurements were taken inside the large PVC collars that were used to measure soil respiration at the sites during the 2012 growing season. The collars were removed for storage thereafter. 15 locations in total were sampled: 3 collars were in trenched plots, and 12 on untrenched soil. Soil properties were collected in order to help interpret spatial variability in the corresponding soil CO2 fluxes measured at the site.2012年12月，研究人员在皆伐样地（clear cut site）内测定了多项土壤属性，涵盖碳氮比（C:N ratio）、pH值、土壤含水量、土壤容重（bulk density）及枯落物层厚度（litter layer thickness）。本次测定点位设置于2012年生长季期间用于该样地土壤呼吸（soil respiration）观测的大型PVC环（PVC collar）内部。测定完成后，这些PVC环被取下并妥善保存。本次研究共布设15个采样点位：其中3个PVC环位于切根样地（trenched plot）内，剩余12个布设于非切根土壤区域。采集上述土壤属性数据的目的在于辅助解析该样地同期观测得到的土壤CO₂通量的空间变异性。