2.3. Soil sampling and soil physicochemical analysis
In August 2011, six soil samples were randomly collected from
each plot at 0e10 cm depth using a 8.7 cm diameter soil-corer for
both trenched and untrenched treatments (a control) (Wang et al.,
2010b) two samples were randomly taken from each trenched
subplot, and then were pooled together by soil depth. During
sampling within a plot, the corer was wiped clean of obvious soil
particles with paper towel. All samples were stored at 20 C and
sieved