2.2 Soil physical and chemical characteristics
Soil bulk density, total porosity and pH for various treatments were
shown in Table3. The soil bulk density gradually increased in TS and
increased in TSD and TD with the increase of soil depth. Compared with
TS, the TSD and TD significantly increased the soil bulk density in the
0-30 cm soil depth. Soil bulk density was in order of TS < TSD
< TD in same soil layers. The soil total porosity showed the
opposite trend as changes in soil bulk density, and the pH showed the
same trend as changes in soil bulk density except the pH in 10-20cm soil
layer (TS < TD < TSD). Except TS, the total N
gradually increased with the increase of soil depth. From Table4,
compared with TS, the TSD and TD significantly decreased the soil total
N in the 0-30 cm soil depth, and soil total N in same soil layers was in
order of TD < TSD < TS. The SOC showed the same
trend as changes in total N (Table4). The total P in same soil layers
was in order of TSD < TD < TS (Table4), and the TSD
and TD significantly decreased the total P in the 0-30 cm soil depth
compared with TS. Available P showed the same trend as changes in total
P (Table3). The available K in same soil layers was in order of TSD
< TS < TD, except in 0-10cm soil layers (Table3).