Lennartz et al. (2009) and Zhang et al. (2013)found a larger
shrinkage capacity in old paddy soils than in young paddy soils,
which were attributed the difference to a lower bulk density
(Lennartz et al., 2009) and a greater SOC concentration and less
intensive drying (Zhang et al., 2013) in the old paddyfield.Deng
et al.