Abstract:
We explore the soil physical characteristics in wetland of Barito Delta from primary data
of soil sample and electrical resistivity measurement with the support from some
secondary data. We also estimate saturated hydraulic conductivity (Ks) in Barito Delta
from soil physical characteristics applying Saxton and Rawls (1986) and Weynants et al.
(2009). Soil texture profile is determined from interpolation of soil fraction in each layer
applying Bayesian statistics to analyze soil physical characteristics in the landforms of
Delta. Clay is the dominant soil fraction in the soil of Barito Delta. Clay fraction percentage
decrease along the depth of soil profile as it reaches fine sand particles deriving from
ancient sedimentation from the past. It is an opposite with soil organic matter content
that has contrast value from 1st to 2nd soil depth, but a few discrepancy from 3rd depth to
downward direction. The content of clay in the soil depends on the sedimentation activity
in the landform. Clay is dominant soil particle in the Delta; in case, it is in flat area and
there is no intensive of sea water sedimentation such as in Basin of Peat Anticline and
Natural Levee. In more than 2 m depth of soil, loamy sand and silty clay textures are
mostly in the landform that is influenced by sea water activity, while by river water is clay
loam. Ks values from Saxton and Rawls (1986) are close to Ks values from the
measurement of previous studies. Ks values are generally small in Barito Delta that is
mostly ranging from 1.10−7 to 2 m s−1. Ks values are larger following the depth of soil
profile. The values of Ks are smaller in Basin of Peat Anticline and Natural Levee than in
Tidal Flat and Beach Ridge. It is because both landforms have clay as dominant soil
particles.
