Abstract:
Challenges of land use type and soil depth have serious effects on soil properties. Thus,
assessing land use types in soil properties are necessary for agro-ecosystem transformation.
This study was conducted in Shemit watershed Northwest Ethiopia, with the objective of
investigating the effects of land use type on soil properties. Four land use types: natural forest,
cultivated land, grazing land and plantation forest were selected to determine the effect of land
use types on soil properties. A total of 24 disturbed composite and 24 undisturbed core soil
samples were collected from the four land use types at two soil depth in triplicates. The soil
samples were prepared and analyzed in the laboratory following the standard procedures. The
result showed that cultivated land and settlement increased by 3.65% and 6.33%, respectively
while, the forest and grazing lands were declinead by 2.76% and 7.23%, respectively from 1989
to2019. Sand, clay, bulk density, pH, OM, total N, available phosphorus, exchangeable bases
(Ca, Mg, K, Na), CEC and PBS were significantly (p < 0.05) affected by land use type. In
contrast, silt and C: N ratio were not significantly (p > 0.05) affected by land use. Considering
soil depth, only sand, OM, exchangeable Na and PBS were significantly (p < 0.05) varied. The
highest mean pH (6.34), SOM (5.32%), TN (0.28%), Av.P (6.24 mg/kg), Ca (14.13 cmol
c
),
K (1.11 cmol
c
kg
-1
) and CEC (28.77 cmol
c
kg
-1
) were recorded under natural forest and the
lowest values except for total N, OM, Av.P and CEC were found under plantation forest. The
mean value of clay, BD, pH, exchangeable bases and PBS were increased down a depth,
whereas, sand, silt, TN, OM and CEC were decreased with increase soil depth. A change from
natural forest to other land use types caused a significant decline in soil fertility parameters.
Therefore, Shemit watershed needs immediate intervention and implementation of sustainable
land management to protect the remnant natural forests and to improve agricultural
productivity.
kg
-1