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| Articles
by
Feng Du |
Total Records (
1 ) for
Feng Du |
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Fengpeng Han
,
Jiyong Zheng
,
Wei Hu
,
Feng Du
and
Xingchang Zhang
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Inappropriate land use is one of the main reasons for soil erosion and nutrient
loss in the hilly loess area of the Liudaogou catchment of the Loess Plateau,
a typical topography area of hills and gullies. Good management practices, such
as the nutrient variability for the different land uses (woodland, grassland,
shrub land, farmland, and gully), would help the farmers. One study of the use
of Geographic Information System (GIS) spatial analysis and geostatistic analysis
was carried out in the catchment. The results showed that the trend of the content
of clay and silt in the different soil ranks was: farmland < grassland <
shrub land < gully soil. The sandy soil contained fewer nutrients than did
the other soils. The farmland contains fewer total phosphorus (TP) and NH+4-N
. The spatial dependence of the total nitrogen (TN) and the organic matter (OM)
in the sandy soil is strong, but is only moderate in the other types of land use
except for OM in farmland. The spatial dependence of TP in the different types
of land use patterns is strong too, except in woodland, and the dependence of
TP is moderate in grassland. The spatial dependence of NO-3-N
and NH+4-N is not strong, especially
NO-3-N in woodland, shrub land, and farmland. The dependence
of NH+4-N
is weak in grassland, gully, and farmland. In the
catchment scale, the degree of spatial dependence (GD) is moderate for soil nutrients
especially for TN and NH+4-N
, but the different nutrients were modelled in different
stationary models. The spatial variability of OM, TP, and NH+4-N
was modelled by a Gaussian model, and the spatial
variability of TN and NO-3-N
was modelled by an exponential equation. The nutrients'
distribution in the catchment has been mapped by GIS. From the results, it was
seen that annual grass played an important role in the conservation and improvement
of soil quality in the Loess Plateau. In addition, the farmland should be given
more fertilizer. |
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