all areas of soils disturbed by human development activities, such as those

admin

试卷: SITES AP英文问答（v2）A[查看]
all areas of soils disturbed
by human development activities, such as those
that have been affected by grading, excavation, or compaction. Indicators of disturbed soils may
include one or more of the following:
••Soil horizons that differ significantly in either
depth, texture, or physical or chemical
properties from the reference soil
••Bulk densities that exceed the maximum allowable
bulk densities shown in Construction P7.3:
Restore soils during construction Figure 7.3-A
••Organic matter content lower than that of the
reference soil
••Soil chemical characteristics (parameters such
as pH, salinity, cation exchange capacity,
and nutrient profiles) different from that of the
reference soil
••Presence of compounds toxic to the intended
plants
••Presence of weedy, opportunistic, or invasive
plant species





本题解释:
disturbed soils