can have a significant impact on results.
To understand the limits of sustainable land
use, we must determine what are the critical biological
indicators of soil quality and their
thresholds and hence of soil sustainability. Soil
resilience is an important attribute in understanding
the soil's response to degradative processes,
and has been highlighted in the international scientific
arena as an issue of global concern, especially
under current agricultural land use practices
(Lal, 1993; Greenland and Szabolcs, 1994). There
is a need to test theories in the area of soil
resilience that include the critical limits of a property
from which the soil can recover to the initial
state, and the rate of that recovery. We need to
look beyond the traditional soil biota experiments
that have largely examined aspects of biodiversity
at species level--by quantifying composition,
abundance or activity variation with land management
practices. We need to develop rigorous
experiments that measure soil biota at various
levels (population or community or biological
process level), and relate these changes to soil
quality/soil health. With sound experimental evidence
we can indicate to the farmer whether the
soil resource they rely on is declining in quality/
condition, is stable or in a process of renewal. By
examining the relationship between soil macrofauna
and soil structure, and levels and types of
organic carbon, we could use soil macrofauna as a
surrogate/integrative measure of soil processes essential
to ecosystem functioning--nutrient cycling
(Andersen and Sparling, 1995), and to transporting
nutrients, air and water.
can have a significant impact on results.
To understand the limits of sustainable land
use, we must determine what are the critical biological
indicators of soil quality and their
thresholds and hence of soil sustainability. Soil
resilience is an important attribute in understanding
the soil's response to degradative processes,
and has been highlighted in the international scientific
arena as an issue of global concern, especially
under current agricultural land use practices
(Lal, 1993; Greenland and Szabolcs, 1994). There
is a need to test theories in the area of soil
resilience that include the critical limits of a property
from which the soil can recover to the initial
state, and the rate of that recovery. We need to
look beyond the traditional soil biota experiments
that have largely examined aspects of biodiversity
at species level--by quantifying composition,
abundance or activity variation with land management
practices. We need to develop rigorous
experiments that measure soil biota at various
levels (population or community or biological
process level), and relate these changes to soil
quality/soil health. With sound experimental evidence
we can indicate to the farmer whether the
soil resource they rely on is declining in quality/
condition, is stable or in a process of renewal. By
examining the relationship between soil macrofauna
and soil structure, and levels and types of
organic carbon, we could use soil macrofauna as a
surrogate/integrative measure of soil processes essential
to ecosystem functioning--nutrient cycling
(Andersen and Sparling, 1995), and to transporting
nutrients, air and water.
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