Scientia et Technica Año XXVIII, Vol. 30, No. 01, enero-marzo de 2024. Universidad Tecnológica de Pereira
Based on this, agroforestry practices have proven to be an
effective strategy for providing potable water. Among these,
agroforestry systems include riparian buffers that contribute to
the cleansing of runoff water by slowing its velocity, promoting
infiltration, sediment deposition, and nutrient retention. A
buffer of switchgrass (Panicum virgatum) and woody stem
removed 20% more nutrients. In addition, trees with deep root
systems can improve groundwater quality by acting as a “safety
net”, recycling nutrients through root turnover and litterfall,
which improves the efficiency of nutrient use in the system.
Studies have reported this mechanism in both tropical and
temperate regions, suggesting that agroforestry systems could
play a substantial role in mitigating water quality problems
generated by intensive agricultural practices [11].
On the other hand, in the Brazilian semi-arid region,
inadequate soil management practices have exacerbated erosive
processes. In this context, agroforestry systems have been
identified as a viable alternative to reduce water erosion. The
evaluation of the impact of two agroforestry systems (one
traditional and one intensive) in comparison with natural
vegetation and a conventional agricultural system, revealed that
agroforestry systems were more efficient in reducing water
erosion, reducing contamination and loss of water quality.
Therefore, their adoption is recommended as a sustainable
technical alternative for food production in the region [12].
Likewise, the integration of trees into pastures has proven to
be an effective strategy to mitigate water pollution. Studies
comparing three types of pastures - one without trees (Paspalum
notatum), a pasture under 20-year-old pines (Pinus elliotti) and
a pasture of native vegetation under pines - concluded that
silvopastoral systems allow a more efficient uptake of nutrients,
especially phosphorus, compared to pastures without trees. In
addition, the capacity of soils under these systems to receive
additional phosphorus is greater, thus reducing nutrient
leaching to surface water and mitigating water pollution [13].
Finally, the adaptation of agricultural systems to climate
change is crucial, given that this phenomenon can generate
negative impacts on agricultural production. According to Lin
[14], the resilience of agricultural systems can be improved
through greater crop diversification. However, there are barriers
such as economic incentives to produce specific crops, the
focus on biotechnological strategies and the perception that
monocultures are more productive. In this regard, crop and
landscape simulation models can help farmers find optimal
strategies to maintain production and profitability.
Understanding the potential for greater diversity within
agricultural systems is essential for coping with climate
variability. By adopting practices that foster ecosystem services
for pest control, disease and climate resilience, farmers can
reduce the risk of production losses and strengthen their
capacity to adapt to environmental changes.
In summary, this review has addressed, in the first instance,
the definition of agroforestry systems, followed by the
problems derived from conventional agriculture and, finally,
the specific benefits of agroforestry practices, highlighting their
relevance in climate change adaptation and water conservation.
D. Structural documents (Trunk)
Within the structural documents of the knowledge tree, key
trends in research development are identified, particularly in the
following areas:
Agroforestry systems, which combine trees with crops or
pastures, have been widely implemented in temperate and
tropical regions due to their effectiveness in reducing water, soil
and nutrient loss, as well as mitigating water pollution
generated by agricultural activities. However, despite their
widespread use, there are still few scientific reviews that
comprehensively evaluate their efficiency and scope,
considering factors such as soil type, management practices,
climatic conditions and the hydrological processes involved.
Therefore, it is essential to develop systematic studies that
allow the generalization of agroforestry design and its
adaptability in regions with similar climatic, geographic,
ecological and socioeconomic characteristics worldwide [15].
The progressive deterioration of surface and groundwater
quality in recent decades has increased interest in identifying
sources of contamination. Agricultural intensification, driven
by the need for high quality crops and high yields, has led to
excessive use of fertilizers and pesticides, resulting in negative
impacts on the environment, especially on soil and water
bodies. A study conducted in experimental agricultural fields in
the Mediterranean, in which N, P and K ions, as well as the
herbicides pendimethalin, its metabolite M455H001 and s-
metolachlor, together with the insecticide chlorpyrifos, were
analyzed, showed that agroforestry systems, such as corn-
poplar and potato-poplar associations, can significantly
decrease water pollution. In particular, tree roots have the
capacity to absorb excess agrochemicals, preventing them from
leaching into groundwater by leaching or being transported to
surface water by runoff [16].
On the other hand, multiple studies have shown that land use
patterns significantly influence water infiltration capacity.
Increasing infiltration and reducing runoff are fundamental
aspects for soil and water resource conservation, especially in
semi-arid environments. In this regard, research conducted on
the Loess Plateau in China compared three planting systems
over 11 years and concluded that agroforestry systems
significantly improve soil infiltration and soil sustainability,
particularly in semi-arid areas. These findings offer new
insights into the applicability of agroforestry in regions with
similar conditions around the world [17].
In recent decades, it has become evident that agroforestry not
only contributes to the protection of natural resources, but also
allows maintaining or increasing agricultural productivity. In a
study developed in Xishuangbanna, southwest China, Wu JN
[18], evaluated a rubber-based agroforestry system, finding that
intercropping with legumes significantly improved water use
efficiency and tree tolerance to adverse conditions. The rubber
trees showed more stable physiological indices and higher
water efficiency, suggesting that this strategy is highly
beneficial for water conservation.
Finally, Panwar's [19], study examined the effectiveness of
agroforestry systems for soil and water conservation on sloping
land in the Shivalik region of India. By combining
silvihortipastoral practices and the implementation of water
harvesting structures, a significant reduction in soil loss was