{{menu_nowledge_desc}}.

CIFOR–ICRAF publishes over 750 publications every year on agroforestry, forests and climate change, landscape restoration, rights, forest policy and much more – in multiple languages.

CIFOR–ICRAF addresses local challenges and opportunities while providing solutions to global problems for forests, landscapes, people and the planet.

We deliver actionable evidence and solutions to transform how land is used and how food is produced: conserving and restoring ecosystems, responding to the global climate, malnutrition, biodiversity and desertification crises. In short, improving people’s lives.

Dynamics of soil physical properties under alternative systems to slash - and - burn

Export citation

A change from slash-and-burn to continuously cropped agricultural systems is occurring in heavily populated areas in the humid tropics. Well managed alternative systems to slash-and-burn can reduce soil structure deterioration maintain soil fertility and promote long-term productivity. The objectives of this paper are to describe the dynamics of soil physical properties under slash-and-burn and some alternative systems. Different land-clearing methods and post land-clearing management systems were evaluated on Typic Paleudults at Yurimaguas Peru for their effects on soil physical properties such as: bulk density soil water characteristic infiltration rate aggregate stability and penetrometer cone resistance. Mechanical clearing reduced the infiltration rate from 420 mm h−1 before clearing to 35 mm h−1 for the straight blade and 95 mm h−1 for the shear-blade bulldozing. Straight-blade clearing damaged soil structure the most as indicated by a decrease in the percentage of larger soil aggregates. The practice of planting on raised beds prevented foot compaction of soil near the plants; bulk density was 1.14 and 1.29 Mg ha−1 for bedded and flat planted soil respectively. Of the various agroforestry systems evaluated (multistrata peach palm production shifting agriculture low input and high input continuous cropping) bulk density was lower after 4 years for the systems with trees or cover crops. Mean annual soil loss for alley cropping on sloping soils was 0.2 Mg ha−1 year−1 compared with 53 Mg ha−1 year−1 for two annual crops per year. The infiltration rate after 5 years of intensive grazing on five associations of legumes with grasses was reduced from 127 to 41 mm h−1. Overgrazing caused severe soil compaction and reduced earthworm biomass. Research indicates that the greatest change in soil physical properties occurs during mechanical land clearing. Agroforestry systems improved soil physical properties when cover crops and trees were included in the system.

DOI:
http://dx.doi.org/10.1016/0167-8809(95)00654-0
Altmetric score:
Dimensions Citation Count:

    Publication year

    1996

    Authors

    Alegre, J.C.; Cassel, D.K.

    Keywords

    Agroforestry, Alley cropping, Humid tropics, Land clearing, Shifting cultivation, Soil chemicophysical properties, Legumes

Related publications