Journal article Open Access

Roles of Leucaena leucocephala (Lam.) on Sandy Loam Soil pH, Organic Matter, Bulk Density, Water-Holding Capacity and Carbon Stock Under Humid Lowland Tropical Climatic Conditions

Michael, Patrick S.


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        <foaf:name>Michael, Patrick S.</foaf:name>
        <foaf:givenName>Patrick S.</foaf:givenName>
        <foaf:familyName>Michael</foaf:familyName>
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            <foaf:name>Department of Agriculture, PNG University of Technology PMB, LAE, MP 411, Papua New Guinea.</foaf:name>
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    <dct:title>Roles of Leucaena leucocephala (Lam.) on Sandy Loam Soil pH, Organic Matter, Bulk Density, Water-Holding Capacity and Carbon Stock Under Humid Lowland Tropical Climatic Conditions</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2019</dct:issued>
    <dcat:keyword>Leucaena leucocephala (Lam.), sandy loam soil, pH, bulk density, SOC, water-holding capacity, carbon stock</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-06-20</dct:issued>
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    <dct:description>&lt;p&gt;Leucaena (Leucaena leucocephala Lam.) trees planted in alley cropping or established&lt;br&gt; on fallowed farms by natural means contribute significantly to soil health and productivity by&lt;br&gt; influencing various soil properties. In this study, the effects of L. leucocephala (Lam.) on&lt;br&gt; sandy loam soil pH, organic matter content, bulk density, water-holding capacity and carbon&lt;br&gt; stock were investigated under humid lowland tropical climatic conditions in Papua New&lt;br&gt; Guinea (PNG). Soil samples were collected from 60 cm deep piths dug out from 1 m and 2 m&lt;br&gt; away from the base of the legume trees. The control soil samples were collected from&lt;br&gt; adjacent grassland dominated by Imperata cylindrica (L.), 10 m away from the legume trees.&lt;br&gt; In all the piths, soil samples were collected from the 0-20, 20-40 and 40-60 cm profiles. The&lt;br&gt; results showed presence of the legume trees acidifies the soil (lowers pH), lowers surface soil&lt;br&gt; organic carbon, improves the water holding capacity within the surface soils and helps&lt;br&gt; improve bulk density, ideal for root growth. Comparatively there was more carbon in the&lt;br&gt; surface soil of the grassland than under the legume trees. In most tropical regions, grasslands&lt;br&gt; are often set a blaze for various land uses and the high carbon content is a potent source of&lt;br&gt; CO&lt;sub&gt;2&lt;/sub&gt; emission, contributing to the greenhouse gases (GHG) in the atmosphere. The low&lt;br&gt; carbon stock measured under the legume trees means reduced emission of CO&lt;sub&gt;2&lt;/sub&gt; when burnt&lt;br&gt; and more benefits for the sandy loam soil. This study has implication for management of&lt;br&gt; sandy loam soil using L. leucocephala (Lam.) under humid lowland tropical climatic soil&lt;br&gt; conditions.&lt;/p&gt;</dct:description>
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