Inorganic and organic phosphorus pools in earthworm casts (Glossoscolecidae) and a Brazilian rainforest Oxisol

We compared differences in soil phosphorus fractions between large earthworm casts (Family Glossoscolecidae) and surrounding soils, i.e., Oxisols in 10 year-old upland agroforestry system (AGR), pasture (PAS), and secondary forest (SEC) in the Central Brazilian Amazon. AGR and PAS both received low-...

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Bibliographic Details
Published in:	Soil biology & biochemistry Vol. 38; no. 3; pp. 553 - 560
Main Authors:	Kuczak, Christienne N., Fernandes, Erick C.M., Lehmann, Johannes, Rondon, Marco A., Luizão, Flavio J.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-03-2006 New York, NY Elsevier Science
Subjects:	Agroforestry Agronomy. Soil science and plant productions Amazonia Bactris gasipaes Bertholletia excelsa Biochemistry and biology Biological and medical sciences Chemical, physicochemical, biochemical and biological properties Fundamental and applied biological sciences. Psychology Glossoscolecidae Oxisol Pasture Physics, chemistry, biochemistry and biology of agricultural and forest soils Secondary forest Sequential phosphorus extraction Soil science Zoology (interactions between soil fauna and agricultural or forest soils) South America Brazil Amazon Basin America Pasture Bactris gasipaes Sequential phosphorus extraction Secondary forest Amazonia Oxisol Bertholletia excelsa Agroforestry Monocotyledones Tropical zone Rain forest Oligochaeta Earthworm Organic phosphorus Dicotyledones Angiospermae Soil science Fruit tree Sequential extraction Excreta Earthworm cast Oxisols Annelida Lecythidaceae Soils Fruit crop Spermatophyta Palmae Invertebrata
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Summary:	We compared differences in soil phosphorus fractions between large earthworm casts (Family Glossoscolecidae) and surrounding soils, i.e., Oxisols in 10 year-old upland agroforestry system (AGR), pasture (PAS), and secondary forest (SEC) in the Central Brazilian Amazon. AGR and PAS both received low-input fertilization and SEC received no fertilization. We found that earthworm casts had higher levels of organic hydroxide P than surrounding soils, whereas fertilization increased inorganic hydroxide P. Inorganic P was increased by fertilization, and organic P was increased by earthworm gut passage and/or selection of ingested materials, which increased available P (sum of resin and bicarbonate fractions) and moderately available P (sum of hydroxide and dilute acid fractions), and P fertilizer application and land-use increased available P. The use of a modified sequential P fractionation produced fewer differences between earthworm casts and soils than were expected. We suggest the use of a condensed extraction procedure with three fractions (Available P, Moderately Available P, and Resistant P) that provide an ecologically based understanding of the P availability in soil. Earthworm casts were estimated to constitute 41.0, 38.2, and 26.0 kg ha −1 of total available P stocks (sum of resin and bicarbonate fractions) in the agroforestry system, pasture, and secondary forest, respectively.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0038-0717 1879-3428
DOI:	10.1016/j.soilbio.2005.06.007