Response of major soil decomposers to landslide disturbance in a Puerto Rican rainforest

TitleResponse of major soil decomposers to landslide disturbance in a Puerto Rican rainforest
Publication TypeJournal Article
Year of Publication2005
AuthorsLi, Y, Zou, XM, Myster, RW
JournalSoil Science Society of America Journal
Volume170
Issue3
Pagination202-211
Date Published03/2005
Accession NumberLUQ.312
Keywordstropical landslides
Abstract

To understand the relationship between soil biota and soil disturbance, 1 we sampled an upper and a lower transect within each of two landslides and their adjoining forests, during both the wet and dry season in Puerto I Rico. We found that the distribution of earthworms and soil microbes (e.g., fungi and bacteria) showed considerable spatial difference in these tropical landslides. We also found that endogenic earthworms (Poittoscolcx I corethrlrrus) occurred in all habitats (upper landslide 9.5 2 4 No. m-2, lower landslide 43.8 2 11 No. m-2, upper forest 35.7 t 8 No. m-2, and I lower forest 30.5 f 14 No. m-'), but anecic earthworms (An~yrtthas roderi- censis) were only found in the undisturbed forests (3.4 5 0.6 No. m-9). Total bacterial and fungal biomasses were significantly higher in the forests than in the landslides. Active bacterial and fungal biomasses were significantly higher in the lower landslide area than in the upper landslide area. For all sampled soil parameters there was a dominance of microsite variation within landslides compared with seasonal changes or differences between landslides and adjacent forests. Earthworm density and biomass correlated positively with leaf litter, light-carbon fraction, and total bac- teria and negatively with fine roots, suggesting that earthworm abun- dance and composition in landslides were regulated by carbon pools. Earthworm abundance and community structure as well as active and to- tal fungal and bacterial biomass may reflect soil disturbance history and soil development processes over geological time in the Puerto Rican rainforest.

DOI
eda