Surface activity of soil ecosystem engineers and soil structure in contrasted land use systems of Colombia

被引:21
作者
Decaëns, T
Asakawa, N
Galvis, JH
Thomas, RJ
Amézquita, E
机构
[1] IRD, Lab Ecol Sols Tropicaux, F-93143 Bondy, France
[2] CIAT, Soil & Plant Nutr Unit, Cali, Colombia
关键词
agroecosystems; ecosystem engineers; macroinvertebrates; savannah; soil structure;
D O I
10.1016/S1164-5563(02)01157-3
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
This study describes the impact of the conversion of native Colombian savannahs into crops and pastures on: (1) the quantity and diversity of the bio-structures produced by soil ecosystem engineers and (2) soil structure. Bio-structure diversity decreased in all agroecosystems (12 types in the savannah, four to six in pastures and three in crops). Bio-structures were mostly earthworm casts in native savannah and pastures, and ant mounds in crops. Compared with the savannah (750 cm(3) m(-2)), their volume increased in the old pasture (+48%) and decreased in recent pasture and crops (-65% to -97%). Soil structure was similar to savannah soil in the older pasture, but was sharply affected in annual crops. In contrast to crops, pastures appear to sustain soil structure and are also suitable for engineering activity. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
引用
收藏
页码:267 / 271
页数:5
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