Effect of earthworm addition on soil nitrogen availability, microbial biomass and litter decomposition in mesocosms

被引:83
作者
Araujo, Y
Luizao, FJ
Barros, E
机构
[1] INIA Merida, Merida, Venezuela
[2] Natl Inst Res Amazonia INPA, BR-69011970 Manaus, Amazonas, Brazil
关键词
earthworms; nitrogen mineralization; litter decomposition process; Amazonia;
D O I
10.1007/s00374-003-0696-0
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The aim of the study was to determine the effect of adding two tropical earthworm species, Rhinodrilus contortus and Pontoscolex corethrurus, to mesocosms on the availability of mineral N (NH4+ and NO(3)(-)concentrations), soil microbial biomass (bio-N), and the decomposition rates of three contrasting leaf litter species, in a glasshouse experiment. The mesocosms were filled with forest soil and covered with a layer of leaf litter differing in nutritional quality: (1) Hevea brasiliensis (C/N=27); (2) Carapa guianensis (C/N=32); (3) Vismia sp., the dominant tree species in the second growth forest (control, C/N= 42); and, (4) a mixture of the former three leaf species, in equal proportions (C/N=34). At the end of the 97-day experiment, the soil mineral N concentrations, bio-N, and leaf litter weight loss were determined. Both earthworm species showed significant effects on the concentrations of soil NO3-(p<0.01) and NH4+ (p<0.05). Bio-N was always greater in the mesocosms with earthworms (especially with R. contortus) and in the mesocosms with leaf litter of H. brasiliensis (6 mug N g(-1) soil), the faster decomposing species, than in the other treatments (0.1-1.6 mug N g(-1)). Thus, earthworm activity increased soil mineral-N concentrations, possibly due to the consumption of soil microbial biomass, which can speed turnover and mineralization of microbial tissues. No significant differences in decomposition rate were found between the mesocosms with and without earthworms, suggesting that experiments lasting longer are needed to determine the effect of earthworms on litter decomposition rates.
引用
收藏
页码:146 / 152
页数:7
相关论文
共 37 条
[1]  
Anderson J. M., 1985, Ecological interactions in soil: plants, microbes and animals, P377
[2]  
ARAUJO Y, 2000, THESIS INPA UA MANAU
[3]  
ATLAVINYTE O, 1971, Annales de Zoologie Ecologie Animale, V4, P73
[4]  
BAROIS I, 1987, EARTHWORMS, P151
[5]   Effects of land-use system on the soil macrofauna in western Brazilian Amazonia [J].
Barros, E ;
Pashanasi, B ;
Constantino, R ;
Lavelle, P .
BIOLOGY AND FERTILITY OF SOILS, 2002, 35 (05) :338-347
[6]   The role of macrofauna in the transformation and reversibility of soil structure of an oxisol in the process of forest to pasture conversion [J].
Barros, E ;
Curmi, P ;
Hallaire, V ;
Chauvel, A ;
Lavelle, P .
GEODERMA, 2001, 100 (1-2) :193-213
[7]  
BARROS E, 1999, THESIS U PARIS 6
[8]  
Beck L., 1998, Proceedings of the Third SHIFT-Workshop, Manaus, Brazil, 15-19 March, 1998. A German-Brazilian Research Program., P463
[9]   Changes in soil N pools in response to earthworm population manipulations in agroecosystems with different N sources [J].
Blair, JM ;
Parmelee, RW ;
Allen, MF ;
McCartney, DA ;
Stinner, BR .
SOIL BIOLOGY & BIOCHEMISTRY, 1997, 29 (3-4) :361-367
[10]   THE PHYSICAL STRUCTURE OF CASTS OF MILLSONIA-ANOMALA (OLIGOCHAETA, MEGASCOLECIDAE) IN SHRUB SAVANNA SOILS (COTE-DIVOIRE) [J].
BLANCHART, E ;
BRUAND, A ;
LAVELLE, P .
GEODERMA, 1993, 56 (1-4) :119-132